मराठी

A Small Piece of Calcium Metal is Put into a Small Trough Containing Water. There is Effervescence and White Turbidity is Formed. Write an Equation for the Reaction.

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प्रश्न

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

Write an equation for the reaction.

एका वाक्यात उत्तर
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उत्तर

Ca + 2H2O → Ca(OH)+ H2

The solution turns blue.

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Application of Activity Series in the Preparation of Hydrogen
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पाठ 6: Study of the First Element - Hydrogen - Exercise 6 (B) [पृष्ठ १०५]

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सेलिना Concise Chemistry [English] Class 9 ICSE
पाठ 6 Study of the First Element - Hydrogen
Exercise 6 (B) | Q 9.2 | पृष्ठ १०५

संबंधित प्रश्‍न

From the knowledge of activity series, name a metal which shows the following properties:

It displaces hydrogen from dilute HCl.


From the knowledge of activity series, name a metal which shows the following properties:

It forms a base which is insoluble in water. 


A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

What do you observe when a few drops of red litmus solution are added to the turbid solution.


Thin strips of magnesium, copper, and iron are taken.

Arrange these metals in descending order of reactivity. 


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. 


What do you observe when hydrogen gas is passed through a soap solution?


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.

  1. Name the substances A and B.
  2. Give two tests for the colourless liquid formed in the experiment.
  3. What happens to substance A when it reacts with hydrogen? Give reasons for your answer.
  4. Write an equation for the reaction between hydrogen and substance A.
  5. Is there any reaction between substance B and dilute hydrochloric acid? Give reasons for your answer.

Select the odd one out and justify your answer.

Fe, Pb, Al and Zn 


Helium is preferred to hydrogen for filling balloons because it is:


State why hydrogen is not prepared in the laboratory by the action of lead with dilute hydrochloric acid.


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