1
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic wt. - Cr = 52 u, Ba = 137 u)
A
(NH4)2Cr2O7(s) $$ \to $$ N2(g) + 4H2O(g) + Cr2O3(s)
B
2NH4NO3(s) $$ \to $$ 2 N2(g) + 4H2O(g) + O2(g)
C
Ba(N3)2(s) $$ \to $$ Ba(s) + 3N2(g)
D
2NH3(g) $$ \to $$ N2(g) + 3H2(g)

Explanation

(a)   Molar mass of (NH4)2 Cr2O7 = 252 g/mol.

252g of (NH4)2 Cr2 O7 produce 28g mole of N2

$$\therefore\,\,\,$$ 1 g of (NH4)2 Cr2 O7 Produce = $${{28} \over {252}} = 0.111$$ g N2

(b)    Molar mass of NH4 NO3 = 80 g/mol

2 $$ \times $$ 80 g of NH4 NO3 produce 28 $$ \times $$ 2g of N2

$$\therefore\,\,\,$$ 1 g of NH4 NO3 produce = $${{28 \times 2} \over {2 \times 80}}$$ = 0.35 g N2

(c)    Molar mass of Ba(N3)2 = 221 g/mol

221 g of Ba(N3)2 produce 3 $$ \times $$ 28 g of N2

$$\therefore\,\,\,$$ 1 g of Ba(N3)2 produce = $${{3 \times 28} \over {221}}$$ = 0.38 g of N2

(d)    Molar mass of NH3 = 17 g/mol

17 $$ \times $$ 2 NH3 produce 28 g of N2

$$\therefore\,\,\,$$ 1 g of NH3 produce = $${{28} \over {17 \times 2}}$$ = 0.823 g of N2
2
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

In KO2, the nature of oxygen species and the oxydation state of oxygen atom are, respectively :
A
Oxide and $$-$$ 2
B
Superoxide and $$-$$ 1/2
C
Peroxide and $$-$$ 1/2
D
Superoxide and $$-$$ 1

Explanation

KO2 is called potassium superoxide. Here O$$_2^ - $$ is the superoxide ion.

Oxidation state of K is +1 and let oxidation state of oxygent atom is = x

$$\therefore\,\,\,$$ 1 + 2(x) = 0

$$ \Rightarrow $$$$\,\,\,$$ x = $$-$$ $${1 \over 2}$$
3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

In XeO3F2, the number of bond pair(s), $$\pi $$-bond(s) and lone pair(s) on Xe atom respectively are :
A
5, 2, 0
B
4, 2, 2
C
5, 3, 0
D
4, 4, 0

Explanation


$$\therefore\,\,\,$$ Number of Bond pairs = 5

Number of $$\pi $$ bonds = 3

Number of lone pairs = 0
4
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

Among the oxides of nitrogen : N2O3, N2O4 and N2O5; the molecule(s) having nitrogen-nitrogen bond is / are :
A
Only N2O5
B
N2O3 and N2O5
C
N2O4 and N2O5
D
N2O3 and N2O4

Explanation



$$ \therefore $$   N2O3   and   N2O4   has   N $$-$$ N   bond.

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