Chemistry Class-11: Chapter –3. Classification of Elements and Periodicity in Properties-Part – 8

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Question: 48

Assertion (A): Electron gain enthalpy becomes less negative as we go down a group.

Reason (R): Size of the atom increases on going down the group and the added electron would be farther from the nucleus.

(i) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(ii) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(iii) Assertion and reason both are wrong statements.

(iv) Assertion is wrong statement but reason is correct statement.

Answer: (iv)

VI. Long Answer Type

Question: 49

Discuss the factors affecting electron gain enthalpy and the trend in its variation in the periodic table.

Question: 50

Define ionisation enthalpy. Discuss the factors affecting ionisation enthalpy of the elements and its trends in the periodic table.

Question: 51

Justify the given statement with suitable examples— “the Properties of the elements are a periodic function of their atomic numbers”.

Question: 52

Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?

Question: 53

Write the drawbacks in Mendeleev’s periodic table that led to its modification.

Question: 54

In what manner is the long form of periodic table better than Mendeleev’s periodic table? Explain with examples.

Question: 55

Discuss and compare the trend in ionisation enthalpy of the elements of group1 with those of group17 elements.