Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 46 - 52 of 209

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Question 46

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Question

MCQ▾

Which type of reaction is combustion?

Choices

Choice (4)Response

a.

Redox reaction

b.

Substitution

c.

Oxidation

d.

Reduction

Question 47

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Question

MCQ▾

Select the true statement from the following regarding petroleum?

Choices

Choice (4)Response

a.

Heavies than water and insoluble in it

b.

Lighter than water & insoluble in water

c.

Heavies than water and soluble in it

d.

Lighter than water and soluble in it.

Question 48

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Question

MCQ▾

Which of the following metal did not give any reaction with Hydrochloric acid (HCl)?

Choices

Choice (4)Response

a.

Iron –

b.

Aluminium -

c.

Silver –

d.

Magnesium –

Question 49

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Question

MCQ▾

Which of the following will be produced if non-metals combine with oxygen?

Choices

Choice (4)Response

a.

Basic oxide

b.

Amphoteric oxide

c.

Acidic oxides

d.

Question does not provide sufficient data or is vague

Question 50

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Question

MCQ▾

The process “cracking” related to?

Choices

Choice (4)Response

a.

Petroleum

b.

Hydrocarbons

c.

Coke

d.

Coal

Question 51

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Question

MCQ▾

When oil well is drilled through rocks, which of the following comes out first?

Choices

Choice (4)Response

a.

Gas carbon

b.

Coal gas

c.

Natural gas

d.

Harsh gas

Question 52

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Question

MCQ▾

When you take a burning wood and you poured water over that burning wood, the fire of wood goes off, because?

Choices

Choice (4)Response

a.

The flame vapourises

b.

Decrease in temperature of wood

c.

Water molecules reacts with oxygen present in that flame.

d.

Temperature of water goes-up