Page 2 - HOME ASSIGNMENT-1 (OBJECTIVE & SUBJECTIVE QUESTION)

SUBJECTIVE-

S.L Questions Mark Skill
No.
Q.1 What happens when basic oxides, like, Na2O or K2O are 1 R
dissolved in water? Write balanced chemical equation.
Q.2 State T/F: 1 u

When a base reacts with a metal, along with the evolution of
hydrogen gas a salt is formed which has a positive ion composed
of the metal and oxygen.
Q.3 (i) Name the gas which is liberated when an acid reacts with a 3 R+A
metal? How will you test the presence of this gas?

(ii) Write the chemical equation for the reaction of zinc metal with

(a) hydrochloric acid and (b) with sodium hydroxide.
Write the chemical name of salt obtained in each case.

(iii)Identify the acid and base for ammonium chloride salt. What
would be the nature of this salt? Mention the pH range of this salt.

Q.4 State reason for the following: 3 U+A

(i) Acids do not show acidic behaviour in the absence of water
but aqueous solution of an acid conducts electricity.

(ii) Distilled water does not conduct electricity whereas rain
water does.

(iii) Pickles and other sour food stuffs should not be kept in
copper and brass vessels.

Q.5 In an activity to investigate whether all compounds containing 5 HOT

hydrogen are acidic.

(a) Draw a well labelled experimental set – up for the activity –

(b) State what is observed giving reasons for the following when:

(i) Current is passed through dilute hydrochloric acid in the beaker.

(ii) Current is passed through glucose and alcohol solutions in the
beaker.

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