Q. 165.0( 3 Votes )
A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O2, it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidizing agent.
(i) Identify A, B, C and D.
(ii) To which group of the periodic table, does this non-metal belongs?
The non-metal which is the largest constituent of air is Nitrogen.
When nitrogen is heated with hydrogen in the ratio of 1:3 in presence of iron as a catalyst we get ammonia as the product. This process of ammonia production is called as Haber’s process. The reaction is as follows:
N2 + 3H2→ 2NH3
When nitrogen is heated with oxygen, it gives nitrogen dioxide. The reaction is as follows:
N2 + 2O2→ 2NO2
When nitrogen dioxide is dissolved in water, it gives nitric acid which is a strong oxidizing agent. The reaction is as follows:
3NO2 + H2O → 2HNO3 + NO
(i) Therefore from above reactions we can easily state that,
A is Nitrogen
B is Ammonia
C is Nitrogen Dioxide
D is Nitric Acid
(ii) The non-metal that is nitrogen belongs to the group 15 of the periodic table.
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i. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
ii. What type of reaction is this?
iii. Write a balanced chemical equation to represent the above reaction.
A brown substance ‘X’ on heating in air forms a substance ‘Y’. When hydrogen gas is passed over heated ‘Y’, it again changes back into ‘X’.
i. Name the substance ‘X’ and ‘Y’
ii. Name the type of chemical reactions occurring during both the changes.
iii. Write the chemical equations of the reactions.Xam idea - Science