Q-21 An example of a reaction in which gas is evolved is
(a) burning of Mg ribbon in air
(b) reaction between Cao and water
(c) reaction between lead nitrate and KI
(d) reaction between limestone and HCI
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0
Answer:
a. mgo (magnesium oxide)
b.co2 (carbon dioxide)
c.no2 (nitrogen dioxide)
d.co2 (carbon dioxide)
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Answer:
(a) when magnesium ribbon is burnt in air then magnesium oxide will be given out.
b. when there is a reaction between Cao and water carbon dioxide is given out.
c.when there is a reaction between lead nitrate and Kl nitrogen dioxide is given out.
d.when there is a reaction between limestone and HCl carbon dioxide is given out.
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