Question

Roll no
Q. NO. 1) Describe the following chemical reactions giving their balanced equations :
Subject Science & Technology
1. Sodium hydroxide react with dilute hydrochloric acid.
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2.Baking soda react with dilute hydrochloric acid.
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3.Bleaching powder is exposed to air.
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4.When dry slaked lime reacts with chlorine gas.
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5.Crystalline sodium carbonate reacts with sulphuric acid.
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Answer 1

Answer:

1. Hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water. Sodium chloride is made up of Na+ cations from the base (NaOH) and Cl- anions from the acid (HCl). HCl+NaOH→H2O+NaCl.

2. When baking soda reacts with dilute hydrochloric acid, it produces sodium chloride, water and releases carbon dioxide gas with more effervescence. Reaction: NaHCO3 (s) + HCl(aq) --------> NaCl(aq) + H2O (l) + CO2(g).

3. Bleaching powder is a yellowish white powder with a strong smell of chlorine. When exposed to air, bleaching powder gives a smell of chlorine. This is because bleaching powder reacts with carbon dioxide from the atmosphere to produce calcium carbonate and chlorine.

4. When dry chlorine gas is passed over the dry slaked lime, calcium oxychloride is formed. The common name of calcium oxychloride is Bleaching powder. It is also known as Calcium hypochlorite. The chemical formula of bleaching powder is Ca(OCl)2.

Answer 2

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