Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 23 - 26 of 26

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Question number: 23

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Two elements A and B on burning in air give corresponding oxides. Oxides of both A and B are soluble in water. The aqueous solution of oxide of A is alkaline and reacts with aqueous solution of oxide of B to give another compound. Identify A and B.

Choices

Choice (4) Response

a.

A is non-metal and B is metal

b.

A and B both are metals

c.

A and B both are non-metals

d.

A is metal and B is non-metal

Question number: 24

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The necessary conditions for combustion process to occur are

I. availability of air/oxygen.

II. availability of air/oxygen and fuel.

III. temperature of fuel below ignition temperature.

IV. temperature of fuel above ignition temperature.

Select the correct alternative.

Choices

Choice (4) Response

a.

I and II

b.

II and IV

c.

IV and I

d.

III and I

Question number: 25

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

On electrolysis of brine solution, the products formed are

Choices

Choice (4) Response

a.

hydrogen, chlorine and sodium hydroxide

b.

sodium hydroxide, chlorine and oxygen

c.

sodium and chlorine

d.

hydrogen, chlorine and oxygen

Question number: 26

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The milkiness produced on passing CO2 gas through limewater is due to formation of

Choices

Choice (4) Response

a.

calcium carbide

b.

calcium oxide

c.

calcium carbonate

d.

calcium bicarbonate

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