Which of the following statement is correct for 3d-transition element?

1. All metals except Zn and Sc form 'MO' Oxide

2. All metals except Sc forms 'MO' Oxide

3. All metals except Zn forms 'MO' Oxide

4. All metals except Mn forms 'MO' Oxide

the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

1. their magnetic behaviour

2. their unfilled d orbitals

3. their ability to adopt variable oxidation states

4. their chemical reactivity

The highest possible oxidation state shown by osmium in its compound is

1. +4

2. +6

3. +8

4. +10

1. Which of the following compounds is colourless?

   1. Fe³⁺

   2. Ti⁴⁺

   3. Co²⁺

   4. Ni²⁺

2. Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is

   1. Ti

   2. Cu

   3. Mn

   4. Zn

The general electronic configuration of 4f series of elements can be written as ___________

1. [Xe]4f^2-14 5d^0-46s²

2. [Xe]4f^2-145d^0-46s¹

3. [Xe] 4f^1-145⁰6s¹

4. [Xe]4f^2-145d^0-46s¹

Identify the paramagnetic species

1. Cu⁺

2. Cr⁺

3. MnO₄

4. Zn²⁺

In chromyl chloride test, A ___________ precipitate of lead chromate is obtained.

1. White

2. red

3. yellow

4. blue

Oxygen stabilises higher oxidation state because

1. it is electronegative

2. of its tendency to form multiple bond

3. of large size

4. of small size

Which of the following ions will exhibit colour inaqueous solutions?

1. SC³⁺(Z=21)

2. Ti³⁺(Z =22)

3. La³⁺(Z=57)

4. Lu³⁺(Z=71)

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

1. presence of unpaired electrons

2. energy gap between two energy levels is very small

3. both (a) and (b)

4. neither (a) nor (b)

FeSO₄ on heating gives ____________

1. SO_² and O₂

2. SO₂ and SO₃

3. SO₂

4. SO₃

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

1. Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

2. Ce⁴⁺ and Yb²⁺ acquire f⁰ configuration

3. Ce⁴⁺ and Yb²⁺acquire f⁷ and f¹⁴ configuration

4. Ce⁴⁺and Yb²⁺ acquire f⁰ and f¹⁴ configuration

Value of magnetic moment of a divalent metal ion is, 5.92 BM. Total number of electron in its atom would be ______________

1. 24

2. 25

3. 26

4. 27

The number of moles of acidified KMnO₄ required to oxidize 1 mole of ferrous oxalate(FeC₂O₄) is

1. 5

2. 3

3. 0.6

4. 1.5

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

1. high lE₁ + E₂

2. high hydration energy

3. ΔH atomisation

4. Electronic configuration of Ni²⁺

The trend in ionisation enthalpy of a transition element is not regular because,

1. removal of one electron alters the relative energies of 4s and 3d orbitals

2. due to different electronic configuration (stability)

3. Poor screening of 3p-orbital

4. due to decrease in effective nuclear charge

Of these statement, which statement is incorrect in most of the transition elements are _____________

1. hexagonal close packed

2. cubic close packed

3. face centered cubic

4. symmetrical distribution

The most common oxidation state of actinoids is

1. +2

2. +3

3. +4

4. +6

1. Which of the following does not give oxygen on heating?

   1. K₂Cr₂O₇

   2. (NH₄)₂Cr₂O₇

   3. KClO₃

   4. Zn(ClO₃)₂

2. Which one of the following ions has the same number of unpaired electrons as present in V³⁺?

   1. Ti³⁺

   2. Fe³⁺

   3. Ni²⁺

   4. Cr³⁺

Except ______________ all element from Rf to Cn, are synthetically prepared and have very low half life periods.

1. cadmium

2. actinium

3. yttrium

4. cadmium

Which of the following statements is not true?

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

2. Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

3. K₂Cr₂O₇ solution in acidic medium is orange in colour

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

The common oxidation state of lanthanonids is _________

1. +3

2. -3

3. 0

4. +2

In black and white photography, the developed film is fixed by washing with ____________

1. Hypo solution

2. AgBr solution

3. Na₂S₄O₆ solution

4. FeC₂O₄ solution

Which of the following lanthanoid ions is diamagnetic?

1. Eu²⁺

2. Yb²⁺

3. Ce²⁺

4. Sm²⁺

The reaction of aqueous KMnO₄ with H₂O₂ in acidic condition gives

1. Mn⁴⁺ and MnO₂

2. Mn⁴⁺ and O₂

3. Mn₂₊ and O₂

4. Mn₂₊ and O₃

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

1. Na₂SO₃, SO₂, Cr₂(SO₄)₃

2. Na₂S₂O₃, SO₂, Cr₂(SO₄)₃

3. Na₂S, SO₂,Cr₂(SO₄)₃

4. Na₂SO₄, SO₂, Cr₂(SO₄)₃

How many moles of I₂ are liberated when 1 mole of potassium dichromate react with potassium iodide

1. 1

2. 2

3. 3

4. 4

Which of the following oxidation states is most common among the lanthanoids?

1. 4

2. 2

3. 5

4. 3

CrO₃ is coloured due to

1. Low l.E

2. Crystal defects

3. Charge transfer spectra

4. Unpaired electrons

Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

1. both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds

2. in case of Sc, 3d orbital are partially filled but in Zn these are completely filled

3. last electron as assumed to be added to 4s level in case of zinc

4. both Sc and Zn do not exhibit variable oxidation states

Coinage metals are _________

1. normal metals

2. transition metals

3. active metals

4. alkali metals

_________ is known as Bayer's reagent.

1. Hot dilute alkaline KMnO₄

2. Cold dilute alkaline KMnO₄

3. Hot Conc. acidic KMnO₄

4. Cold Conc. acidic KMnO₄

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

1. [Noble gas]n - 1d^1-10 ns^1-2

2. [Noble gas]n - 1d^-10 n^1-6

3. [Noble gas]n - 2 d¹⁰ ns^1-2

4. [Noble gas]n - 2 d¹⁰ ns^1-6

The electronic configuration of Sc is _____________

1. [Ar] 3d¹ 4s²

2. [Ar] 3d² 4S¹

3. [Ar] 3d⁵ 4S¹

4. [Ar] 3d³ 4S¹

Acidified solution of chromic acid on treatment with H₂O₂ give blue colour which is due to ____________

1. CrO₃ + H₂O + O₂

2. H₂Cr₂O₇+ H₂O + CO₂

3. Cr₂O₃ + H₂O + O₂

4. CrO₅ + H₂O

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

1. Neptunium

2. Plutonium

3. Uranium

4. Americium

The catalytic activity of transition metals is due to

1. the formation of a variety of oxidation states

2. the formation of intermediate products

3. the capability of forming interstitial compounds.

4. all the above

Sometimes vessels made of copper or bronze show traces of green colour. This is due to the formation of ___________________

1. Cu(OH)₂

2. CuCO₃

3. Cu(OH)₂CuCO₃

4. Cu(OH)₂CuSO₄

If the standard electrode potential (E^o) of a inetal is ____________ and ______________ the metal is a powerful reducing agent.

1. large, negative

2. large, positive

3. small, negative

4. small, positive

On oxidation with KMnO₄ in acidic medium, SO₂ is oxidised to ___________

1. SO₂

2. H₂SO₄

3. SO₃^2-

4. H₂S

The alloy of copper that contain Zinc is

1. Monel metal

2. Bronze

3. bell metal

4. brass

Identify the correct reason for lanthanide contraction

1. Decreasing nuclear charge

2. Decreasing screening effect

3. Increasing nuclear charge

4. Negligible screening effect

1. In acid medium, potassium permanganate oxidizes oxalic acid to

   1. oxalate

   2. Carbon dioxi

   3. acetate

   4. acetic acid

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

   1. Cr

   2. Pd

   3. Pt

   4. none of these

Equivalent weight of KMnO₄ in acidic medium is ___________

1. 3.16

2. 31.6

3. 158

4. 52.67

Which of the following is coloured due to charge transfer?

1. MnO₄^-

2. CrO₄^2-

3. Cu₂O

4. All of these

Permanganate ion changes to ________ in acidic medium

1. MnO₄²⁻

2. Mn²⁺

3. Mn³⁺

4. MnO₂

Which one of the following exhibits highest oxidation state?

1. Ni

2. Mn

3. V

4. Zr

Hybridisation of chromium ions and dichromate ions is

1. Sp²

2. Sp³d

3. both (a) and (b)

4. None of these

The correct statement is,

1. Cu2Cl₂ and Ag₂S are coloured

2. Upon strong heating paramagnetic gases are evolved by NaNO₃ and AgNO₃

3. Green vitriol and blue vitriol are isomorphus

4. KMnO₄ and K₂Cr₂O₇ are coloured due to

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

1. Np, Pu ,Am

2. U, Fm, Th

3. U, Th, Md

4. Es, No, Lr

The magnetic moment of Mn²⁺ ion is

1. 5.92BM

2. 2.80BM

3. 8.95BM

4. 3.90BM

Which one of the following statements related to lanthanons is incorrect?

1. Europium shows +2 oxidation state

2. The basicity decreases as the ionic radius decreases from Pr to Lu.

3. All the lanthanons are much more reactive than aluminium

4. Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis.

Which of the following is wrong with respect to lanthanide contraction?

1. Decrease in ionic radii

2. Increase in tendency to act as reducing agents

3. Decrease in basic character

4. Resembles second and third row of d-block elements

Which one of the following is not correct?

1. La(OH)₂ is less basic than Lu(OH)₃

2. In lanthanoid series ionic radius of Ln³⁺ ions decreases

3. La is actually an element of transition metal series rather than lanthanide series

4. Atomic radii of Zr and Hf are same because of lanthanide contract

A mixture of TiCl₄ and trialkyl aluminium is _________

1. hydroformylation of obfine

2. Zeigler - Natta Catalyst

3. interstitial compounds

4. ferromagnetic

Which of the following is not coloured?

1. Mn²⁺

2. Zn²⁺

3. Cr³⁺

4. Cu²⁺

The colour of K₂Cr₂O₇ and Fe²⁺ ions are respectively due to

1. Crystal defects and charge transfer spectra

2. d-d transition and charge transfer spectra

3. Charge transfer spectra and crystal defects

4. Charge transfer spectra and d-d transition

When a brown compound of Mn (A) ids 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

1. MnO₂, Cl₂ , NCl₃

2. MnO, Cl₂ , NH₄Cl

3. Mn₃O₄, Cl₂ , NCl₃

4. MnO₃, Cl₂ , NCl₂

Assertion : Ce⁴⁺ is used as an oxidizing agent in volumetric analysis.
Reason: Ce⁴⁺ has the tendency of attaining +3 oxidation state.

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

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

3. Assertion is true but reason is false.

4. Both assertion and reason are false.

The landthanide contraction is responsible for the fact that

1. Zr and Zn have the same oxidation state

2. Zr and Hf have almost the same radius

3. Zr and Nb have similar oxidation state

4. Zr and Y have similar radius