Assertion: To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange.

Reason : The colour change is due to the oxidation of potassium chromate.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Chemistry of Mn and Cr Compounds |
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Which one of the following statements is not correct

1. Nickel forms Ni(CO)4

2. All the transition metals form mono-metallic carbonyls

3. Carbonyl are formed by transition metals

4. Transition metals form complexes

Subtopic:  d-Block Elements- Properties & Uses |
 87%
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Which of the following pairs of compounds are more stable

(A) K2[NiCl6],[Pt(CN)4]2-

(B) NiCl4, PtCl4

(C) [Ni(CN)4]2-, K2[Pt(Cl6)]

(D) PtCl2, NiCl2

Subtopic:  d-Block Elements- Properties & Uses |
 69%
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The radius of La3+ (atomic number of La=57) is 1.06 Ao. Which one of the following given values will be closest to the radius of Lu3+ (atomic number of Lu =71)

(1) 1.60 Ao

(2) 1.40 Ao

(3)1.96 Ao

(4)0.85 Ao

Subtopic:  Lanthanoid & Actinoids Contraction |
 71%
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Match the underlined atom in Column A with oxidation number in Column B.

                    A                                                          B

(a)  [Fe(CN)5NO]2-                                                0(I)

(b)  [Ag(CN)2]-                                                      3(II)

(c)  [Cr(en)3]3+                                                      1(III)

(d)  Ni(CO)4                                                          2(IV)

              a         b        c       d

(A)         I         II       III      IV

(B)        II        III       IV       I

(C)       IV        III       II        I

(D)       II        III        I        IV

Subtopic:  d-Block Elements- Properties & Uses |
 73%
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By calculating Eo value of the following reaction,which one of the following reaction are spontaneous.

Given 

ECu2+/Cuo=0.34 V,EZn2+/Zno=-0.76 V, EAg+/Ago=0.80 V.
(a) 2Ag +Zn2+2Ag++Zn
(b)Cu +Zn2+Zn +Cu2+
(c) Zn +Cu2+Zn2++Cu
(d) 2Ag++Cu 2Ag+Cu2+

(A) Only d

(B) Only b

(C) Both c & d

(D) Both a & c

 

Subtopic:  d-Block Elements- Properties & Uses |
 69%
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Which of the following species has the highest number of unpaired electrons?

1. Fe2+

2. Fe3+

3. Co3+

4. Co2+

Subtopic:  d-Block Elements- Properties & Uses |
 80%
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The atomc number of potassium is 19 & that of manganese is 25. Although the colour of MnO4- is dark violet yet the K+ is colourless.This is due to the fact that

(1) Mn is a transition element; while K+ is not

(2) [MnO4]- is negatively charged; while K+ has a positive charge.

(3) The effective atomic number of Mn in [MnO4]- is 26; while for K+ , the atomic number s 18

(4) The Mn in a high positive oxidation state allow charge transfer transitions.

Subtopic:  Chemistry of Mn and Cr Compounds |
 61%
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Heating of Ag with dil. HNO3 give

1. NO

2. NO2

3. N2O

4. N2O3

Subtopic:  d-Block Elements- Properties & Uses |
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Zinc dissolve in an excess of NaOH, because of the formation of:

1. ZnO

2. Zn(OH)2

3. NaZn(OH)3

4. Na2ZnO2

Subtopic:  d-Block Elements- Properties & Uses |
 62%
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