Multiple Choice QuestionsAlkaline earth's metals are denser than alkali metals, because metallic bonding in alkaline earth's metal is
stronger
weaker
volatile
not present
On mixing urea with nitrous acid, the composition of the products is
NH2-NH2 + CO2
N2 + C + H2O
NH3 + CO2 + H2O
N2 + CO2 + H2O
Mark out the correct decreasing order of ease of addition of halogen.
CH2=CH2 > CH3-CH=CH-CH3 > CH3-C(CH3)=CH2 > (CH3)2C=C(CH3)2
(CH3)2C=C(CH3)2 > CH3-C(CH3)=CH2 > CH3-CH=CH-CH3 > CH2=H2
(CH3)2C=C(CH3)2 > CH3-CH=CHCH3 > CH3-C(CH3)=CH2 > CH2=CH2
CH2=CH2 > CH3-C(CH3)=CH2 > CH3-CH=CH-CH3 > (CH3)2C=C(CH3)2
Decomposition of H2O2 is a first order reaction. Initially, solution of H2O2 having half-life time 15 min is 16 volume. When solution becomes 1 volume
4 min
15 min
30 min
60 min
D.
60 min
Nt = N0 ×
where, Nt = after n half-lives times volume concentration of H2O2 = 1 volume
N0 = initial concentration of H2O2 = 16 volume
n = 4
Therefore, after 4 half-lives times, volume of H2O2 solution becomes 1 volume. Time used in this procedure
= 4 × 15 min
= 60 min
What is the two third life of a first order reaction having k = 5.48 × 10-14s-1?
1 × 1013 s
2 × 1013 s
8 × 1013 s
5 × 1014 s
In a cell that utilises the reaction
Zn (s) + 2H+ (aq) → Zn2+ + H2 (g)
addition of H2SO4 to cathode compartment will
lower the E and shift equilibrium to the left
lower the E and shift the equilibrium to the right
increase the E and shift the equilibrium to the right
increase the E and shift the equilibrium to the left
Which of the following solvents are aprotic ?
I. NH3
II. SO2
III. CH3CN
IV. CH3CO2H
I, II and III
I, III and IV
II and III
I and III
Which of the following reaction is used to make a fuel cell?
Cd (s) + 2Ni(OH)3 (s) → CdO (s) + 2Ni(OH)2 (s) + H2O (l)
2Fe (s) + O2 (g) + 4H+ (aq) → 2Fe2+ (aq) + 2H2O (l)
Pb (s) + PbO2 (s) + 2H2SO4 (aq) → 2PbSO4 (s) + 2H2O (l)
2H2 (g) + O2 (g) → 2H2O (l)
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