When acetic acid is added to sodium hydrogen carbonate a gas is evolved. Choose the correct statements regarding the gas evolved.
(i) It turns lime water milky,
(ii) It extinguishes a burning splinter
(iii) It dissolves in a solution of sodium hydroxide
(iv) It has a pungent odor.

a. (i) and (ii)

b. (i), (ii) and (iii)

c. (ii), (iii) and (iv)

d. (i) and (iv)

                                                      (OR)

Cooking utensils are made of aluminum. Which of the following aluminum qualities is accountable for the same?

a. Good thermal conductivity

b. Good electrical conductivity

c. Ductility

d. High melting point

The gas that evolved is carbon dioxide, which turns lime water milky. Carbon dioxide is a fire extinguisher that can extinguish a burning candle or splinter and dissolve in sodium hydroxide solution to form sodium carbonate, but this gas is odourless. Statements (i), (ii) and (iii) are correct. So, the last statement is false regarding the evolved gas.

 Hence option (b) (i) ,(ii) and (iii) is correct.

                                   (OR)

Aluminium is ductile and has high electrical conductivity; this property is not useful in making utensils. Aluminium has good thermal conductivity and a high melting point. The commonly used metals in making utensils are copper, steel and aluminium. Copper and aluminium are the most preferred due to their conduction of heat. 

Hence option (d) (i) and (iv) is correct.