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. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then
A. there is no relationship
B. DH < Du
C. DH > Du
D. DH = Du
2. Chemical reactions with very high Ea values are generally
A. very fast
B. moderately fast
C. very slow
D. spontaneous
3. The reason for this anomalous behaviour is that graphite
A. has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds.
B. is a non-crystalline substance.
C. is an allotropic form of carbon.
D. has molecules of variable molecular masses like polymers.
4. The location and energy of an electron in an atom can be specified by :
A. atomic mass
B. atomic number
C. quantum numbers
D. None of these
5. The compound solution in water has a pH value lower than seven is
A. ethanol
B. sugar
C. common salt
D. vinegar
6. The mass number of a nucleus is
A. always less than its atomic number
B. the sum of the number of protons and neutrons present in the nucleus
C. always more than the atomic weight
D. a fraction
7. Oxidation is a process which involves
A. the loss of electrons
B. the gain of hydrogen
C. the gain of electrons
D. no change in electrons
8. The percentage of silver in the zinc layer is approximately
A. 89
B. 94
C. 97
D. 91
9. 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
10. Phenol forms a tribromo derivative "X" is
A. bromine in carbon tetrachloride at 0°
B. bromine in water
C. potassium bromide solution
D. bromine in benzene
11. Hydroxyl ion concentration of 1M HCl is
A. 1 ´ 101mol dm-3
B. 1 ´ 1014mol dm-3
C. 1 ´ 10-13mol dm-3
D. 1 ´ 10-1mol dm-3
12. The natural substance from which energy can be harnessed, and is essentially made up of only one element is
A. petroleum
B. coal
C. water (in dams)
D. air (in winds mills)
13. Water, on passing over rocks, becomes hard because it dissolves
A. calcium carbonate
B. sodium chloride
C. sodium carbonate
D. sodium phosphate
14. If the for a given reaction has a negative value, then which of the following gives the correct relationships for the values of DG° and Keq?
A. DGo > 0; Keq < 1
B. DGo > 0; Keq > 1
C. DGo < 0; Keq < 1
D. DGo < 0; Keq > 1
15. In the electrolytic refining of Zinc,
A. graphite is at the anode.
B. the metal ion gets reduced at the anode.
C. acidified zinc sulphate.is the electrolyte.
D. the impure metal is at the cathode.
16. Fraction of total pressure exerted by methane is
A. 1/9
B. 1/3
C. 8/9
D. 1/2
17. The conversion of m-nitrophenol to resorcinol involves respectively
A. reduction, diazotization and hydrolysis
B. hydrolysis, diazotization and reduction
C. hydrolysis, reduction and diazotization
D. diazotization, reduction and hydrolysis
18. Carbon can reduce ferric oxide to iron at a temperature above 983 K because
A. iron has a higher affinity towards oxygen than carbon.
B. carbon monoxide formed is thermodynamically less stable than ferric oxide.
C. carbon has a higher affinity towards oxidation than iron.
D. free energy change for the formation of carbon dioxide is less negative than that for ferric oxide.
19. Which of the following compound would not evolve CO2 when treated with NaHCO3 solution?
A. benzoic acid
B. salicylic acid
C. phenol
D. 4-nitro benzoic acid
20. Of the following complex ions, which is diamagnetic in nature?
A. [Ni(CN)4]2–
B. [NiCl4]2–
C. [CuCl4]2–
D. [CoF6]3–
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