A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Chloroacetic acid is a stronger acid than acetic aci This can be explained using
A. +I effect
B. - M effect
C. - I effect
D. + M effect
2. Reaction of methyl bromide with aqueous sodium hydroxide involves
A. racemisation
B. inversion of configuration
C. SN 1 mechanism
D. SN2 mechanism
3. 44 g is treated with sodium carbonate solution to precipitate all the Ca+2 ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture (atomic mass of Ca = 40) is
A. 75
B. 69.4
C. 25
D. 30.6
4. 75, which would combine with 8 g of oxygen is
A. 31.75
B. 1
C. 3.175
D. 8
5. 5 gm of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is
A. 1000 cm3
B. 200 cm3
C. 100 cm3
D. 2000 cm3
6. The maximum concentration of alcohol that does not impair faculties of the human body is
A. 23 mg/100ml
B. 9 mg/100 ml
C. 3 mg/100 ml
D. 1mg/100 ml
7. The substance that is added to make natural rubber strong and more bouncy is
A. polythene
B. sponge
C. sulphur
D. chlorine
8. The wave number of the spectral line in the emission spectrum of hydrogen will be equal to times the Rydberg's constant if the electron jumps from
A. n = 3 to n = 1
B. n = 9 t0 n = 1
C. n = 10 t0 n = 1
D. n = 2 t0 n = 1
9. The chemical used as a 'fixer' in photography is :
A. borax
B. sodium thiosulphate
C. sodium sulphate
D. ammonium per sulphate
10. Which of the following forms a colour less solution in aqueous medium?
A. Cr 3+
B. Ti 3+
C. V 3+
D. Sc 3+
11. Lowest percentage of carbon is in
A. cast iron
B. steel
C. wrought iron
D. pig iron
12. Chlorination' is
A. a process of converting chlorides into chlorine
B. adding small amounts of chlorine to contaminated water
C. a chemical reaction in which chlorine is formed
D. the formation of a salt containing chlorine
13. For transition metal octahedral complexes, the choice between high spin and low spin electronic configurations arises only for
A. d1, d2 and d8 complexes
B. d1 to d3 complexes
C. d7 to d9 complexes
D. d4 to d7 complexes
14. In order to prevent the corrosion of iron pipes, they (are often coated with a layer of zinc. This process is termed as
A. electroplating
B. annealing
C. galvanization
D. volcaization
15. The gas whose aqueous solution is strongly acidic in nature is
A. ammonia
B. phosphine
C. sulphur dioxide
D. hydrogen sulphide
16. When an iron nail gets rusted, iron oxide is formed :
A. without any change in the weight of the nail
B. with increase in the weight of the nail
C. with decrease in the weight of the nail
D. without any change in colour or weight of the nail
17. The substance present in abundant amounts in sea water is
A. potassium chloride
B. common salt
C. sand
D. calcium carbonate
18. 02 ´ 1025 hydrogen chloride molecules is
A. 10
B. 100
C. 5
D. 50
19. Air is a/an :
A. compound
B. element
C. mixture
D. electrolyte
20. The compound used as an anti-malarial drug is
A. chloroquine
B. penicillin
C. hydroquinone
D. aspirin
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