Hydrogen

The molarity of pure water is:

• 100

• 55.6

• 18

• 5.56

Which of the following reactions depicts the reducing action of H₂O₂ ?

• C₆H₆ + H₂O₂ $\to$ C₆H₅OH + H₂O

• 2I^- + 2H⁺ + H₂O₂ $\to$ I₂ + H₂O

• 2Mn${\mathrm{O}}_4^{-}$ + 6H⁺ +5H₂O₂ $\to$2Mn²⁺ + 5O₂ + 8H₂O

• PbS + 4H₂O₂ $\to$ PbSO₄ + 4H₂O

The density of SO₂ at STP is 2.86 kg m³. Its density at 819°C and 2 atmospheres is:

• 0.715 kg m^-3

• 1.43 kg m^-3

• 2.86 kg m^-3

• 4.26 kg m^-3

Azeotropic mixture of HCl and water has:

• 20.2% HCl

• 22.2% HCl

• 63% HCl

• 84% HCl

Deuterium oxide is used in nuclear reactor as

• source of $\mathrm{\alpha }$-particle

• source of deuteron

• moderator

• fuel

Fenton's reagent is

• NaOH + FeSO₄

• H₂O₂ + FeSO₄

• H₂O₂ + ZnSO₄

• H₂O₂ + MgSO₄

H₂O is polar, whereas BeF₂ is not because

• electronegativity of F is greaterthan that of O.

• H₂O involves H-bonding, whereas BeF₂ is a discrete molecule

• H₂O is angular and BeF₂ is linear

• H₂O is linear and BeF₂ is angular.

The correct order of solubility ofthe following compounds in water is

• Ba(OH)₂ < Mg(OH)₂

• BaCO₃ > CaCO₃

• Ca(OH)₂ $\simeq$ Mg(OH)₂

• CaSO₄ < MgSO₄

H₂O₂ can be obtained when following reacts with H₂SO₄ except with

• BaO₂

• PbO₂

• Na₂O₂

• SrO₂

Which of the following reactions increases the production of dihydrogen from synthesis gas?

• ${\text{CH}}_{4_{\left(g\right)}}+H_2{O}_{\left(g\right) }\underset{Ni}{\overset{1270K}{\to }}C{O}_{\left(g\right)}+H_{2_{\left(g\right)}}$

• ${\text{C}}_{\left(s\right)}+H_2{O}_{\left(g\right)}\underset{}{\overset{1270 K}{\to }} C{O}_{\left(g\right)}+{H_2}_{\left(g\right)}$

• ${\text{CO}}_{\left(g\right)}+H_2{O}_{\left(g\right)}\underset{Catalyst}{\overset{637K}{\to }}C{O}_{2_{\left(g\right)}}+H_{2_{\left(g\right)}}$

• ${\text{C}}_2{H}_6+2H_{2}O \underset{Ni}{\overset{1270K}{\to }}2CO+5H_2$