Q1. The substance most commonly used as a food preservative is
(a) sodium carbonate
(b) tartaric acid
(c) acetic acid
(d) sodium salt of benzoic acid
Q2. Catalyst is a substance which
(a) increases the rate of the reaction
(b) decrease the rate of reaction
(c) has no action on the rate of the reaction
(d) None of these
Q3. Which of the following gases is most toxic?
(a) Carbon dioxide
(b) Carbon monoxide
(c) Sulphur dioxide
(d) Chlorine
Q4. Sour milk contains
(a) acetic acid
(b) tartaric acid
(c) citric acid
(d) lactic acid
Q5. The acid used in lead storage cells is
(a) phosphoric acid
(b) hydrochloric acid
(c) nitric acid
(d) sulphuric acid
Q6. Alum stops bleeding in minor cuts because of
(a) solvation
(b) emulsion
(c) dialysis
(d) coagulation
Q7. ‘Plaster of Paris’ is made by partial dehydration of
(a) Epsom salt
(b) gypsum salt
(c) blue vitriol
(d) green vitriol
Q8. Water can be separated from alcohol water mixture by
(a) decantation
(b) evaporation
(c) distillation
(d) sublimation
Q9. ‘Milk Sugar’ is
(a) Lactose
(b) Maltose
(c) Galactose
(d) Sucrose
Q10. Petroleum is a mixture of
(a) elements
(b) hydrocarbons
(c) polymers
(d) salts
Solutions
S1. Ans.(d)
S2. Ans.(a)
S3. Ans.(b)
S4. Ans.(d)
S5. Ans.(d)
S6. Ans.(d)
S7. Ans.(b)
S8. Ans.(c)
S9. Ans.(a)
S10. Ans.(b)
