Chemistry Class-11: Chapter –9. Hydrogen Part – 7

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V. Assertion and Reason Type

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.

Question: 67

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.

Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.

(i) Statements A and R both are correct and R is the correct explanation of A.

(ii) A is correct but R is not correct.

(iii) A and R both are correct but R is not the correct explanation of A.

(iv) A and R both are false.

Answer: (i)

Question: 68

Assertion (A): Some metals like platinum and palladium, can be used as storage media for hydrogen.

Reason (R): Platinum and palladium can absorb large volumes of hydrogen.

(i) Statements A and R both are correct and R is the correct explanation of A.

(ii) A is correct but R is not correct.

(iii) A and R both are correct but R is not the correct explanation of A.

(iv) A and R both are false.

Answer: (i)

VI. Long Answer Type

Question: 69

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.

Answer:

Question: 70

How can be prepared from water? Mention the physical properties in which differs from . Give at least three reactions of showing the exchange of hydrogen with deuterium.

Question: 71

How will you concentrate ? Show differences between structures of and by drawing their spatial structures. Also mention three important uses of .

Answer:

Question: 72

(i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.

(ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.

Question: 73

What mass of hydrogen peroxide will be present in of a solution? Calculate the mass of oxygen which will be liberated by the decomposition of of this solution.

Answer:

68 g, 3.2 g

Question: 74

A colourless liquid ‘A’ contains H and O elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.

(i) Suggest possible structure of A.

(ii) Write chemical equations for its decomposition reaction in light.

Answer:

Question: 75

An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with .

Answer:

Question: 76

Sodium forms a crystalline ionic solid with dihydrogen. The solid is nonvolatile and non- conducting in nature. It reacts violently with water to produce dihydrogen gas. Write the formula of this compound and its reaction with water. What will happen on electrolysis of the melt of this solid.

Answer:

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