NCERT Class 12 Chemistry Short Questions & Answers

NCERT Class 12 Chemistry Short Questions & Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry Short Questions & Answers

1 Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
A 0.40
B 0.46
C 0.36
D 0.20

Answer: 0.20
2 The first step in extraction of copper from CuFeS2 is
A roasting in O2
B magnetic separation
C electrolysis of ore
D reduction by carbon

Answer: roasting in O2
3 The sugar present in milk is
A lactose
B Glucose
C Sucrose
D Maltose

Answer: lactose
4 Which of the following has magnesium?
A Vitamin B12
B Chlorophll
C Haemocyanin
D Carbonic anhydrate

Answer: Chlorophll
5 A first order reaction has specific reaction rate 10-2s-1. How much time it will take for 20g of reactant to reduce to 5g?
A 138.6 s
B 238.6 s
C 346.5 s
D 693.0 s

Answer: 138.6 s
6 Which of the following is affected by catalyst?
A ∆H
B ∆S
C ∆G
D Ea

Answer: Ea
7 The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is
A 0.5 × 10-3 s-1
B 5.0 × 10-3 s-1
C 5.0 × 10-2 s-1
D 0.5 × 10-2 s-1

Answer: 0.5 × 10-3 s-1
8 The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?
A 0.72 M
B 3.60 M
C 1.08 M
D 0.36 M

Answer: 0.72 M
9 Among the ligands NH3, en, CN and CO, the correct order of field strength is
A NH3 < en < CN– < CO
B CN– < NH3 < CO < en
C en < CN–< NH3 < CO
D CO < NH3 < en < CN–

Answer: NH3 < en < CN– < CO
10 Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is
A complex forming nature.
B low heats of hydration.
C high ionization energies.
D high heat of vaporization.

Answer: complex forming nature.

    More Questions Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15

Comments