Chemistry Question Bank

Carbon shows a maximum covalency of four whereas other members can expand their covalence due to

The purest form of coal is

What is the number of free electrons present on each carbon atom in graphite ?

In graphite, the layers of carbon atoms are held by

In graphite, C atom is in .......... state.

Which of the following does not depict properties of fullerenes ?

Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +

When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to

AlCl3 on hydrolysis gives:

Which one of the following is not the characteristic property of carbon ?

Graphite is soft while diamond is hard because

Moderate electrical conductivity is shown by

Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order

There is a large number of carbon compounds due to

Maximum ability of catenation is shown by

Alumina is:

Alumina is:

When alumina is heated with carbon in nitrogen atmo- sphere, the products are:

Which of the following will be formed, if we heat an aqueous solution of AlCl3 to dryness ?

Heating an aqueous solution of aluminium chloride to dryness will give

Alumina may be converted into anhydrous aluminium chloride by:

What are X and Y in the reaction ? heat 3B H 6X 3[BH (X) ] [BH ] Y 12H + - + ® ¾¾¾® +

Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not fomed in these conditions?

A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form ‘A’ and HCl. ‘A’ is mixed with NH3 and heated to 200oC to form ‘B’. The formula of ‘B’ is:

From B2H6, all the following can be prepared except: