Question

i) 100 g of calciumcarbonate decomposesto form56 g of calciumoxide, themass of carbon

dioxide liberated will be

(a)34 g. (b) 44 g. (c) 50 g. (d)32 g.

ii)The ratio ofmasses of calciumand oxygen and carbon and oxygen formed by the decomposition of

calcium carbonate will be

(a) 4 :2and3:5,respectively. (b) 3 : 5 and 3 : 8,respectively.

(c) 5 :2 and 3 :8,respectively. (d) 5 : 5 and 3 : 2,respectively.

(iii)The formula unit mass of calcium carbonate is

(a) 100 u. (b) 72 u. (c) 92 u. (d)98 u.

(iv)Themass of calciumoxide produced by the thermaldecomposition of 200 g of calciumcarbonate will be

(a)111 g. (b)115 g. (c) 113 g. (d) 112 g.

(v) The number of moles of calcium carbonate present in 20 g of the substance are

(a) 0.3. (b)3. (c)0.2. (d) 2.​

Answer 1

Answer:

44

Explanation: