Which one among the following does not have an allotrope?
Important Questions on Non-Metals and their Compounds
Consider the following statements:
I. Diamond is hard and graphite is soft.
II. Diamond is soft and graphite is hard.
III. Diamond is a bad conductor, but graphite is a good conductor.
IV. Diamond is a good conductor, but graphite is a bad conductor.
Which of the statement(s) given above is/are correct?
The purest form of carbon is:
Which of the following statements, in connection with the properties of water, is/are correct?
I. Water has a higher specific heat in comparison with other liquids.
II. Water has no dipole moment.
III. Water has a low heat of vaporisation.
Select the correct answer using the codes given below.
Which one of the following statements, regarding the property of hard water, is/are correct?
I. Temporary hardness of water is due to the presence of soluble magnesium and calcium hydrogen carbonate.
II. Temporary hardness of water can be removed by boiling.
III. Calgon's method is applied to remove the temporary hardness of water.
IV. Permanent hardness of water is removed by Clark's method.
Select the correct answer using the codes given below.
