H₂O₂ on oxidation gives

• O^2-

• OH^-

• O${}_2^{-}$

• O₂

The IE of hydrogen atom is 13.6 eV. The energy required to remove an electron in the n = 2 state of the hydrogen atom is

• 27.2 eV

• 13.6 eV

• 6.8 eV

• 3.4 eV

Hydrogen is prepared on large scale for industrial use

• by Zn + H₂SO₄

• by Al + NaOH

• by Na + C₂H₅OH

• from water gas

When conc. H₂SO₄ comes in contact with sugar, it becomes black due to 

• hydrolysis

• hydration

• decolourisation

• dehydration

The temperature of maximum density of H₂O and D₂O respectively are

• 0°C and 11.6°C

• 4°C and 0°C

• 4°C and 11.6°C

• 4°C and 12.5°C

The molarity of pure water is

• 18

• 5.56

• 55.6

• 100

The hydration energy of Mg²⁺ ions is higher than that of

• Al³⁺

• Be²⁺

• Na⁺

• None of these

A sample of gasoline contain 81% octane and 19% n-heptane. Its octane, number will be

• 19

• 81

• 100

• 62

The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to forma colourless solid from which hydrogen is released on treatment with water. The metal is

• Al

• Ca

• Cu

• Zn

Which is the correct statement?

• Hydrogen peroxide can oxidise permanganate ion.

• Permanganate ion can oxidise manganous ion.

• Manganate ion is more stable than permanganate ion.

• Permanganate ion cannot be reduced to manganate ion