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MCQs on Classification of Elements and Periodicity in Properties
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MCQs on Classification of Elements and Periodicity in Properties
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1. The formation of the oxide ion, O2– (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below:

Thus process of formation of O2– in gas phase is unfavourable even though O2– is isoelectronic with neon. It is due to the fact that,
2. Which of the following is not an actinoid?
3. Which of the following is not an actinoid?
4. The statement that is not correct for periodic classification of elements is:
5. Among halogens , the correct order of amount of energy released in electron gain (electron gain enthalpy) is:
6. Electronic configurations of four elements A, B, C and D are given below :
(A) 1s2 2s2 2p6
(B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1
(D) 1s2 2s2 2p5 (br>Which of the following is the correct order of increasing tendency to gain electron :
7. Among halogens , the correct order of amount of energy released in electron gain (electron gain enthalpy) is:
8. Consider the isoelectronic species, Na+, Mg2+, F– and O2-. The correct order of increasing length of their radii is\r\n
9. The formation of the oxide ion, O2– (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below:

Thus process of formation of O2– in gas phase is unfavourable even though O2– is isoelectronic with neon. It is due to the fact that,
10. The elements in which electrons are progressively filled in 4f-orbital are called
11. Consider the isoelectronic species, Na+, Mg2+, F– and O2-. The correct order of increasing length of their radii is\r\n
12. Electronic configurations of four elements A, B, C and D are given below :
(A) 1s2 2s2 2p6
(B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1
(D) 1s2 2s2 2p5 (br>Which of the following is the correct order of increasing tendency to gain electron :

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