NSTSE (National Science Talent Search Exam- Unified Council) Class 8: Questions 1942 - 1949 of 2028

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Question number: 1942

» Chemistry » Metals and Non-Metals

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MCQ▾

Question

Noble gases are said to be inert, because they have________ electron in their valency shell?

Choices

Choice (4) Response

a.

8

b.

1

c.

6

d.

3

Question number: 1943

» Chemistry » Metals and Non-Metals

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MCQ▾

Question

Which of the following element can replace magnesium from its salt?

Choices

Choice (4) Response

a.

Calcium

b.

Zinc

c.

Iron

d.

Aluminium

Question number: 1944

» Chemistry » Metals and Non-Metals

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MCQ▾

Question

In which of the following alloys, - Copper is a component?

Choices

Choice (4) Response

a.

Nichrome

b.

Bronze

c.

Steel

d.

Solder

Question number: 1945

» Chemistry » Combustion and Flame

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MCQ▾

Question

Which of the following can cause acid rains?

Choices

Choice (4) Response

a.

Carbon monoxide

b.

Carbon dioxide

c.

Sulphur oxides and nitrogen oxides

d.

Deforestation

Question number: 1946

» Chemistry » Combustion and Flame

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MCQ▾

Question

What are the products formed in foam type fire extinguished?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1947

» Chemistry » Metals and Non-Metals

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MCQ▾

Question

How many number of electrons present in Valence shell of metals generally?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1948

» Chemistry » Combustion and Flame

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MCQ▾

Question

What type of reaction is “combustion”?

Choices

Choice (4) Response

a.

Displacement reaction

b.

Reduction reaction

c.

Exothermic reaction

d.

Endothermic reaction

Question number: 1949

» Chemistry » Metals and Non-Metals

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MCQ▾

Question

Which of the following gas is displaced when metal reacted with and ?

Choices

Choice (4) Response

a.

b.

c.

d.

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