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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. - Chemistry

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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
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
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

Give an equation to express the reaction between:

Steam and red hot iron


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

Name the gas formed in the reaction. How would you test the gas?


Hydrogen is obtained by displacement from:

  1. dilute sulphuric acid
  2. dilute hydrochloric acid

Write equations using zinc and iron.
Why does copper not show similar behavior?


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. 


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.

Zn, Fe, Mg, and Na


Select the odd one out and justify your answer.

SO2, H2S, NH3, and CO3


Select the odd one out and justify your answer.

Fe, Zn, Cu and Mg


Using dilute sulphuric acid how would you differentiate between:

Copper and magnesium

How would you identify the gaseous products evolved.


‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.


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