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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
Hydrogen can be prepared with the metal zinc by using:
acid
Give an equation.
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.
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.
- 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
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:
Which metal gives hydrogen with all of the following: water, acids, alkalis?
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
Name the following.
A metal below iron but above copper in the activity series of metals which has no reaction with water.
