CLASS 10 ICSE CHEMISTRY PRACTICE PAPER-5

PERIODOC TABLE, HCl, ACIDS, BASES , NITRIC ACID and  PRACTICAL CHEMISTRY

Section I (40 Marks)

Answer all the questions

Question 1

a) Choose the suitable word to fill in the blanks.                                                                       5M

(Electron affinity, descreases, increases, valence, Ionisation potential, electron)

_______(i)_______ is the amount of energy required to remove one ____(ii)______ from the valence shell of an isolated gaseous atom. This property _____(iii)____ across a period from left to right due to the ______(iv)______ nuclear attraction force on the __(v)____ electrons.

b)   Match the following.                Example-   vi-G                                                                   5M

Part-A

i)   An alkali metal

ii)  The element with highest E.A value

iii) The element with highest E.N value

iv) An organic acid

v)  Acid used in eye wash

vi) A strong acid

Part-B

A) Chlorine

B) Acetic acid

C) Boric acid

D) Sodium

E) Fluorine

F) Calcium

G) Sulphuric acid

c) Select the correct answers from the words given below:                                                     10M

i)           The number of valence electrons present in an alkali metal is:

A) 1                                 B) 2                                C) 3                          D) 4

ii)         The noble gas which belongs to period 2 is:

A)Helium                        B) Argon                        C) Krypton               D) Neon

iii)       The elements with stable electronic configuration:

A) Alkali metals              B) Alkaline earth metals   C) Halogens          D) Inert gases

iv)       The basicity of Hydrochloric acid

A) 4                                 B) 2                                C) 1                          D) 3

v)         The gas which has rotten egg smell

A) H₂S                             B) HCl                           C) Cl₂                       D) SO₂

vi)       Which of the following statements is not true:

A) Carbon belongs to period 2

B) Helium is not a halogen

C) Oxygen has two valence electrons

D) Calcium is an alkaline earth metal

vii)     An used in food preservation

A) Tartaric acid               B) Citric acid                 C) Carbonic acid      D) Boric acid

viii)   The gas which turns lime water milky but has no effect on acidified K₂Cr₂O₇ :

A) H₂                               B) SO₂                            C) CO₂                     D) Cl₂

ix)       The gas released when a dil. acid is added to an active metal:

A) Hydrogen                   B) Oxygen                     C) Chlorine              D) Fluorine

x)         Which of the following is not an oxy acid:

A) HNO₃                         B) H₂SO₄                       C) HCl                     D) H₂SO₃

d) Fill in the blanks:-                                                                                                                  5M

i)        A metal is an element which _______________(loses/gains) electrons.

ii)      Atomic radius ________________(increases/decreases) across a period from left to right.

iii)    _______________(Noble gases/Halogens) do not lose or gain electrons.

iv)    HCl is a/an __________________( covalent/electrovalent) compound.

v)      Hydrogen chloride gas reacts with Iron to form _____________(FeCl₂/FeCl₃).

e) Correct the following statements and rewrite.                                                                      5M

i) Physical and chemical properties of the elements are the periodic functions of their atomic weights.

ii) Metallic nature of the elements increases from left to right across a period.

iii) Hydrochloric acid is a weak acid.

iv) Hydrogen ions are responsible for the acidic nature of an acid.

v) Bases turn blue litmus to red.

f) Name the following.                                                                                                             5M

i) The first element of the Periodic Table.

ii) The horizontal rows in the Periodic table are given this term.

iii) The distance between the centre of the nucleus of atom and its valence shell.

iv)A non volatile acid.

v) The metal which golden yellow flame in flame test.

g) Study the given table and answer the questions given below.                                             5M

Atomic No.	3	4	5	6	7	8	9	10	11	12
Element	A	B	C	D	F	G	H	I	J	K

i)        The element which contains 3 valence electrons.

ii)      The element electronic configuration 2,6.

iii)    The element which belongs to Halogen group.

iv)    An alkali metal.

v)      A noble gas.

Section II (40 Marks)

Answer any four of the following questions

Question 2                                                                                                                         2+2+2+4

a)      Arrange the following elements according to the description given in brackets.

i)        K, Na, Li, Cs( decreasing order  of their atomic radius)

ii)      Mg, Na, Al, Cl, S (increasing order of their Electronegativity)

b)      State how the following periodic properties change across a period from left to right

i)        Electronegativity                               ii) Electron affinity

c)      i) Metals are electropositive/electronegative.

ii) Alkaline earth metals are monovalent/ divalent.

d) Study the following table and answer the questions given below.

Group No.à	IA 1	IIA 2	IIIA 13	IVA 14	VA 15	VIA 16	VIIA 17	VIIIA 18
Period No.
2	A		D			F	Y
3		B			E			T
4			G			Q	P

i)  Identify the Noble gas from the given table.

ii)      What type of bond is formed between A and Q?

iii)    State the formula of the compound formed between B and Y.

iv)    The formula of a compound formed between X and P is XP₃ then write the formula of the oxide formed by the element X.

Question 3                                                                                                                         2+3+3+2

a)      i) Give the balanced equation for the preparation of Hydrogen chloride gas in the laboratory with the conditions required.

ii) State the identification test for Hydrogen chloride gas.

b)      Give reason why :

i) HCl gas is dried using Conc. Sulphuric acid but not using quick lime.

ii) The temperature should be maintained below 200⁰C in the preparation of HCl in the above process.

iii) Hydrogen chloride gas is not collect over water.

c)      Study the diagram and answer the following questions.

i) Identify the gas X taken in the round bottom flask.

ii) Which property of X is proved in the experiment?

iii) State the colour change seen when solution Y enters the round bottom flask.

d)     i) Hydrogen chloride gas is heavier/lighter than air.

ii) Name the catalyst used in the given reaction.        H₂ + Cl₂ à 2HCl

Question 4                                                                                                                             2+3+5

a)      Define the following terms

i) Acid                         ii) Basicity of an acid

b)      Complete and balanced equations:

i)     CO₂ + H₂O à

ii)   SO₃ + H₂O à

iii)    S + HNO₃ à

c)      i) State any two uses of acids.

ii) Give any two examples of oxyacids.

iii) Strong acids dissociate completely/partially to a high concentration of hydronium ions.

Question 5                                                                                                                         3+3+2+2

a) i) Conc. HNO₃ is a/an ______________ (reducing/oxidizing) agent.

ii) Give balanced equation for the decomposition of Conc . Nitric acid on heating.

iii)State the observation seen when Conc. Nitric acid is heated.

b) i) Name the gas produced when conc. Nitric acid is added to Copper.

ii) Nitric acid prepared in the laboratory appears in yellowish brown. Why?

iii) Conc. HNO₃ oxidises Sulphur to _____________( Sulphuric/sulphurous) acid.

c) i)What is the significance of Conc. HNO₃ mixed with conc. HCl in the ratio 1:3?

ii) Nitric acid is a ______________( volatlie/non volatile) acid.

d) Give reason why:

i) Apparatus used in the preparation of Nitric acid is made of Glass only.

ii) Conc. HCl is not used instead of Conc.H₂SO₄ in the laboratory preparation of Nitric acid.

Question 6                                                                                                                             5+3+2

a) Select the suitable option for following descriptions.

(Hydrogen suphide, Nitrogen dioxide, Oxygen, Potassium dichromate, Ammonia gas, Sulphur dioxide)

i) The gas which turns alkaline Pyrogallol to brown.

ii) The orange colour solution which turns to clear green on passage of Sulphur dioxide through it.

iii) A greenish yellow colour gas with pungent odour.

iv) A gas which turns Nessler’s reagent to brown.

v) Lead acetate gives Silvery black precipitate with this gas.

b)  State the observations seen when Ammonium hydroxide solution is added to the salts containing following cations:

i) Cu²⁺                    ii) Fe²⁺                         iii) Ca²⁺

c) Sate the nature of the following gases in terms of acidic/basic.

i) Ammonia                                     ii) Nitrogen dioxide

Question7                                                                                                                           4+4+2

a)      i) State the significance of special funnel arrangement in preparation of Hydrochloric acid from Hydrogen chloride gas.

ii) Name the gas released when dil. HCl reacts with sodium sulphite solution.

iii) State the observation seen in the following reaction.

CuS + 2HCl à CuCl₂ + H₂S

iv) Mention any one industrial use of Hydrochloric acid.

b)      Write balanced equations for the following conversions:

i)        dil HCl à ZnCl₂

ii)      dil. HCl à H₂S

iii)    Pb(NO₃)₂ àPbCl₂

iv)    MnO₂ àCl₂

c)      State the observations seen when:

i) Conc. HCl is heated with Pb₃O₄

ii) dil. HCl is added to Sodium carbonate.

Question 8

a)      i) dil.HCl turns blue litmus to ______________.                                                        4+4+2

ii) State the colour of Nitrogen dioxide.

iii) Write the electronic configuration Carbon.

iv) An element X has 2 electrons in its valence shell. Is it a metal or nonmetal?

b)      Correct the following statements and rewrite.

i) HNO₃ is an organic acid.

ii) A monobasic acid gives two Hydronium ions in its aqueous solution.

c)      i) Metal oxides dissolve in water to produce bases/acids.

ii) The basicity of a dibasic acid is _________.

iii) Citric acid is an inorganic/organic acid.

iv) Organic acids are strong/weak acids.