JEE Main 2016 · 10 Apr · Shift 1 · Chemistry Q41

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ChemistrySingle correct+4 / -1Question 41 of 90

The following statements concern elements in the periodic table. Which of the following is true ?

All the elements in Group 17 are gases.

The Group 13 elements are all metals.

Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods.

For Group 15 elements, the stability of +5 oxidation state increases down the group.

Answer and worked solution

Official answer: C

Group 16 elements have lower first ionisation enthalpies than group 15, whose half-filled p subshell is extra stable. The others are false: bromine is a liquid and iodine a solid, boron is not a metal, and the +5 state becomes less stable down group 15 (inert-pair effect).

Topics:Periodic trends in properties Ionisation enthalpy

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JEE Main 2016 · 10 Apr · Shift 1, Chemistry question 41