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प्रश्न
Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
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उत्तर
Potassium and sodium react violently with acid. Hence, potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
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संबंधित प्रश्न
From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from dilute HCl.
Complete the following word equation:
Calcium + water → calcium hydroxide + _________
Thin strips of magnesium, copper, and iron are taken.
Write down what happens when these metals are treated as follows:
- Heated in presence of air
- Heated with dil.HCl
- Added to an aqueous solution of zinc sulphate.
Which metal is preferred for collecting hydrogen from Cold water? Write the balanced equation.
Name two alkalies that can displace hydrogen. Give balanced equations for the same. Why are the metals you have used considered to have a unique nature?
When hydrogen is passed over a black solid compound A, the products are a 'colorless liquid' and a 'reddish-brown metal B'.
Substance B is divided into two parts each placed in separate test tubes.
Dilute HCl is added to one part of substance B and dilute HNO3 to the other.
- Name the substances A and B.
- Give two tests for the colourless liquid formed in the experiment.
- What happens to substance A when it reacts with hydrogen? Give reasons for your answer.
- Write an equation for the reaction between hydrogen and substance A.
- Is there any reaction between substance B and dilute hydrochloric acid? Give reasons for your answer.
Correct the following statement:
Conc. H2SO4 reacts with zinc to liberate hydrogen.
State why hydrogen is not prepared in the laboratory by the action of calcium with dilute sulphuric acid.
State why hydrogen is not prepared in the laboratory by the action of lead with dilute hydrochloric acid.
Name the following.
The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis.
