How many faradays are required to reduce 1 mol of Cr₂O to Cr³⁺ in acid medium?

• 2

• 3

• 5

• 6

Nitric acid can be obtained from ammonia via the formations of the intermediate compounds

• nitric oxide and nitrogen dioxide

• nitrogen and nitric oxide

• nitric oxide and dinitrogen pentoxide

• nitrogen and nitrous oxide

Hydrogen peroxide oxidises $Fe(CN{)}_6{]}^{4-} to [Fe(CN{)}_6{]}^{3-}$ in acidic medium but reduces $\left[Fe\right(CN{)}_6{]}^{3-} to \left[Fe\right(CN{)}_6{]}^{4-}$ in alkaline medium. The other products formed are, respectively

• H₂O and (H₂O + OH^-)

• (H₂O + O₂) and H₂O

• (H₂O + O₂) and (H₂O + OH^-)

• H₂O and (H₂O + O₂)

Consider the following reaction,

The values of x,y and z in the reaction are respectively

• 5,2 and 16

• 2,5 and 8

• 2,5 and 16

• 2,5 and 16

Which of the following chemical reactions depicts the oxidizing behaviour of H₂SO₄?

• 2HI+ H₂SO₄ →I₂ +SO₂+2HO

• Ca(OH)₂ +H₂SO₄ → CaSO₄ +2H₂O

• NaCl +H₂SO₄ → NaHSO₄ + HCl

• NaCl +H₂SO₄ → NaHSO₄ + HCl