Chemistry-Physical and Chemical Changes (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 21 - 25 of 26

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Question number: 21

» 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: 22

» 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: 23

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

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

Choices

Choice (4) Response

a.

calcium carbide

b.

calcium oxide

c.

calcium carbonate

d.

calcium bicarbonate

Question number: 24

» Chemistry » Physical and Chemical Changes

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.

I, II, IV and III

b.

II, IV, I and III

c.

IV, I, II and III

d.

I, II, III and IV

Question number: 25

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

An element X combines with hydrogen to form a compound Equation . The element X is placed on the right side of the periodic table. What is true about the element X?

I. Has valence electrons.

II. Is a metal and is solid.

III. Is a non-mental and is a gas.

IV. Has a 5 valence electrons E

V. Equation reacts with water to form a basic compound.

Choices

Choice (4) Response

a.

V, I and II

b.

I, II and III

c.

III, IV and V

d.

II, III and IV

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