chemistry mcq with answers

chemistry mcq with answers
MULTIPLE CHOICE QUESTIONS IN CHEMISTRY
Chemistry Test and Chemistry Quiz
1. A solution has H ion concentration 0.0005 M. Its pOH is
(a) 8.279
(b) 12.285
(c) 10.699
(d) 13.335
Ans. (c)

2. 75% of a first order reaction was completed in 32 min when was 50% of the reaction
Completed?
(a) 24 min
(b) 16 min
(c) 8 min
(d) 48 min Ans. (b)

3. Cyano benzene has
(a) 7 sigma bonds and 4 pi bonds
(b) 7 sigma and 5 pi bonds
(c) 12 sigma and 6 pi bonds
(d) 13 sigma and 5 pi bonds
Ans. (d)

4. The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular mass of X is
(a) 4.0
(b) 8.0
(c) 32.0
(d) 64.0
Ans. (a)

5. When phosphorus reacts with caustic soda, the products are PH3 and NaH2PO2. This reaction is an example of
(a) Oxidation
(b) Reduction
(c) Disproportionation
(d) None of these
Ans. (c)

6. The complete combustion of CH4 gives:
(a) CO + H2
(b) CO + N2
(c) CO2 + H2O
(d) CO + N2O
Ans. (c)

7. The amount of heat released when 20 mL of 0.5 M NaOH is mixed with 100 mL of 0.1 M HCI is x kJ. The heat of neutralization (in kJ mol-1) is
a) – 100 x
(b) – 50x
(c) +l00x
(d) +50x
Ans. (a)

8. Which one of the following is the true covalent oxide of iodine?
(a) I2O4
(b) I2O5
(c) I2O7
(d) I2O9
Ans. (b)

9. Which of the following two are isostructural?
(a) XeF2, IF2
(b) NH3, BF3
(c) CO3-2, SO3-2
(d) Pd5, ICl5
Ans. (a)

10. The complex used as an anticancer agent is
(a) mer [Co (NH3) 3C13]
(b) cis [PtCl2(NH3 )21
(c) cis K2[PtC12Br2J
(d) Na2 [COC14]
Ans. (c)

11. In order to distinguish between C2H5NH2 and C6H5NH2 which of the following reagents is useful?
(a) Hinsberg reagent
(b) 3-naphthol
(c) CHC13/KOH
(d) NaOH
Ans. (b)

12. Propane on hydrolysis in presence of H2SO4and HgSO4 gives
(a) Acetaldehyde
(b) Acetone
(c) Formaldehyde
(d) None of these
Ans. (b)

13. What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOH?
(a) CH3C1
(b) C2H2C1
(c) CC13CHO
(d) CHC13
Ans. (d)

14. Benzene on Ozonolysis yields
(a) Glyoxal
(b) Acetone
(c) Ethanol
(d) Methanol
Ans. (a)

15. How many structural isomers could be obtained from alkane C6H14?
(a) Four
(b) Five
(c) Six
(d) Seven
Ans. (b)
9. The amount of heat released when 20 mL of 0.5 M NaOH is mixed with 100 mL of 0.1 M HCI is x kJ. The heat of neutralization (in kJ mol-1) is
a) – 100 x
(b) – 50x
(c) +l00x
(d) +50x
Ans. (a)

10. Which of the following electrolyte has least molar conductivity?
(a). BeCl2
(b) BC13
(c) LiC1
(d) NaCl
Ans. (b)

11. Gold number is associated with
(a) Electrophoresis
(b) Purple of cassius
(c) Protective colloid
(d) Amount of pure gold
Ans. (c)

12. H2O2 is
(a) Poor polar solvent than water
(b) Better polar solvent than H20
(c) Both have equal polarity
(d) Better polar solvent but its strong auto oxidizing ability limits its use as such
Ans. (c)

13. Sodium metal is kept under
(a) Kerosene oil
(b) Alcohol
(c) Water
(d) Acids
Ans. (a)

14. Which of the following has the highest calorific value?
(a) Coal gas
(b) Water gas
(c) Producer gas
(d) Carbon dioxide gas
Ans. (a)

15. Which out of the following is called sugar of lead?
(a) Pb(NO3) 2
(b) PbC12
(c) PbCO3 ‘Pb (OH) 2
(d) Pb(CH3COO) 2
Ans. (d)

16. In order to distinguish between C2H5NH2 and C6H5NH2 which of the following reagents is useful?
(a) Hinsberg reagent
(b) 3-naphthol
(c) CHC13/KOH
(d) NaOH
Ans. (b)

17. Propyne on hydrolysis in presence of H2SO4and HgSO4 gives
(a) Acetaldehyde
(b) Acetone
(c) Formaldehyde
(d) None of these
Ans. (b)

18. What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOH?
(a) CH3C1
(b) C2H2C1
(c) CC13CHO
(d) CHC13
Ans. (d)

19. Benzene on Ozonolysis yields
(a) Glyoxal
(b) Acetone
(c) Ethanol
(d) Methanol
Ans. (a)

20. How many structural isomers could be obtained from alkane C6H14?
(a) Four
(b) Five
(c) Six
(d) Seven
Ans. (b)

21. Among the following the weakest base is:
(a) H-
(b) CH-
(c) CH3O
(d) cl-
Ans. (d)

22. If 2.0 g of a radioactive isotope has half-life of 20 h, the half-life of 0.25 g of the same substance is
(a) 20h
(b) 80h
(c) 5h
(d) l0h
Ans. (a)

23. K02 is used in oxygen cylinders in space and submarine because it:
(a) Eliminates moisture
(b) Absorbs CO2
(c) Produces ozone
(d) None of the above
Ans. (b)

24. On heating quick lime with coke in an electric furnace we get:
(a) Ca and CO2
(b) CaCO3
(c) CaO
(d) CaC2
Ans. (d)

25. The material used in warfare in making smoke screens for military purposes is:
(a) PH3
(b) PC15
(c) SiCl4
(d) NH3
Ans. (a)

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