Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

(a)

Cr

(b)

Pd

(c)

Pt

(d)

none of these

Which of the following compounds is colourless?

(a)

Fe³⁺

(b)

Ti⁴⁺

(c)

Co²⁺

(d)

Ni²⁺

The correct order of increasing oxidizing power in the series _______.

(a)

VO₂⁺ < Cr₂O₇^2- < MnO₄^-

(b)

Cr₂O₇^2- < VO₂⁺ < MnO₄^-

(c)

Cr₂O₇^2- < MnO₄^- < VO₂⁺

(d)

MnO₄^- < Cr₂O₇^2- < VO₂⁺

Which of the following does not give oxygen on heating?

(a)

K₂Cr₂O₇

(b)

(NH₄)₂Cr₂O₇

(c)

KClO₃

(d)

Zn(ClO₃)₂

Which of the following statements is not true?

(a)

on passing H₂S, through acidified K₂Cr₂O₇ solution, a milky colour is observed

(b)

Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

(c)

K₂Cr₂O₇ solution in acidic medium is orange in colour

(d)

K₂Cr₂O₇ solution becomes yellow on increasing the P^H beyond 7

A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H₂SO₄ to a green coloured solution(C).  A, B and C are respectively ________.

(a)

Na₂SO₃, SO₂, Cr₂(SO₄)₃

(b)

Na₂S₂O₃, SO₂, Cr₂(SO₄)₃

(c)

Na₂S, SO₂, Cr₂(SO₄)₃

(d)

Na₂SO₄, SO₂, Cr₂(SO₄)₃

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH₃ to give an explosive compound (C). The compound A, B and C are ________.

(a)

MnO₂, Cl₂, NCl₃

(b)

MnO, Cl₂, NH₄Cl

(c)

Mn₃O₄, Cl₂, NCl₃

(d)

MnO₃, Cl₂, NCl₂

Which of the following lanthanoid ions is diamagnetic?

(a)

Eu²⁺

(b)

Yb²⁺

(c)

Ce²⁺

(d)

Sm²⁺

Assertion: Ce⁴⁺ is used as an oxidizing agent in volumetric analysis.
Reason: Ce⁴⁺ has the tendency of attaining +3 oxidation state.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false.
d) Both assertion and reason are false.

(a)

Both assertion and reason are true and reason is the correct explanation of assert

(b)

Both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

Assertion is true but reason is false.

(d)

Both assertion and reason are false.

The actinoid elements which show the highest oxidation state of +7 are _______.

(a)

Np, Pu, Am

(b)

U, Fm, Th

(c)

U, Th, Md

(d)

Es, No, Lr

Most of the transition metal ions are coloured, because of the ________.

(a)

presence of unpaired electrons

(b)

energy gap between two energy levels is very small

(c)

both (a) and (b)

(d)

neither (a) nor (b)

Hybridisation of chromium ions and dichromate ions is ________.

(a)

Sp²

(b)

Sp³d

(c)

both (a) and (b)

(d)

None of these

Identify the paramagnetic species.

(a)

Cu⁺

(b)

Cr⁺

(c)

MnO₄

(d)

Zn²⁺

Oxygen stabilises higher oxidation state because_______.

(a)

it is electronegative

(b)

of its tendency to form multiple bond

(c)

of large size

(d)

of small size

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.

(a)

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

(b)

Ce⁴⁺ and Yb²⁺ acquire f⁰ configuration

(c)

Ce⁴⁺ and Yb²⁺acquire f⁷ and f¹⁴ configuration

(d)

Ce⁴⁺and Yb²⁺ acquire f⁰ and f¹⁴ configuration

The lanthanide contraction is responsible for the fact that _______.

(a)

Zr and Zn have the same oxidation state

(b)

Zr and Hf have almost the same radius

(c)

Zr and Nb have similar oxidation state

(d)

Zr and Y have similar radius

Identify the correct reason for lanthanide contraction.

(a)

Decreasing nuclear charge

(b)

Decreasing screening effect

(c)

Increasing nuclear charge

(d)

Negligible screening effect

Electrode potential of M²⁺/M for Ni is abnormal because of ________.

(a)

high lE₁ + E₂

(b)

high hydration energy

(c)

ΔH atomisation

(d)

Electronic configuration of Ni²⁺

The general electronic configuration of d-block elements can be written as ________.

(a)

[Noble gas]n - 1d^1-10 ns^1-2

(b)

[Noble gas]n - 1d^-10 n^1-6

(c)

[Noble gas]n - 2 d¹⁰ ns^1-2

(d)

[Noble gas]n - 2 d¹⁰ ns^1-6

The element corresponding to the electronic configuration [Rn]5f³ 6d¹7s² is _________

(a)

Neptunium

(b)

Plutonium

(c)

Uranium

(d)

Americium