Metallurgy + d & f block elements

Identify the incorrect statements related to lanthanons:

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.	Ce⁺⁴ solutions are widely used as oxidizing agents in volumetric analysis.

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO₄ for complex oxidation?
1. $F e S O_{4}$
2. $F e S O_{3}$
3. $F e C_{2} O_{4}$
4. $F e {(N O_{2})}_{2}$

3. Considering the following reaction,
3 MnO ₄^2–+ 2 H ₂ O ⇌ 2 MnO₄^– + MnO ₂+ 4 OH^–
The reagent that facilitates the removal of OH^– ions to ensure the completion of the conversion of K₂MnO₄ to KMnO₄ is:
1. KOH
2. CO₂
3. SO₂
4. HCl

Which one of the following is a mineral of iron?
1. Malachite
2. Cassiterite
3. Pyrolusite
4. Magnetite

Out of ${TiF}_{6}^{2 -}$ , ${CoF}_{6}^{3 -}$ , Cu₂Cl₂ and ${NiCl}_{4}^{2 -}$ (Z of Ti = 22, Co=27, Cu = 29, Ni= 28) the colourless species are:
1. $T i F_{6}^{2 -}$ $a n d$ $C o F_{6}^{3 -}$
2. $C u_{2} C l_{2}$ $a n d$ $N i C l_{4}^{2 -}$
3. $T i F_{6}^{2 -}$ $a n d$ $C u_{2} C l_{2}$
4. $C o F_{6}^{3 -}$ $a n d$ $N i C l_{4}^{2 -}$

Which one of the following ions is the most stable in an aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
1. $\text{Cr}^{3 +}$
2. $\text V^{3 +}$
3. $\text{Ti}^{3 +}$
4. $\text{Mn}^{3 +}$

When neutral or faintly alkaline $K M n O_{4}$ is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:
1. $I_{2}$
2. $I O_{4}^{-}$
3. $I O_{3}^{-}$
4. $I O^{-}$

Van Arkel method of purification of metals involves converting the metal to a
1. Volatile compound
2. Volatile unstable compound
3. Non-volatile stable compound
4. Non-volatile unstable compound

Which of the following hydrogen halides react with AgNO₃ to give a precipitate that dissolves in hyposolution?
(I) HCl
(II) HF
(III) HI
(IV) HBr
1. (III), (I), (II)
2. (I), (III), (IV)
3. (IV), (II), (I)
4. (II), (IV), (III)

10.

Four statements for Cr and Mn are given below:

(I)	Cr²⁺ and Mn³⁺ have the same electronic configuration.
(II)	Cr²⁺ is a reducing agent while Mn³⁺ is an oxidizing agent.
(III)	Cr²⁺ is an oxidizing agent while Mn³⁺ is a reducing agent.
(IV)	Both Cr and Mn are oxidizing agents.

The correct statements are:
1. (I), (III),(IV)
2. (I), (II)
3. (I), (II), and (IV)
4. (I), (IV)

11.

Why is HCl not used to make the medium acidic in oxidation reactions of KMnO₄ in acidic medium?
1. Both HCl and KMnO₄ act as oxidising agents.
2. KMnO₄ oxidises HCl into Cl₂ which is also an oxidising agent.
3. KMnO₄ is a weaker oxidising agent than HCl.
4. KMnO₄ acts as a reducing agent in the presence of HCl.

12.

Zone refining is based on the principle that ___________.
1. impurities of low boiling metals can be separated by distillation.
2. impurities are more soluble in molten metal than in solid metal.
3. different components of a mixture are differently adsorbed on an adsorbent.
4. vapors of the volatile compounds can be decomposed in pure metal.

13.

Galena Contains ZnS with PbS. Which of the following is used as depressant to stop ZnS to come with foam?
1. NaCN
2. Aniline
3. Pine Oil
4. H₂O

14.

In Ellingham diagrams of $∆_{r} G$ oxide formation versus T, which of the following graphs has negative slope?
1. C $\to$ CO
2. Fe $\to$ Fe₂O₃
3. Mg $\to$ MgO
4. All of the above

15.

In the metallurgy of copper, matte contains
1. Cu₂S + Cu₂O
2. Cu₂S + FeS
3. FeS + FeO
4. Cu₂O + FeO

16.

Which has highest melting point?

(1) Cr
(2) Fe
(3) Cu
(4) Mo

17.

The colour of KMnO₄ is due to

(1) d – d transition
(2) Charge transfer spectra
(3) Polarisation of ion
(4) p – d transition

18.

${Cr}_{2} O_{7}^{2 -} + X \overset{H^{+}}{\to} {Cr}^{3 +} + H_{2} O +$ oxidised product of X, X in the above reaction can't be
1. $C_{2} O_{4}^{2 -}$
2. ${Fe}^{2 +}$
3. ${SO}_{4}^{2 -}$
4. $S^{2 -}$

19.

The pair having similar magnetic moment is
1. ${Ti}^{3 +}, V^{3 +}$
2. ${Cr}^{3 +}, {Mn}^{2 +}$
3. ${Mn}^{2 +}, {Fe}^{3 +}$
4. ${Fe}^{2 +}, {Mn}^{2 +}$

20.

Which of the following is not an ore of copper?
1. Chalcopyrites
2. Malachite
3. Azurite
4. Epsomite

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