Question

Carbon reacts with oxygen to yield carbon monoxide or carbon dioxide, depending on the quantity of oxygen available per
mole of carbon. If excess of O2 is available after initial formation of carbon monoxide, then carbon dioxide is produced.
C+O2 CO
CO + O2 CO2
100 g of oxygen is reacting with different amounts of carbon as given in the following questions. Find out the number of
moles of CO and CO2

respectively in each of the following cases.

13. 10 g of carbon
(A) O,3.125 (B)3.125, 3.125 (C) O, 0.833 (D)0.833, 3.125

14. 100 g of carbon
(A) 6.25,0 (B) 3.125, 6.25 (C) 6.25, 3.125 (D) 0, 6.25
15. 60 g of carbon
(A) 1.25, 3.75 (B) 3.75, 1.25 (C) 1.3, 3.7 (D) 4,2
16. The percentage of nitrogen in urea is about : (H2NCONH2)

(A) 38.4 (B) 46.6 (C) 59.1 (D) 61.3
17. 0.0833 mol of carbohydrate of empirical formula CH2O contains 1 g of Hydrogen. The molecular formula of the
carbohydrate is
(A) C5H10O5

(B) C3H4O3

(C) C12H22O11 (D) C6H12O6

18. The molecular formula of a certain compound is M4O6

. If 18.88 g of the compound contains 10 g of M, the atomic

mass of M is approximately
(A) 40 g (B) 54 g (C) 27 g (D) 12 g
19. The empirical formula of a compound is CH. Its molecular weight is 78. The molecular formula of compound will be
:
(A) C2H2

(B) C3H3

(C) C4H4

(D) C6H6
20. A compound was found to contain nitrogen and oxygen in the ratio nitrogen 28g and 80g of oxygen. The formula
of the compound is
(A) NO (B) N2O3

(C) N2O5

(D) N2O4

Answer 1

Answer:

a,c,b,d

Explanation:

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