Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 81 - 85 of 142

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Question number: 81

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

AgNO3(aq)+NaCl(aq)AgCl(aq)+NaNO3(aq) .

It is an example of

Choices

Choice (4) Response

a.

decomposition reaction

b.

displacement reaction

c.

double displacement reaction

d.

redox reaction

Question number: 82

» Chemistry » Carbon and Its Compounds

MCQ▾

Question

Which of the following forms of coal has the lowest percentage of carbon?

Choices

Choice (4) Response

a.

Anthracite

b.

Peat

c.

Bituminous

d.

Lignite

Question number: 83

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

When ethanol is heated with cone H2SO4 at a temperature of 170°C, it gets converted into ethane acid. In this reaction cone H2SO4 plays a role of

Choices

Choice (4) Response

a.

oxidizing agent

b.

dehydrating agent

c.

reducing agent

d.

catalyst

Question number: 84

» Chemistry » Structure of Atom

MCQ▾

Question

Consider the flowing statements

I. On moving from left to right in period atomic radii increases.

II. On moving from left to right in period atomic radii decreases. Which of the above statement (s) is/are correct?

Choices

Choice (4) Response

a.

Only II

b.

I and II

c.

Only I

d.

None of the above

Question number: 85

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

10 mL of dilute acetic acid was added to 10 mL of water and this mixture was shaken for a minute. It was observed that

Choices

Choice (4) Response

a.

water formed a separate layer at the bottom

b.

a clear solution was formed

c.

the acid formed a separate layer at the bottom

d.

the turbidity appeared in the test tube

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