Chemistry-Physical and Chemical Changes (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 27 - 31 of 42

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Question number: 27

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

A student took five test tubes containing solutions of different colors marked I, II, III, IV and V as shown below. The test tubes containing copper sulphate and ferrous sulphate solution could be the tubes

Five test tubes containing different colors

Five Test Tubes Containing Different Colors

Find the test tube containing copper sulphate and ferrous sulphate

Choices

Choice (4) Response
a.

Ill and V

b.

I and V

c.

II and IV

d.

IV and V

Question number: 28

» 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: 29

» 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

Question number: 30

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Which of the following is an exothermic reaction?

Choices

Choice (4) Response
a.

Respiration

b.

Electrolysis of water

c.

Conversion of limestone into quicklime

d.

Photosynthesis

Question number: 31

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Ankit while heating solid lead nitrate taken in a test-tube, observed

Choices

Choice (4) Response
a.

brown residue of NO

b.

green residue of NO2

c.

yellow residue of PbO

d.

white residue to PbO2

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