Multiple Choice QuestionsIncreasing order (lowest first) for the values of e/m for electron (e), proton (p), neutron (n) and α-particles is
e, p, n, α
n, α, p, e
n, p, e, α
n, p, α, e
A particle moving with a velocity 106 m/s will have de-Broglie wavelength nearly [Given, m= 6.62 × 10-27 kg, h = 6.62 × 10-34 J-s]
10-9m
10-13 m
10-19 m
1 Å
Bohr's radius of 2nd orbit of Be3+ is equal to that of
4th orbit of hydrogen
2nd orbit of He+
3rd orbit of Li2+
first orbit of hydrogen
The temperature, at which a gas shows maximum ideal behaviour, is known as
Boyle's temperature
inversion temperature
critical temperature
absolute temperature
Which of the following is a wrong statement about equilibrium state?
Rate of forward reaction=Rate of backward reaction
Equilibrium is dynamic
Catalysts increase value of equilibrium constant
Free energy change is zero
A + B C + D. Initially moles of A and B are equal. At equilibrium, moles of C are three times that of A. The equilibrium constant of the reaction will be
1
3
4
9
A weak acid HX has dissociation constant 10-5. The pH of 0.1 M solution of this acid will be
2
3
4
5
Which of the following is not a buffer solution?
100 mL 0.1 M CH3COOH+ 50 mL 0.1 M CH3COONa
100 mL 0.1 M CH3COOH+ 50 mL 0.1 M NaOH
50 mL 0.1 M CH3COOH+ 100 mL 0.1 M NaOH
100 mL 0.1 M NH4OH+ 50 mL 0.1 M HCl
C.
50 mL 0.1 M CH3COOH+ 100 mL 0.1 M NaOH
Acidic buffer is a mixture of weak acid and its salt with strong base. Similarly, basic buffer is a mixture of weak base and its salt with strong acid. Hence, 50 mL 0.1 M CH3COOH+ 100 mL 0.1 M NaOH does not constitute a buffer solution because in this case millimoles of acid are less than that of strong base, which after reaction with strong base gives salt. Now, the solution contains only strong base and salt but no weak acid. Hence, no buffer is formed.
If Ksp Of Ag2S is 10-17, the solubility of Ag2S in 0.1 M solution of Na2S will be
10-8
5 × 10-9
10-15
10-16
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