Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 3 of 26

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Question number: 1

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

There is a mixture of three solid compounds A, B and C. Out of these compounds A and C are soluble in water and compound C is sublimable also. In what sequence the following techniques can be used for their effective separation?

I. Filtration

II. Sublimation

III. Crystallisation from water extract

IV. Dissolution in water

Choices

Choice (4) Response
a.

l, II, III and IV

b.

IV, I, II and III

c.

II, IV, I and III

d.

I, II, IV and III

Question number: 2

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

A compound X is obtained by the reaction of alkaline KMnO3 with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of H2SO4 to form a sweet smelling compound Z. The compound X, Y and Z are respectively.

Choices

Choice (4) Response
a.

Ethanoic acid, ethanol, ethyl ethanoate

b.

Ethanoic acid, ethanal, ethane

c.

Ethanol, Ethanoic acid, sodium ethanoate

d.

Ethanol, ethane, ethanoic acid

Question number: 3

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colorless gas Z. The reactions are highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0 the compounds X, Y and Z respectively are

Choices

Choice (4) Response
a.

Na,NaOHandH2

b.

Ag,AgOHandH2

c.

Al,AI(OH)3andH2

d.

K,KCIandH2

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