A metal M and its compound can give the following observable changes in a consequence of reactions

HNO3dilute [Colourless solutions] NaOHaqueous [White precipitate] NaOH (aq)excess [Colourless solutions] H2S [White precipitate]

(1) Mg     

(2) Pb   

(3) Zn   

(4) Sn

 

Subtopic:  d-Block Elements- Properties & Uses |
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Which two sets of reactants best represent the amphoteric character of Zn(OH)2?

Set 1: Zn(OH)2(s)  and OH-(aq)

Set 2: Zn(OH)2(s) and H2O(l)

Set 3: Zn(OH)2(s) and H+(aq)

Set 4: Zn(OH)2(s) and NH3(aq)

(a) 1 and 2       (b) 1 and 3     (c) 2 and 4     (d) 3 and 4

Subtopic:  d-Block Elements- Properties & Uses |
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Which compound is formed when iron reacts with carbon?

(1) FeC2       

(2) Fe3C     

(3) FeC3   

(4) Fe2C

Subtopic:  d-Block Elements- Properties & Uses |
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(X)+K2CO3+Airheat(Y)
(Y)+Cl2(Z)Pink

Which of the following is correct?

(a) X= black, MnO2,Y=Blue, K2CrO4, Z = KMnO4

(b) X= green, Cr2O3, Y=Yellow ,K2CrO4, Z = K2Cr2O7

(c) X= black, MnO2, Y = green, K2MnO4, z = KMnO4

(d) x = black, Bi2O3, Y = Colourless, KBiO2, z = KBiO3

Subtopic:  d-Block Elements- Properties & Uses |
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Consider the following transformation:

2CuX2Room temperature2CuX+X2

Then X- can be:

(1) F-, Br-                         

(2) Cl-,Br-

(3) CN-,I-                         

(4) Cl-,F-

Subtopic:  d-Block Elements- Properties & Uses |
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Acidified permanganate solution does not oxidize:

(1) C2O42-(aq)                   

(2) NO2-(aq)

(3) S2-(aq)                         

(4) F-(aq)

Subtopic:  Chemistry of Mn and Cr Compounds |
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Which of the following statements is incorrect?

1. Transition elements exhibit higher enthalpies of atomization as they have stronger interatomic interaction.
2. IE2 of V23<Cr24>Mn25 and Ni28<Cu29>Zn30.
3. Ni(II) compounds are more stable than Pt(II) whereas Pt(IV) compounds are more stable than nickel(IV)
4. The elements which give the greatest number of oxidation states do not occur in or near the middle of the series.

Subtopic:  d-Block Elements- Properties & Uses |
 76%
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Which of the following is true for the species 3d4 configuration ?

(1) Cr2+ is reducing in nature                               

(2) Mn3+ is oxidising in nature.

(3) Both (A) and (B)                                             

(4) None of these

Subtopic:  d-Block Elements- Properties & Uses |
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In which compound does vanadium have an oxidation number of +4?

(A) NH4VO2                                 

(B) K4VCN6

(C) VSO4                                     

(D) VOSO4

Subtopic:  d-Block Elements- Properties & Uses |
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Among the following, the species that is both paramagnetic and coloured is :

(A) MnO42-                                     

(B) TiCl62- 

(C) VO43-                                       

(D) CrO2Cl2

Subtopic:  d-Block Elements- Properties & Uses |
 73%
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