Charcoal

Q.

Which amongst the following is the purest form of charcoal?

1. Wood charcoal

2. Sugar charcoal

3. Bone charcoal

4. Lamp black

Q. is the purest form of amorphous carbon.

1. Wood charcoal
2. Sugar charcoal
3. Bone charcoal

Q.

Wood charcoal floats on water.

1. True

2. False

Q. Which of the following is used in the preparation of activated charcoal?

1. Wood charcoal
2. Bone charcoal
3. Coal
4. Sugar charcoal

Q.

Impure black coloured solution of acetic acid is added to activated charcoal and heated for a while. Then the colour of acetic acid changes to its purest form, impurities are absorbed by activated charcoal. Which of the following characteristics of coal absorbs the impurity?

1. Colour

2. Porosity

3. Toughness

4. Adsorbance

Q. The density of red hot charcoal is less than water, hence it floats on the surface of water.

1. True
2. False

Q.

Which are the different useful compounds of carbon?

1. All of these

2. Coal

3. Diamond

4. Graphite

Q. Assertion: A red hot charcoal floats on the surface of water.
Reason: Its actual density is greater than water.

1. Assertion is correct but reason is incorrect.
2. Assertion is incorrect but reason is correct.
3. Both assertion and reason are correct but reason is not the correct explanation.
4. Both assertion and reason are correct and reason is the correct explanation.

Q. The colour of gasoline is an indication of it's:

1. lead susceptibility.
2. octane number.
3. gum forming tendency & thoroughness of refining.
4. both A and B

Q. What is the name of the process heating of coal in the absence of air

Q. Gun-powder is a mixture of

1. nitrates of potassium and sodium
2. sulphates of potassium and mangnesium
3. charcoal, sulphur and potassium nitrate
4. potassium sulphate and charcoal

Q.

Which of the following is/are uses of activated charcoal?

1. Decolourisation of solutions

2. Purification of sugar

3. Removal of taste

4. All of the above