First slide

Hydrogen as a fuel

Question

Correct statements among the following are
A) Hydrogen is a better fuel than petrol
B) $H_{2} O_{2}$ bleaches by reduction
C) Formula of permutit is ${Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}]$
D) H-H bond length is equal to D-D bond length

Moderate

A

A, B, C only
B

A, B only
C

A, D only
D

C, D only

Solution

A) Calorific value of Hydrogen = $\frac{286}{2} kJ / mole$
Calorific value of Petrol = $\frac{5550}{114} kJ / mole$
B) $H_{2} O_{2} \to H_{2} O + (O)$
Coloured matter + (O) $\to Colourless$
$H_{2} O_{2}$ bleaches by oxidation
C) Permutit is ${Na}_{2} {Al}_{2} {Si}_{2} O_{8} . {xH}_{2} O (or) {NaAlSiO}_{4} . {xH}_{2} O$
D) H-H B.L = D-D B.L = 74 Pm

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