91.

The atomic numbers of elements A, B, C and D are Z - 1; Z; Z + 1 and Z + 2, respectively. If 'B' is a noble gas, choose the correct answers from the following statements-

1) 'A' has higher electron affinity.

(2) 'C' exists in +2 oxidation state. 

(3) 'D' is an alkaline earth metal.

• (1) and (2)

• (2) and (3)

• (1) and (3)

• (1), (2) and (3)

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

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:

• 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.

An element has [Ar] 3d¹ configuration in its +2 oxidation state. Its position in the periodic table is

• period - 3, group - 3

• penod - 3, group - 7

• period - 4, group - 3

• period - 3, group - 9