Which of the following is a favourable factor for cation formation?

• High electronegativity

• High electron affinity

• Low ionisation potential

• Smaller atomic size

Observe the following statements :

I. The physical and chemical properties of elements are periodic functions of their electronic configuration.

II. Electronegativity of fluorine is less than the electronegativity of chlorine.

III. Electropositive nature decreases from top to bottom in a group.

The correct answer is :

• I, II and III are correct

• only I is correct

• only I and II is correct

• only II and III are correct

The correct order of reducing abilities of hydrides of V group elements is

• NH₃ < PH₃ < AsH₃ < SbH₃ < BiH₃

• NH₃ > PH₃ > AsH₃ > SbH₃ > BiH₃

• NH₃ < PH₃ > AsH₃ > SbH₃ > BiH₃

• SbH₃ > BiH₃ > AsH₃ > NH₃ > PH₃

84.

A radioactive substance ₈₈X²²⁸ (IIA) emit 3α and 3β particles to form "Y". To which group of long form of the periodic table does "Y" belong ?

• IVA

• VA

• VIA

• VIIA

Which one of the following order is correct for the first ionisation energies of the elements?

• B < Be < N < O

• Be < B < N < O

• B < Be < O < N

• B < O < Be < N

Which one of the following is correct order of second ionisation potential of Na, Ne, Mg and Al?

• Al < Na < Mg < Ne

• Ne < Al < Na < Mg

• Mg < Al < Ne < Na

• Na < Mg < Ne < Al

The number of elements present in the fourth period is

• 32

• 8

• 18

• 2

Identify the most acidic oxide among the following oxides based on their reaction.

• SO₃

• P₄O₁₀

• Cl₂O₇

• N₂O₅

Match the following:

List - I	List - II
A. Rubidium	1. Germanium
B. Platinum	2. Radioactive chalcogen
C. Eka-silicon	3. s-block element
D. Polonium	4. Atomic number 78

• A - 4; B - 3; C - 2; D - 1

• A - 3; B - 4; C - 1; D - 2

• A - 2; B - 1; C - 4; D - 3

• A - 4; B - 3; C - 1; D - 2

Identify the correct statement.

• Lead forms compounds in +2 oxidation state due to inert pair effect.

• All halogens show only negative oxidation state.

• Catenation property increases from boron to oxygen.

• Oxadation state of oxygen is - 1 in ozonides.