Question

Assertion:Nitrogen reacts with hydrogen to form ammonium hydroxide.
Reason:Reaction of nitrogen with hydrogen is endothermic
Which of the following options are correct?
A.Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B.Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
C.Assertion is correct but Reason is incorrect.
D.Both Assertion and Reason are incorrect

Answer 1

Endothermic reactions are the reactions that require energy to initiate the reaction involved. Unless we are not providing external energy to it the reaction does not occur, and hence absorbs energy to form the product.

Complete Step by step answer: Nitrogen is group 15 element and hence has five electrons in their outer shell. They exhibit a wide range of oxidation states. The tendency for the pair of s electrons to remain inert increases with increasing atomic weight.
Thus, only the p electrons are used in bonding and trivalency results. The hydrides are trivalent as well. In the question we are given that nitrogen reacts with hydrogen to form ammonium hydroxide which is wrong the reaction that takes place is:

${N_2} + 3{H_2} \to 2N{H_3}$

Hence formation of ammonia takes place, ammonia on further reaction with water forms ammonium hydroxide. Formation of ammonia synthetically from nitrogen and hydrogen is called a haber-bosch process. The process is exothermic as it releases energy to its surroundings. Ammonia is a colourless gas with a pungent odor. The gas is quite poisonous. It dissolves readily in water with evolution of heat.
The gas evolved can be detected by its characteristic smell, turning mist litmus paper blue and by forming yellow brown precipitate with nessler's reagent. Ammonia has a high boiling point and is much less volatile than expected is that it is hydrogen bonded in the liquid state. It can donate its lone pair of electrons quite strongly to form complexes.
Hence from the above discussion we can conclude that both the reason and assertion are incorrect.

Therefore the correct option is D.

Note: Nitrogen exhibits an oxidation state of (-III) in ammonia. All the hydrides formed by the elements of group-15 are poisonous, foul smelling gases and their stability decreases down the group. Nitrogen shows varying oxidation states so it is difficult to predict what could be the exact product.