ICSE CLASS 10 ELECTROLYSIS Multiple Choice Questions - MCQs for Practice

ICSE CHEMISTRY ELECTROLYSIS Multiple Choice Questions

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Electrolysis MCQs - ICSE CHEMISTRY

Choose the correct answer from A, B, C and D for each of the following statements.

Question 1

The presence of the following is mandatory for the conduction of electric current though an electrolyte:

A) electrons

B) ions

C) molecules

D) free ions

 

Question 2

Which of the following statements is true about a strong electrolyte?

A) undergoes partial dissociation

B) undergoes complete dissociation

C) does not undergo dissociation

D) does not conduct electricity in its aqueous solution

 

Question 3

Arrange these cations in the decreasing order of their tendency to get reduced Mg²⁺, Cu²⁺, Ag¹⁺, Zn²⁺

A) Mg²⁺ > Cu²⁺ > Ag¹⁺ > Zn²⁺

B) Mg²⁺ > Zn²⁺> Cu²⁺  > Ag¹⁺

C) Ag¹⁺ >  Cu²⁺ > Zn²⁺ > Mg²⁺  

D) Ag¹⁺ <  Cu²⁺ < Zn²⁺ < Mg²⁺  

 

Question 4

An example of inert electrode

i) Graphite

ii) Nickel

iii) Silver

iv) Copper

 

 

Question 5

The selective discharge of ions does not depend on

A) concentration of ions

B) position of the ion in the electro-chemical series

C) electrolyte

D) nature of the electrode

 

Question 6

Which of the following ions is called a spectator ion?

A) Chloride ion

B) hydroxide ion

C) sulphate ion

D) Bromide ion

 

Question 7

The anode used in the electrolysis of fused Lead bromide

A) Iron

B) Graphite

C) Copper
D) Silver

 

 

Question 8

The electrolyte added to water during the  electrolysis of water:

A) dil. Hydrochloric acid

B) dil. Sulphuric acid

C) dilute Nitric acid

D) Conc. HCl

 

Question 9

When acidified water is electrolysed using platinum electrodes ________ gas is released at cathode and __________ gas at  anode in the ratio _______ by volume.

A)    Oxygen, Hydrogen, 2:1

B)    Hydrogen, Oxygen, 1:2

C)    Hydrogen, Oxygen, 2:1

D)    Oxygen, Hydrogen, 1:2

 

Question10

 Which of the following statements is not true about the cathode in electrolysis process?

A) Reduction electrode

B) attracts cations
C) accepts electrons from cation

D) donates electrons to cation

 

Question 11

A weak electrolyte:

 

A) Fused Lead bromide

B) Aqueous solution of Sodium chloride

C) dilute Acetic acid

D) Sugar solution

 

Question 12

During electrolysis of Copper sulphate solution using Copper electrodes

i) blue colour of the solution fades

ii) pinkish brown coating on cathode

iii) anode diminishes in size

iv) cations discharged at cathode are replaced by anode

 

A) i) only correct

B) i) and ii) are correct

C) ii) and iii) are correct

D) i) is incorrect and rest all are correct

 

Question 13

The ions present in acidified water during electrolysis:

A) H⁺ , OH^1-

B) H¹⁺, OH^1- and SO₄^2-

C) H¹⁺ and SO₄^2-

D) H⁺ only

 

Question 14

The ion which gets discharged at cathode during the electrolysis of Conc. Sodium chloride:

A) Sodium ion

B) Hydrogen ion

C) Chloride ion

D) Hydroxyl ion

 

Question 15

During electro-refining a metal that the anode is made of:

A) pure block of the metal

B) impure block of the metal

C) impure sheet of the metal

D) pure sheet of the metal

 

Question 16

Anode reaction in electrolysis of Copper sulphate solution using  Copper electrodes:

A) Cu²⁺ + 2e^- à Cu

B) 2H⁺ + 2e^- à H₂

C) Cu – 2e^- à Cu²⁺

D) 4OH^- - 4e^- à O₂ + 2H₂O

 

Question 17

Which of the following compounds can conduct large amounts of electric current through their aqueous solutions?

A) Sodium chloride

B) Ammonium hydroxide

C) Alcohol

D) Sodium bicarbonate

 

Question 18

The electrolyte preferred in the electroplating an article with Silver

A) Silver chloride

B) Sodium Argento (Silver) Cyanide

C) Silver nitrate

D) Silver sulphate

 

Question 19

During electrolysis process the electrons lost by the cathode is ________  the electrons gained by the anode.

A) equal to

B) less than

C) greater than

D) independent of

 

Question 20

Electroplating is the process in which an _______ metal is coated on a __________ metal.

A) inert, expensive

B) expensive, baser

C) baser, inert

D) active, inert

Practical Chemistry CLASS 10 Questions on Identification of Anion

Identification of Anion - ICSE CHEMISTRY CLASS 10

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Here are some practice questions for your self test. It can be used for a quick revision test o Identification of anions from practical chemistry For ICSE class 10 students.

a) Identify the anion present in the given salt in each of the following cases.

1. This salt when treated with a dilute acid gives effervescence of a colourless gas which turns lime water milky but has no effect on acidified Potassium permanganate.

2. A salt which produces a colourless gas when a dilute acid is added and that gas turns acidified Potassium dichromate to clear green solution.

3. A salt on thermal decomposition gives a reddish brown fumes and these fumes give violet vapours with Potassium iodide crystals.

4. This salt solution gives a white precipitate with Silver nitrate solution which dissolves in excess Ammonium hydroxide.

5. This salt solution gives a white precipitate with Barium chloride solution and the precipitate is insoluble in dilute acid.

6. This salt solution on treating with freshly prepared Ferrous sulphate followed by Conc. Sulphuric acid drops added alongside of test tube walls, gives a brown ring at the junction of two liquids.

b) Differentiate between the following pairs of salts:

1. Sulphate salt and Sulphite salt using Barium chloride solution

2. Sulphite salt and Carbonate salt using a dilute and acidified Potassium permanganate.

Answers:

a) 

1. Carbonate ion

2. Sulphite ion 

3. Nitrate ion

4. Chloride ion

5. Sulphate ion

6. Nitrate ion

b) 

1. A salt containing Sulphate ion gives a white precipitate with Barium chloride which is insoluble in a dilute acid but the salt containing Sulphite ion gives a white precipitate which dissolves in a dilute acid.

2. A sulphite salt gives a colourless gas which turns lime water milky and decolourises acidified Potassium permaganate. where as a carbonate salt with a dilute acid gives a colorless gas which turns lime water milky but has no effect on acidified Potassium permanganate.

Metallurgy Test

Electrolysis Test

Chemical Bonding - test

The Periodic Table

Practical Chemistry Test - anions

Practical Chemistry Test - Cations

Practical Chemistry Test - Observation Based

Sureshot questions in ICSE CHEMISTRY

Chemical Bonding quick revision Test - Class 10 ICSE CHEMISTRY

CHEMICAL BONDING - REVISION TEST - CLASS 10 ICSE

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The following question are from Chemical Bonding Class 10 ICSE CHEMISTRY. You can use this as a quick revision test.

a) Name the following.

1. The chemical bonding in which electron pairs are mutually shared between the atoms and both atoms contribute equal number of electrons.

2. The electrostatic force of attraction which holds two oppositely charged ions together.

3. The covalent bond in which shared pair of electron comes from the same atom.

4. The covalent bond in which the shared pair of electrons is not distributed equally between the atoms in the bonding.

5. A covalent molecule which contains triple bond between a pair identical atoms.

6. A polar covalent compound in which the central atom carries two lone pairs of electrons.

7. The metal  which loses two electrons and achieves the stable electronic configuration of Argon.

8. These compounds contain molecules only.

9. The element which has one valence electron but forms polar covalent compounds with non-metals.

10. A polar covalent compound which behaves like an ionic compound when dissolved in water.

b) Give Reason.

1. Elements with unstable electronic configuration participate in the formation of molecules/ compounds.

2. Ionic compounds conduct electricity in fused state or aqueous solutions but not in solid state.

3. Ionic compounds have high B.P and M.P but covalent compounds have low B.P and M.P.

4. Hydrogen chloride dissolves in water but Carbon tetra chloride does not dissolve on water.

c) 

1. Two elements A and B have 1 and 2 valence electrons respectively. If the element B contains diatomic molecules write balanced equation for the combination reaction between A and B.

2. Draw electron dot representation of:

i) Ammonia Molecule        ii) Hydronium ion 

Answers

a)

1. Covalent bond

2. Ionic/ Electrovalent bond

3.Coordinate covalent bond

4. Polar Covalent bond

5. Nitrogen

6. Ammonia

7. Calcium

8. Covalent compounds

9. Hydrogen

10. Hydrogen chloride

b)

1. Elements participate in bond formation to attain stable electronic configuration.

2. Ionic compounds in solid state does not contain free ions but in their fused state or aqueous solutions they contain free ions and conduct electricity.

3. Ions inn the ionic compounds are held with strong electrostatic force of attraction but covalent molecules are held with weak Van der waal's force of attraction.

4. Hydrogen chloride is a polar compound so dissolves polar solvent like water but Carbon tetra chloride is a non-polar compound

c)

1. 4A + B₂  --> 2A₂B

2. i) Ammonia molecule

ii) Hydronium ion

The Periodic Table Quick Revision Test - ICSE CHEMISTRY

The Periodic Table Class 10 Practice Questions for Board Exam 2021 - Quick Revision Test

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Name the following.

1. The element which the most Electro-negativity in nature.

Ans: Fluorine

2. The element which has highest Electron Affinity value.

Ans: Chlorine

3. The metalloid present in Period 3 of the Periodic Table.

Ans: Silicon

4. The element present in Period 3 with 3 valence electrons.

Ans: Aluminium

5. The noble gas which does not have octet configuration.

Ans: Helium

State/ Give one term for the following statements.

1. The tendency of an element to attract electrons to itself when in combined state.

Ans: Electro-negativity

2. The minimum amount of energy to be supplied to an isolated gaseous atom of an element to remove one valence electron.

Ans: Ionization Potential

3. The amount of energy released when an atom of an element accepts one electron into its valence shell.

Ans: Electron affinity

4. The tendency to lose electrons easily.

Ans: Metallic character

Give reason:

1. Atomic radius decreases across a period.

Ans: The nuclear charge increases across the period but the number of shells remain same. Hence the nuclear pull increases on the valence shell which causes decrease in Atomic radius (Atomic size).

2. Electro-negativity increases across a period.

Ans: The nuclear pull increases on the valence electrons hence Electronegativity increases.

3. Metallic character increases down a Group.

Ans: The number of shells increases down the group which predominates the nuclear pull on the valence electrons. Hence the atoms loses the valence electrons readily and its metallic  character increases.

State how :

1. Electron Affinity changes across a period.

Ans: Electron Affinity increases across a period.

2. Ionization Potential  (I.P) changes down the Group.

Ans: I.P decreases down the group.

Arrange the following set of elements as described in brackets.

1. Mg, Na, Cl, P (Increasing order of Electro-negativity)

Ans: Na, Mg, P, Cl

2. Br, Cl, I, F (decreasing order of E.A)

Ans: Cl, F, Br, I

3. Ba, Be, Mg, Ca (decreasing order of Metallic character)

Ans: Ba, Ca, Mg, Be

Study the table given and answer the questions given below

Atomic No.	3	4	5	6	7	8	9	10
Element	A	B	C	D	E	F	G	H

1. Which of these elements belong to Group 2 ? 

2. Which of the above elements has stable electronic configuration?

3. State the group number that the element D belongs to.

4. Which atomic number belongs to Alkali metals?

5. Identify the metalloid.

6. What is the valency exhibited by the element 'G'.

7. Write the formula of the oxide of the element 'A'.

Observation based questions - Practical chemistry 2

Questions on Analytical chemistry 

Identification of cations using Ammonium hydroxide and Sodium hydroxide

Identify the cation present in each of the following cases based on the colour of the precipitate formed.

1. A salt solution gives a gelatinous white precipitate with small amount of Ammonium hydroxide, and the precipitate is soluble in excess Ammonium hydroxide.

Ans: Zinc ion

2. A salt solution forms a reddish brown precipitate with Ammonium hydroxide which remains insoluble.

Ans:  Ferric ion

3. This salt solution gives a pale blue precipitate with Ammonium hydroxide, this precipitate turns deep (inky) blue solution in excess Ammonium hydroxide.

Ans: Cupric ion

4. When Ammonium hydroxide is added to this salt solution a dirty green precipitate is formed whih is isoluble in excess Ammonium hydroxide.

Ans: Ferrous ion

5. When this salt solution is treated with Ammonium hydroxide solution a white precipitate is formed and insoluble in excess Ammonium hydroxide.

Ans: Lead ion

6. A salt solution is treated with Sodium hydroxide then it gives a gelatinous white precipitate and that white precipitate disappears when excess Sodium hydroxide is added.

Ans: Zinc ion

7. When Sodium hydroxide solution is added to a salt solution, a pale blue precipitate is formed which remains insoluble in excess Sodium hydroxide.

Ans: Zinc ion

8. Two salt solutions A and B are treated with Sodium hydroxide and A reddish brown precipitate and a dirty green precipitate are formed respectively.

Ans: Solution 'A' contains Ferric ion

Solution 'B' contains Ferrous ion

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Class 10 ICSE Important questions ORGANIC CHEMISTRY - 3

ORGANIC CHEMISTRY - 3

Give a suitable term for the following.

1.      Displacement of Hydrogen atoms of a hydrocarbon by another atom.

2.      Elimination of Carbon dioxide from a carboxylic acid.

3.      Methyl iodide reacts with Sodium in presence of dry ether to produce Ethane.

4.      Methane reacts with Chlorine in UV light to produce Carbon tetra chloride.

5.      Elimination of the elements of water from Ethyl alcohol to produce Ethene.

6.      The reaction which involves removal Hydrogen halide.

7.      Conversion of unsaturated Hydrocarbons to saturated hydrocarbons.

8.      Simple molecules join to form large molecules.

9.      The reaction between Ethyl alcohol and Acetic acid to give Ethyl acetate.

10.  Preparation of Ethane from Ethyl acetate.

11.  Conversion of Ethane to Ethyl chloride.

12.  Methane in presence of Potassium dichromate gives Methanol.

13.  Ethyl alcohol on heating with Conc. Sulphuric acid gives Ethene.

14.  Ethyl chloride on boiling with alcoholic Potassium hydroxide gives Ethane.

15.  Ethene is converted to Ethane in presence of Nickel.

16.  Preparation of 1,1,2,2-tetra chloro Ethane from Ethyne.

17.  Alkyl halides on boiling with aqueous solution an alkali gives alcohols.

18.  Conversion of Carbohydrates to Ethyl  alcohol in presence of Enzymes.

19.  Condensation of an alcohol with a Carboxylic acid producing esters.

20.  The reaction in which Hydrogen atoms are replaced by halogen atoms.

Class 10 ICSE - ORGANIC CHEMISTRY - 1

ORGANIC CHEMISTRY - Important questions - 1

Name the following.

1.         The tetravalent non-metal which shows Catenation.

2.         The property of organic compounds having same molecular formula but different structural formula.

3.         A series of organic compounds where the successive members of that series follow a regular structural pattern.

4.         The hydrocarbons containing Carbon-Carbon multiple bond/s.

5.         The isomerism shown by the compounds differ in the arrangement of Carbon atoms in the chain.

6.         The functional group which is indicated by the secondary suffix ‘-oic acid’.

7.          Alkenes undergo this type of reactions.

8.         Theses organic compounds undergo substitution reactions.

9.         These compounds are also called as paraffins.

10.     The compound in which one Carbon atom is joined to four Hydrogen atoms by single covalent bonds.

11.     The gas produced when sodium propionate is heated with Soda lime.

12.     The gas produced when Sodium ethanoate is heated with Soda lime.

13.     The alkane obtained when Methyl iodide is reduced in presence of Zn/Cu couple.

14.     The reaction which is not suitable for the preparation of alkanes having even number of Carbons atoms.

15.     A hydrocarbon which contributes towards Green House Effect.

16.     The product formed in the step 3 of Chlorination of Methane.

17.     The product obtained in the final step of Chlorination of Methane.

18.     The gas produced when an Alkane burns in presence of sufficient Oxygen.

19.     The product obtained by the oxidation of Methane in a red hot Copper tube.

20.     The product formed when Methane is oxidized in presence of MoO as a catalyst.

21.     A Hydrocarbon used in the Manufacture of Carbon black used as a pigment in shoe polish.

22.     The hydrocarbons containing olefenic bond.

23.     The dehydrating agent used to prepare Ethene from Ethyl alcohol.

24.     The alkene produced when Ethyl alcohol is heated with Conc. Sulphuric acid at 170⁰C.

25.     The alkaline solution used to purify Ethane prepared from Ethyl alcohol.

26.     Dehydrogenation of Ethyl bromide in presence of this compound gives Ethene.

27.     An alkene which has a pleasant smell.

28.     The catalyst used in the hydrogenation of alkenes.

29.     The compound which is produced by dehydrohalogenation of Ethyl bromide and decolourises Bromine water.

30.     The alkene used in the artificial ripening of fruits and welding purposes.

ICSE CLASS 10 CHEMISTRY PRACTICE PAPER 19

ICSE Class 10 - PRACTICE PAPER 19

PERCENTAGE COMPOSITION

(at.wt. H-1, C-12, N-14, O-16, Na-23, Mg-24, P-31, S-32, Cl-35.5, K-39, Ca-40, Cr-52, Fe-56, Cu-64, Zn-65, Br-80, Pb-207)

1.      A compound is found to contain 23.3% magnesium, 30.7% sulfur and 46.0% oxygen. What is the empirical formula of this compound?

2.      Find the empirical formula and molecular formula a compound containing 38.8% carbon, 16.2% hydrogen and 45.1% nitrogen? V.D of the compound =31.

3.      A has the empirical formula X₂Y. If the atomic weights of X and Y are 10 and 5 respectively and vapour density of the compound is 25 then find its molecular formula.

4.      A metal M forms a volatile chloride containing 65.5% of Chlorine. If the density of that chloride relative to Hydrogen is 162.5 (i.e. V.D) then find its empirical formula and molecular formula.

5.      Find the percentage of i) water and ii) Oxygen in hydrated Copper sulphate.

6.      If  30g of a Hydrocarbon has 24g of Carbon combined with Hydrogen then find its empirical formula and molecular formula.

7.      A gaseous compound of Nitrogen and Hydrogen contains 12.5% of Hydrogen by mass. Find the molecular formula of the compound if its relative molecular mass (Molecular wt.) is 32.