Free Chemistry mcq questions test

Free Chemistry mcq questions test
Chemistry Test and Chemistry Quiz
Practice Multiple Choice Questions in chemistry

1. Identify alkenes from the following
(a) C2H2
(b) C2H6
(c) C3H6
(d) C3H4
Ans. (b)

2. Which of the following salt gets hydrolyzed in aqueous solution? A salt of
(a) Weak acid and weak base
(b) Strong acid and weak base
(c) Weak acid and strong base
(d) all of these
Ans. (d)

3. Which of the following Hydrocarbon is used as a fuel?
(a) CO2
(b) C4H10
(c) CH3OH
(d) CH3COOH
Ans. (b)

4. When SO2 dissolves in water the acid formed is
(a) Sulphuric acid
(b) Sulphurous acid
(c) Sulphonic acid
(d) Oleum
Ans. (b)

5. Neopentane and Isopentane are
(a) Allotropes
(b) Isobars
(c) Isomers
(d) Homologues
Ans. (c)

6. CO2 turns lime water milky, due to the formation of
(a) Ca(HCO3) 2
(b) CaCO3
(c) Ca(OH)2
(d) CaO
Ans. (d)


7. Which of the following pa are members of a Homologous series?
(a) CH3O CH3 dH3CH2 - OH
(b) CH3 - CHO; CH3 CH2CHO
(c) CH3CH2 COOH; CH3COOCH3
(d) (CH3)2 CH-OH; CH3 CH2 CH2 - OH

8. Ammonium chloride is a salt of
(a) weak acid and a weak base
(b) weak acid and a strong base
(c) strong acid and a strong base
(d) strong acid and a weak base
Ans. (d)

9. Many salts absorb water from the atmosphere. This property is called
(a) hydration
(b) dehydration
(c) liquescence
(d) efflorescence
Ans. (c)

10. Carboxylic group is present in
(a) Ethylene
(b) Methanoic acid
(c) Formaldehyde
(d) Ethanol
Ans. (b)


11. The reaction of metal with acid results in the formation of
(a) only Hydrogen gas
(b) only salt
(c) both salt and hydrogen gas
(d) none of these
Ans. (c)

12. Which of the following compounds has a double bond?
(a) C14H28
(b) C15H32
(c) C12H22
(d) C16H34
Ans. (a)

13. Which of the following acid does not react with metals?
(a) Sulphuric acid
(b) Phosphoric acid
(c) Carbonic acid
(d) Nitric acid
Ans. (c)
14. The no. of isomers of C6H14 is
(a) 4
(b) 5
(c) 6
(d) 17
Ans. (b)


15. Two neighbors of Homologous series differ by
(a) CH
(b) CH2
(c) CH3
(d) CH4
Ans. (b)

16. Which of the fol1oing is an organic acid?
(a) Sulphurous acid
(b) Nitric acid
(c) Hydrochloric acid
(d) Formic acid
Ans. (d)

17. Sodium hydroxide is
(a) A base
(b) An acid
(c) An alkali
(d) Both base as well as alkali
Ans. (a)

18. The second Homologue of alkyne is
(a) CH
(b) C2H2
(c) C2H4
(d) C3H4
Ans. (d)


19. The reaction of acetic acid and sodium hydroxide results in the formation of
(a) Acidic salt
(b) Basic salt
(c) Neutral salt
(d) None of these
Ans. (b)

20. Which of the following base is used as antacid to neutralize stomach acidity?
(a) Mg(OH) 2
(b) KOH
(c) Ca(OH) 2
(d) NaOH
Ans. (a)


21. The product formed when the white substance obtained by burning magnesium is dissolved in water is
(a) Magnesium oxide
(b) Magnesium carbonate
(c) Magnesium hydroxide
(d) Magnesium sulphate
Ans. (c)


22. The reaction of ammonium hydroxide and carbonic acid results in the formation of
(a) Ammonium chloride and water
(b) Ammonium carbonate and water
(c) Only ammonium carbonate
(d) Only water
Ans. (b)

23. The acidity of soil, which is due to excessive use of fertilizer aminonium sulphate, can be neutralized by adding
(a) Lime
(b) Caustic soda
(c) Washing soda
(d) None of these
Ans. (a)

24. When bitten by ant, the sting causes irritation due to the presence of
(a) A base in the sting
(b) Formic acid in the sting
(c) Poisonous chemicals
(d) Both (a) and (b)
Ans. (b)


25. When an oxide of a non-meal reacts with water which of the following is formed?
(a) Acid
(b) Base
(c) Salt
(d) None of these
Ans. (a)