Page 107 - Chemistry - XI

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. The best soap will have
(a) low foaming capacity (b) high foaming capacity
(c) very low foaming capacity (d) low solubility

Q2. Which of the following is soft water?
(a) Rain water (b) River water (c) Sea water (d) Well water

Q3. Temporary hardness of water is caused by
(a) Ca(HCO ) (b) Mg(HCO ) (c) both (a) and (b) (d) CaCO 3
3 2
3 2
Q4. Hardness of water can be removed by
(a) boiling (b) adding washing soda

(c) adding lime Ca(OH) (d) all of these
2
Q5. If FeCl is added to a boiled tea solution, we should get violet colouration which shows presence
3
of
(a) phenolic group (b) alcoholic group (c) –COOH group (d) all of these

Q6. Which kind of tea is most acidic?
(a) black tea (b) Green tea (c) White tea (d) Yellow tea

Q7. Which kind of tea has the highest caff eine content?
(a) Black tea (b) Herbal tea (c) Green tea (d) White tea

Q8. Which of the following has the maximum antioxidants?
(a) Black tea (b) Coff ee (c) Green tea (d) All of these

Q9. The acid present in tea and coff ee is
(a) tannic acid (b) lactic acid (c) oxalic acid (d) acetic acid

Q10. Which of the following is the most volatile liquid?
(a) Water (b) Ethanol (c) CHCl (d) Diethyl ether
3
Q11. Which of the following has the highest vapour pressure?
(a) Ethanol (b) Acetone (c) Chloroform (d) CCl 4

Q12. Higher the boiling point,
(a) higher will be the rate of evaporation (b) lower will be the rate of evaporation
(c) more volatile liquid (d) none of these is correct

Q13. Rate of evaporation increases with

(a) increase in temperature (b) increase in surface area
(c) decrease in pressure acting on liquid (d) all of these

105