ICSE CHEMISTRY - PRACTICE PAPER 8

ICSE CHEMISTRY - PRACTICE PAPER 8

Question 

a) Select a suitable word from the list given in brackets for each of the following statements.   5M

( Ammonia, Hydroxyl ion, Nitrogen dioxide, 7, Hydronium ion, fused Lead bromide, Acetic acid)

i)        The number of electrons present in the outer most shell of a halogen.

ii)      The ion which is responsible for the acidic nature of an acid.

iii)    A strong electrolyte.

iv)    The basic gas released when Ammonium salts are heated an alkali.

v)      The acidic gas released when Nitric acid undergoes thermal decomposition.

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

Part-A

i)   The amount of energy released when

      an element gains an electron

ii)  The amount of energy required to remove an electron from its valence shell

iii) The tendency to attract bond pair of

      electrons

iv) The ease to lose electrons

v)  The element which tend to lose

      electrons

vi) Group I

Part-B

A) Electronegativity

B) Electron affinity

C) Ionisation potential

D) Non metal

E) Electropositivity

F) Metal

G) One valence electron

c) Choose the correct option from A, B, C and D for each of the following statements.            5M

i)           Which one of the following statements is suitable for the Atomic radius?

A)    Increases across a period but decreases down a group

B)    Decreases across a period but increases down a group

C)    Does not change across a period      

D)    Decreases across a period and down a group

ii)         Which one of the following is not correct about a weak electrolyte

A)    Undergoes partial dissociation                B) Conducts small amounts of electricity

C)    Contains ions and molecules                   D) Contains ions only            

iii)       Acidity of a base is defined as

A) The number of Hydronium ions produced by one molecule of the base

B) The number of Hydrogen ions produced by one molecule of an acid

C) The number of Hydroxyl ions produced per molecule of the base in its aqueous solution

D) The number of hydroxyl ions that a base contains

iv)       Ammonia gas is released when warm water is added to

A) Magnesium nitride                                        B) Sodium nitrate        

C) Ammonium nitrtate                                       D) Calcium hydroxide

v)         Conc. HNO₃ is a strong __________ agent.

A)    Oxidising                   B) drying                        C) reducing              D) dehydrating

d) Fill in the blanks:-                                                                                                                     5M

i)        Metals have ________(low/high) ionization potential values.

ii)      Strong acids dissociate ______________( completely/partially)tom give a high concentration of Hydronium ions in their aqueous solutions.

iii)    _______________ (Electrorefining / electroplating) makes an article attractive.

iv)    Aqueous solution of Ammonia is called ______________ (liquor/ liquid) ammonia.

v)      Nitric acid is a _______________(non-volatile/ volatile) acid.