Which of the following products are formed when potassium bromide reacts with potassium permanganate in alkaline pH?

1. BrO3, MnO2                                     

2. BrO4, Mn2+

3. Br2, MnO2                                         

4. B2O, MnO42

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
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Assertion : The number of unpaired electrons in the following gaseous ions:

                   Mn3+, Cr3+, V3+ and Ti3+ are 4, 3, 2 and 1 respectively

Reason : Cr3+ is stable in aqueous solution.

  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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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Assertion : Cuprous ion Cu+ is colourless whereas cupric ion Cu2+ produces blue colour in solution.

Reason : Cuprous ion Cu+ has unpaired electrons while cupric ion Cu2+ does not.

  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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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Assertion : Ammonical silver nitrate converts glucose to gluconic acid and metallic silver is precipitated.

Reason : Glucose acts as a weak reducing agent.

  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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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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

Concept Questions :-

Chemistry of KMnO4, K2Cr2O7 & CrO5 and others
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Which one of the following statements is not correct

(A) Nickel forms Ni(CO)4

(B) All the transition metals form mono metallic carbonyls

(C) Carbonyl are formed by transition metals

(D) Transition metals form complexes

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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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)

(A) 1.60 Ao

(B) 1.40 Ao

(C)1.96 Ao

(D)0.85 Ao

Concept Questions :-

Lanthanoid /actinoids Contraction
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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

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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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

 

Concept Questions :-

d-Block Elements,Physical and Chemical properties.
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