Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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Solution

Potassium and sodium are very reactive metals, and they reacts with acid very quickly and explosively.
Therefore, use of potassium and sodium to produce hydrogen is very dangerous due to the explosive nature of the reaction.

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Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Copy and complete the following table. Column 3 has the names of gases to be prepared using the substance you enter in Column 1, alongwith dilute or concentrated sulphuric acid, as indicated in Column 2.

Column 1	Column 2	Column 3
Substance reacted with acid	Dilute or concentrated sulphuric acid	Gas
		hydrogen
		carbon dioxide
		only chlorine

Write the equation for the laboratory preparation of:
(i) Sodium sulphate using dilute sulphuric acid.
(ii) Lead sulphate using dilute sulphuric acid.

Explain, why silver nitrate crystals are dissolved in distilled water and not in tap water to prepare silver nitrate solution as a laboratory reagent.
Give one chemical test to distinguish between dilute hydrochloric acid and dilute sulphuric acid.

Q. Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen. Explain why?

Q. Give reason for the following:
Though lead is above hydrogen in the reactivity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

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Strength of Acids and Bases

Standard X Chemistry

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Give reason for the following:​ Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.​

Potassium and sodium are very reactive metals, and they reacts with acid very quickly and explosively. Therefore, use of potassium and sodium to produce hydrogen is very dangerous due to the explosive nature of the reaction.​

Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Potassium and sodium are very reactive metals, and they reacts with acid very quickly and explosively.
Therefore, use of potassium and sodium to produce hydrogen is very dangerous due to the explosive nature of the reaction.