Question

Write the balanced chemical equations for the following reactions
and identify the type of reaction in each case
(a) Nitrogen gas is treated with hydrogen gas in the presence of a
catalyst at 773K to form ammonia gas.
(b) Limestone is heated strongly to form quicklime and
carbondioxide gas is evolved

NCERT Class X
Science - Exemplar Problems

Chapter_SAMPLE QUESTION PAPER-I

Answer 1

(a) N₂+3H₂(₇₇₃K)⇒2NH₃(g)↑
(b) CaCO₃ Δ⇒CaO+CO₂(g)↑