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प्रश्न
Complete the following word equation:
Calcium + water → calcium hydroxide + _________
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उत्तर
Calcium + water → calcium hydroxide + hydrogen
संबंधित प्रश्न
From the knowledge of activity series, name a metal which shows the following properties
It reacts readily with cold water
Thin strips of magnesium, copper, and iron are taken.
Arrange these metals in descending order of reactivity.
Choose the correct option:
Hydrogen is evolved by the action of cold dil. HNO3 on
Based on the reactions of water on metals, arrange the following metals in increasing order of reactivity: iron, sodium, magnesium, zinc, calcium
Write a balanced equation for the reaction named metal with (i) boiling water (ii) steam.
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.
Select the odd one out and justify your answer.
Fe, Zn, Cu and Mg
Helium is preferred to hydrogen for filling balloons because it is:
Choose terms from the options given in brackets to complete this sentence.
Sodium ………………. reacts smoothly with cold water.
(metal, amalgam, in the molten state)
State why hydrogen is not prepared in the laboratory by the action of calcium with dilute sulphuric acid.
