The volume of gases H₂, CH₄, CO₂ and NH₃ adsorbed by 1g of charcoal at 288K are in the order:

1) H₂  >CH₄ > CO₂ > NH₃
2) CH₂ > CO₂ > NH₃ > H₂
3) CO₂ >  NH₃ > H₂ > CH₂
4) NH₃  > CO₂ > CH₄  > H₂

Transition metals are less reactive than alkali metals because they have:

1) high ionisation potential and low melting point
2) high ionisation potential and high melting point
3) low ionisation potential and low melting point
4) low ionisation potential and high melting point

Which of the following compounds will exhibit geometrical isomerism? 

1) 1 - Phenyl - 2 - butene
2) 3 - Phenyl - 1- butene
3) 2 - Phenyl - 1- butene
4) 1, 1 - Diphenyl - 1 - propane

In which of the following compounds boron atoms are in sp² and sp³ hybridisation states?

1) Borax
2) Diborane
3) Borazole
4) All of the above

Silica is added to roasted copper ore during smelting in order to remove:

1) cuprous oxide
2) cuprous sulphide
3) ferrous sulphide
4) ferrous oxide

Alkaline earth metals burn in nitrogen and form nitrides of type M₃N₂. which of them is volatile in nature?

1) Mg₃N₂
2) Ba₃N₂
3) Ca₃N₂
4) Be₃N₂

Suppose two elements X and Y combine to form two compounds XY2? and X3?Y2?. 0.1 mol of former weighs 10 g while 0.05 mol of the latter weighs 9 g. The atomic masses of X and Y are, respectively:

1) 60 and 40
2) 30 and 40
3) 40 and 30
4) 40 and 60

Number of identical Cr-O bonds in dichromate ion Cr₂O₇²⁻ is :

1) 4
2) 6
3) 7
4) 8

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by :

1) rubbing with cotton cloth

2) hot air blower

3) dry cotton wool

4) filter paper

Which type of dyes are not used to dye nylon and polyester fibres?

1) Vat dyes
2) Basic dyes
3) Disperse dyes
4) Insoluble azo dyes