
An element reacts with hydrogen to form a compound A which on treatment with water liberates hydrogen gas. The element can be
A. Nitrogen
B. Chlorine
C. Selenium
D. Calcium
Answer
163.2k+ views
Hint: Hydrides of metals are basic in nature and hydrides of non-metals are acidic in nature, metal hydrides produce H- ions in the solution and non-metal hydrides produce H+ ions in the solutions.
Complete Step by Step Answer:
When elements react with hydrogen it results in the formation of hydride of that element. These hydrides can be basic or acidic in nature based on the nature of the element. If the element is more electropositive than hydrogen it will form a basic hydride as it will produce H- ions and if the element is more electronegative than hydrogen then it will form an acidic hydride as it will produce H+ ions.
Nitrogen produces ammonium hydroxide (NH4OH) when it reacts with water. When HCl reacts with water it produces H3O+ & Cl- ions. Selenium hydrides also do not produce H2 gas when it reacts with water. But Calcium Hydride reacts with water and forms H2 gas.
$Ca+H_2\rightarrow \ CaH_2$
$CaH_2+H_2O\rightarrow Ca{(OH)}_{2(aq)}+H_{2(g)} \uparrow$
Calcium is an alkaline earth metal that belongs to group II, so its electron affinity is much more than hydrogen cation. Calcium Hydride liberates H- ions in the solution and it’s basic in nature, when it reacts with water it forms Calcium Hydroxide an alkali and it vigorously liberates Hydrogen gas with some amount of energy in the form of heat.
Thus, Option (D) is correct.
Note: The structure of CaH2 is salt-like and it can be crystallised into cotunnite like structure. CaH2 is a desiccant that means it is used as a drying agent. All Hydrides of alkaline earth metals are basic in nature.
Complete Step by Step Answer:
When elements react with hydrogen it results in the formation of hydride of that element. These hydrides can be basic or acidic in nature based on the nature of the element. If the element is more electropositive than hydrogen it will form a basic hydride as it will produce H- ions and if the element is more electronegative than hydrogen then it will form an acidic hydride as it will produce H+ ions.
Nitrogen produces ammonium hydroxide (NH4OH) when it reacts with water. When HCl reacts with water it produces H3O+ & Cl- ions. Selenium hydrides also do not produce H2 gas when it reacts with water. But Calcium Hydride reacts with water and forms H2 gas.
$Ca+H_2\rightarrow \ CaH_2$
$CaH_2+H_2O\rightarrow Ca{(OH)}_{2(aq)}+H_{2(g)} \uparrow$
Calcium is an alkaline earth metal that belongs to group II, so its electron affinity is much more than hydrogen cation. Calcium Hydride liberates H- ions in the solution and it’s basic in nature, when it reacts with water it forms Calcium Hydroxide an alkali and it vigorously liberates Hydrogen gas with some amount of energy in the form of heat.
Thus, Option (D) is correct.
Note: The structure of CaH2 is salt-like and it can be crystallised into cotunnite like structure. CaH2 is a desiccant that means it is used as a drying agent. All Hydrides of alkaline earth metals are basic in nature.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main 2025 Session 2: Exam Date, Admit Card, Syllabus, & More

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
Types of Solutions

Degree of Dissociation and Its Formula With Solved Example for JEE

Classification of Drugs

Instantaneous Velocity - Formula based Examples for JEE

JEE Main Chemistry Question Paper with Answer Keys and Solutions

JEE Main Chemistry Online Mock Test for Class 12

Other Pages
Haloalkanes and Haloarenes

Alcohol Phenol and Ether Class 12 Notes: CBSE Chemistry Chapter 7

Coordination Compounds Class 12 Notes: CBSE Chemistry Chapter 5

NCERT Solutions for Class 12 Chemistry In Hindi Chapter 10 Haloalkanes and Haloarenes In Hindi Mediem

Total MBBS Seats in India 2025: Government College Seat Matrix

NEET Total Marks 2025: Important Information and Key Updates
