158) If KMnO₄ is reduced by oxalic acid in an acidic medium, then oxidation number of Mn changes from:

Answer is:

7 to 2

Inorganic Chemistry MCQ with Answers

159) In context with the transition elements, which of the following statements is incorrect?

In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes

In the highest oxidation states, the transition metals show basic character and form cationic complexes

In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding

Once the d⁵ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases

Answer is:

In the highest oxidation states, the transition metals show basic character and form cationic complexes

Explanation:

When the transition metals are in their highest oxidation state, they no longer have tendency to give away electrons, thus they are not basic, but show acidic character and form anionic complexes.

160) A compound of a metal ion M^x+ (Z = 24) has a spin only magnetic moment of 2.82 BM. The number of unpaired electrons in the compound are:

Answer is:

2

161) The colourless species is:

Answer is:

Na₃VO₅

Explanation:

It is colourless due to the absence of d−d transition.

162) The main reason for large number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:

Answer is:

Lesser energy difference between 5f and 6d orbitals than in between 4f and 5d orbitals

Inorganic Chemistry MCQ with Answers

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158) If KMnO4 is reduced by oxalic acid in an acidic medium, then oxidation number of Mn changes from:

7 to 2

Inorganic Chemistry MCQ with Answers

Related Inorganic Chemistry MCQ with Answers

159) In context with the transition elements, which of the following statements is incorrect?

In the highest oxidation states, the transition metals show basic character and form cationic complexes

160) A compound of a metal ion Mx+ (Z = 24) has a spin only magnetic moment of 2.82 BM. The number of unpaired electrons in the compound are:

2

161) The colourless species is:

Na3VO5

162) The main reason for large number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:

Lesser energy difference between 5f and 6d orbitals than in between 4f and 5d orbitals

Inorganic Chemistry MCQ with Answers

158) If KMnO₄ is reduced by oxalic acid in an acidic medium, then oxidation number of Mn changes from:

160) A compound of a metal ion M^x+ (Z = 24) has a spin only magnetic moment of 2.82 BM. The number of unpaired electrons in the compound are:

Na₃VO₅