Chemistry
Upon reacting with water, an active metal produces
- oxygen
- nitric acid
- a base
- none of these.
Hydrogen
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Answer
a base
Reason — Active metals like potassium, sodium and calcium react with cold water forming their corresponding hydroxides (i.e., bases) and evolving hydrogen.
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Related Questions
When hydrogen is passed over a black solid compound A, the products are 'a colourless 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.
(a) Name the substances A and B.
(b) Give two tests for the colourless liquid formed in the experiment.
(c) What happens to substance A when it reacts with hydrogen ? Give reasons for your answer.
(d) Write an equation for the reaction between hydrogen and substance A.
(e) Is there any reaction between substance B and dilute hydrochloric acid ? Give reasons for your answer.
Helium is preferred to hydrogen for filling balloons because it is
- lighter than air
- almost as light as hydrogen
- non-combustible
- inflammable
A metal oxide that is reduced by hydrogen is:
- Al2O3
- CuO
- CaO
- Na2O
Which of the following statements about hydrogen is incorrect ?
- It is an inflammable gas
- It is the lightest gas.
- It is not easily liquefied.
- It is a strong oxidizing agent.