100. A body of mass 10 mg is moving with a
velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it
would be (Note : h = 6.63 ´ 10-34Js)
(A) 6.63 ´ 10-37m
(B) 6.63 ´ 10-31m
(C) 6.63 ´ 10-34m
(D) 6.63 ´ 10-35m
Answer:: (B)
101. A body of mass x kg is moving with a
velocity of 100 ms-1. Its de Broglie wavelength is 6.62 ´ 10-35m. Hence x is (h
= 6.62 ´ 10-34Js)
(A) 0.15 kg
(B) 0.2 kg
(C) 0.1 kg
(D) 0.25 kg
Answer:: (C)
102. A buffer solution contains 0.1 mole of
sodium acetate dissolved in 1000 cm3 of 0.1 M acetic acid. To the above buffer
solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of
the resulting buffer is equal to ______.
(A) pKa
(B) pKa - Log2
(C) pKa + L0g2
(D) pKa + 2
Answer:: (C)
103. A buffer solution is prepared in which the
concentration of NH3 is 0.30 M and the concentration of is 0.20 M. If the equilibrium constant, Kb
for NH3 equals 1.8 × 10–5, what is the pH of this solution?
(A) 8.73
(B) 9.08
(C) 9.43
(D) 11.72
Answer:: (C)
104. A complex compound in which the oxidation
number of a metal is zero is
(A) K4 [Fe (CN)6]
(B) K3 [Fe (CN)6]
(C) [Ni (CO)4]
(D) [Pl (NH3 )4]Cl2
Answer:: (C)
105. Which of the following is not an ore of
magnesium?
(A) Carnallite
(B) Dolomite
(C) Calamine
(D) Sea water
Answer:: (C)
106. Which of the following has the highest bond
order?
(A) N2
(B) O2
(C) He2
(D) H2
Answer:: (A)
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