Hydrogen and its Compounds

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What is the common property of saline or ionic hydrides formed by the s-block metals?

They have covalent polymeric structure

They are non-volatile, non-conducting crystalline solids (correct)

They are volatile and conducting liquids

They have ionic bond with hydrogen

Which of the following is an example of molecular hydride?

CaH2

B2H6 (correct)

LiH

NaH

In the periodic table, which group of elements does not form hydrides?

Group 3, 4, and 5

Group 1 and 2

Group 6

Group 7, 8, and 9 (correct)

What is the order of thermal stability of 1 and 2 group hydrides?

LiH > NaH > KH > RbH > CsH Signup and view all the answers

What is the characteristic of metallic hydrides in their solid state?

They are good conductors of electricity Signup and view all the answers

What is the reaction of saline hydrides with water?

They react explosively with water Signup and view all the answers

What is the use of alkali metal hydrides?

They are used for making LiAlH4 and NaBH4 Signup and view all the answers

Which of the following is a characteristic of molecular hydrides?

Their stability decreases down the group Signup and view all the answers

What is the trend in stability of molecular hydrides in a period?

It increases with increasing electronegativity Signup and view all the answers

Which of the following elements does not form a hydride in group 6?

All of the above, except Cr Signup and view all the answers

What is a characteristic feature of electron rich molecular hydrides?

They have one or more lone pairs of electrons around the central more electronegative element Signup and view all the answers

Which of the following is an example of an electron precise molecular hydride?

CH4 Signup and view all the answers

What is the nature of the bonding in BeH2, MgH2, and LiH?

Covalent Signup and view all the answers

What is the reason for the difference in reaction rate between H2 and Cl2, and D2 and Cl2?

Isotopic effect Signup and view all the answers

What is the characteristic of hydrides formed by f-block metals?

Limiting composition Signup and view all the answers

What is the purpose of using H3PO4 in the industrial method of preparing H2O2?

As a preservative (negative catalyst) Signup and view all the answers

What is the term used for the method of removing permanent hardness using Na2Z (sodium zeolite)?

Ion Exchange Method Signup and view all the answers

What is the byproduct formed when MgSO4 reacts with Na2CO3 to remove permanent hardness?

Na2SO4 Signup and view all the answers

What is the term used for the method of removing temporary hardness using lime?

Removal of Temporary Hardness Signup and view all the answers

What is the industrial method of preparing H2O2?

By adding H2SO4 to sodium peroxide Signup and view all the answers

What is the reason for hard water not producing lather with soap?

Soap reacts with calcium and magnesium ions to form insoluble precipitates Signup and view all the answers

What is the type of hardness of water due to the presence of bicarbonates of calcium and magnesium?

Temporary hardness Signup and view all the answers

What is the process of removing hardness from water called?

Softening of water Signup and view all the answers

What is the nature of water in terms of its pH?

Neutral Signup and view all the answers

What is the property of water that allows it to act as both an acid and a base?

Amphoteric nature Signup and view all the answers

What happens to bicarbonates of Ca and Mg during boiling?

They decompose into insoluble carbonates and release CO2 Signup and view all the answers

What is the purpose of adding lime in Clark's method?

To remove temporary hardness Signup and view all the answers

Why is phosphoric acid preferred to sulphuric acid in the removal of temporary hardness?

It produces fewer soluble impurities Signup and view all the answers

What is the byproduct of the reaction between hydrated barium peroxide and sulphuric acid?

Barium sulphate Signup and view all the answers

What is the result of the reaction between Mg(HCO3)2 and heat?

MgCO3 + CO2 + H2O Signup and view all the answers