Choose the correct code regarding the roasting process:
(I) It is the process of heating ore in air to obtain the oxide

(II) It is an exothermic process
(III) It is used for hydrated oxide and oxysalt ore

(IV) It is used after the concentration of ore

Q. Choose the correct option using the code regarding roasting process.
I) It is the process of heating the ore in air in a reverberatory furnace to obtain the oxide.
II) It is an exothermic process.
III) It is used for the concentration of sulphide ore.
IV) It removes easily oxidisable volatile impurities present in the concentrated ore.

Q. Make the correct match
ABCDE
IIIIIIVVI
IIIVIIIIV
IIIIIIIVV
IIIIIIIVV
VIVIIIIII

Q. Consider the following statements: Roasting is carried out to :
(i) Convert sulphide to metal oxides and $S{O}_2$
(ii) Remove water of hydration
(iii) melt the ore
(iv) Remove arsenic and sulphur impurities
of these statements :

Q.

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Q.

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)