NSO Level 1- Science Olympiad (SOF) Class 8: Questions 439 - 443 of 1076

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Passage

Megha got a magnesium ribbon from the science lab. She burnt it, took the white ash and mixed it in water. Then she tested the solution with a litmus paper. Red litmus paper turned blue. She assumed that the ash is basic in nature.

Question number: 439 (1 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

The chemical reaction that took place in the experiment was

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 440 (2 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

Which chemical property of metals is verified here?

Choices

Choice (4)Response

a.

Metals react with oxygen to form metallic oxides.

b.

Metallic oxides are basic in nature.

c.

Both a. and b. are correct

d.

None of the above

Question number: 441 (3 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

The white ash referred in the experiment is

Choices

Choice (4)Response

a.

Carbon dioxide

b.

Magnesium Oxide

c.

Magnesium carbonate

d.

Magnesium dioxide

Question number: 442

» Synthetic Fibres and Plastics

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MCQ▾

Question

We are familiar with the four R’s used in environment protection. Identify the R used in the situations

Rani always purchases things which are very much necessary for her. She never purchase and store things which spoil easily, in bulk quantity.

Choices

Choice (4)Response

a.

Reuse

b.

Recover

c.

Recycle

d.

Reduce

Question number: 443

» Metals and Non-Metals

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MCQ▾

Question

Iron grills and gates are painted well before rainy season. The reason behind this statement is

Choices

Choice (4)Response

a.

Statement c is the explanation of a and b

b.

Paint acts as a waterproof coating to protect iron from rusting.

c.

Paint is a water proof

d.

Iron undergoes rusting in presence of moisture

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