Hydrogen

Methane reacts with steam at 1273 K in the presence of nickel catalyst to form :

1. CO and H2
2. CO and H2O
3. CO2 and H2
4. CO2 and H2O

Which of the following statements are NOT correct? Choose the most appropriate answer from the options given below:

1. B, D only
2. D, E only
3. A, B, C only
4. B, C, D, E only

The element used for welding metals with high melting points is

1. He
2. Cl2
3. H2
4. Ne

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

1. Neutron (n)
2. Beta ( -)
3. Alpha ( )
4. Gamma ( )

The method used to remove temporary hardness of water is :

1. Ion-exchange method
2. Synthetic resins method
3. Calgon’s method
4. Clark’s method

Among CaH2, BeH2, BaH2, the order of ionic character is

1. BeH2 < CaH2 < BaH2
2. CaH2 < BeH2 < BaH2
3. BeH2 < BaH2 < CaH2
4. BaH2 < BeH2 < CaH2

(I) H2O2 + O3 H2O + 2O2 (II) H2O2 + Ag2O 2Ag + H2O + O2 Role of hydrogen peroxide in the above reactions is respectively

1. oxidizing in (I) and reducing in (II)
2. reducing in (I) and oxidizing in (II)
3. reducing in (I) and (II)
4. oxidizing in (I) and (II)

Some statements about heavy water are given below: Which of the above statements are correct?

1. (i) and (ii)
2. (i), (ii) and (iii)
3. (ii) and (iii)
4. (i) and (iii)

Which one of the following molecular hydrides acts as a Lewis acid?

1. NH3
2. H2O
3. B2H6
4. CH4

The structure of H2O2 is

1. spherical
2. non-planar
3. planar
4. linear

The life span of atomic hydrogen is

1. fraction of one second
2. one year
3. one hour
4. one day