Which contains the greatest number of moles of oxygen atoms
i) 1 mol of ethanol
ii) 1 mol of formic acid
iii) 1 mol of H₂O

An atom of an element contains 35 electrons and 45 neutrons. Deduce
(i) the number of protons
(ii) the electronic configuration for the element
(iii) All the four quantum numbers for the last electron

How would you explain the fact that the second ionisation potential is always higher than first ionisation potential?

NH₃ has exceptionally high melting point and boiling point as compared to those of the hydrides of the remaining element of group 15. Explain.

How is plaster of paris prepared ?

Why do astronauts have to wear protective suits when they are on the surface of moon?

State the third law of thermodynamics.

State Le-Chatelier principle.

Which solution has the lower freening point ? 10 g of methanol (CH₃OH) in 100 g of water (or) 20 g of ethanol (C₂H₅OH) in 200 g of water.

Hydrogen gas is diatomic where as inert gases are monoatomic – explain on the basis of MO theory.

The ammonia evolved form 0.20 g of an organic compound by kjeldahl method neutralised 15ml of N/20 sulphare acid solution. Calculate the percentage of Nitrogen.

Explain electromeric effect.

Complete the following :
i) 2 – butyne \(\overset { Lindlar\quad Catalyst }{ \longrightarrow } \)
ii) CH₂ = CH₂ \(\overset { { I }_{ 2 } }{ \longrightarrow } \)
iii) \(\underset { \overset { | }{ Br } }{ { CH }_{ 2 } } -\underset { \overset { | }{ Br } }{ { CH }_{ 2 } } \overset { Zn/{ C }_{ 2 }{ H }_{ 5 }OH }{ \longrightarrow } \)
iv) \({ CaC }_{ 2 }\overset { { H }_{ 2 }O }{ \longrightarrow } \)

Explain the preparation of the following compounds
i) DDT
ii) Chloroform
iii) Biphenyl
iv) Chloropicrin
v) Freon-12

What is green chemistry ?