IGCSE Chemistry: Specimen Questions with Answers 81 - 83 of 240

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Question 81

Question

MCQ▾

Niter is a nitrate salt. So ________ acid is used in making it.

Choices

Choice (4)

a.

Vinegar

b.

Hydrochloric acid

c.

Nitric acid

d.

Sulphuric acid

Answer

c.

Explanation

Nitric acid is used to make niter .

That is why nitric acid is called spirit of niter.

Question 82

Write in Short

Short Answer▾

Impure water needs to be treated if it is to be used in the home.

Explain why filtration and chlorination are used in the water treatment process.

Explanation

  1. A water filter removes impurities by minimizing contamination of water using a fine physical barrier, a chemical process, or a biological process.
  2. Chlorination is the process of adding chlorine to drinking water to disinfect it and kill germs. Different processes can be used to achieve safe levels of chlorine in drinking water.

Question 83

Edit

Write in Short

Short Answer▾

Suggest an explanation why the rate of reaction in an explosion could increase rather than decrease with time.

Explanation

As the explosion would continue then the particles that are more reactive would help in increasing the rate of explosion. The temperature would also increase so the particles would react in a faster manner and this would help in increase in rate of explosion.

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