DIRECTION : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer the question from the following four options.

Statement-1 :Superoxides of alkali metals are paramagnetic.
Statement-2 :Superoxides contain the ion \(O_{2}^{-}\) which has one unpaired electron

DIRECTION : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer the question from the following four options.

Statement-1 :Mg continue to burn in nitric oxide
Statement-2 :During burning, heat evolved do not decompose NO.

DIRECTION : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer the question from the following four options.

Statement-1 :Sulphate is estimated as BaSO₄ and not as MgSO₄.
Statement-2 :Ionic radius of Mg²⁺ is smaller than that of Ba²⁺

DIRECTION : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer the question from the following four options.

Statement-1 :LiCl is predominantly a covalent compound.
Statement-2 :Electronegativity difference between Li and Cl is too small

DIRECTION : These are Assertion-Reason type questions. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer the question from the following four options.

Statement-1 :Potassium and caesium are used in photoelectric cells.
Statement-2 :Potassium and caesium emit electrons on exposure to light.

DIRECTION : Read the passage given below and answer the questions that follow :The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate,the sodium chloride is used as starting material.
Which of the product is not correctly matched with its manufacture process?

DIRECTION : Read the passage given below and answer the questions that follow :The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate,the sodium chloride is used as starting material.

Highly pure solution of sodium in liquid ammonia at -33°C -(select correct statement) :

DIRECTION : Read the passage given below and answer the questions that follow :The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate,the sodium chloride is used as starting material.

The following compounds have been arranged in the order of their increasing thermal stabilities. Identify the correct order, K₂CO₃ (I), Na₂CO₃ (II), Rb₂CO₃ (III), Li₂CO₃ (IV)

Which of the following on thermal decomposition yields a basic as well as acidic oxide ?

What is the best description of the change that occurs when Na₂O(s) is dissolved in water ?