Chemistry (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 3 of 63

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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 » Structure of Atom

Appeared in Year: 2013

MCQ▾

Question

Which of the following is a suitable example for illustrating the law of conservation of mass? (atomic mass of O = 16, H = 1)

Choices

Choice (4) Response

a.

18 g of water freezes at 4°C to give same mass of ice

b.

18 g of water is completely converted into vapour state on heating

c.

18 g of water in liquid state is obtained by heating 18 g of ice

d.

18 g of water is formed by the combination of 16 g oxygen with 2 g of hydrogen

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