When 1 g of compound (X) is subjected to Kjeldahl's method for estimation of nitrogen, 15 mL, 1M H2SO4 was neutralized by ammonia evolved. The percentage of nitrogen in compound (X) is : (A) 21 (B) 0.

Question

When 1 g of compound (X) is subjected to Kjeldahl's method for estimation of nitrogen, 15 mL, 1M H2SO4 was neutralized by ammonia evolved. The percentage of nitrogen in compound (X) is :

(A) 21
(B) 0.42
(C) 42
(D) 0.21

Prashant Kotian · Accepted Answer

Correct answer: C. eq. of H2SO4 = eq. of Ammonia  15 1 2  = moles of ammonia × 1  Moles of ammonia = moles of 'N'  Weight of nitrogen = 15 1 2 14   = 0.42 % weight of 'N' = 0.42 100 42%  

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