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12th Standard English Medium Chemistry Subject Transition and Inner Transition Elements Book Back 1 Mark Questions with Solution Part - II

Published on: 01/06/2021

QB365 provides detailed and simple solution for every Book back Questions in class 12 Chemistry Subject. It will helps to get more idea about question pattern in every book back questions with solution.

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Chemistry

chapter: - Book back Questions

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Questions:

Multiple Choice Question

5 x 1 = 5

Which of the following oxidation states is most common among the lanthanoids?

(a)

(b)

(c)

(d)

Which of the following lanthanoid ions is diamagnetic?

(a)

Eu²⁺

(b)

Yb²⁺

(c)

Ce²⁺

(d)

Sm²⁺

Which one of the following statements related to lanthanons is incorrect?

(a)

Europium shows +2 oxidation state

(b)

The basicity decreases as the ionic radius decreases from Pr to Lu.

(c)

All the lanthanons are much more reactive than aluminium

(d)

Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis.

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH₃ to give an explosive compound (C). The compound A, B and C are ________.

(a)

MnO₂, Cl₂, NCl₃

(b)

MnO, Cl₂, NH₄Cl

(c)

Mn₃O₄, Cl₂, NCl₃

(d)

MnO₃, Cl₂, NCl₂

The number of moles of acidified KMnO₄required to oxidize 1 mole of ferrous oxalate(FeC₂O₄) is _______.

(a)

(b)

(c)

0.6

(d)

1.5

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(d)
+3

Yb²⁺ - 4f¹⁴ - no unpaired electrons - diamagnetic

As we move from La to Lu, their metallic behaviour because almost similar to that of aluminium.

(a)
MnO₂, Cl₂, NCl₃

+7 +2+3 2+ 3+ 4+
MnO₄^- + FeC₂O₄ ⟶ Mn²⁺ + Fe³⁺ + 2CO₂
5e^-acception 3e^- release
5 moles of FeC₂O₄ \(\equiv\) 3 moles of KMnO₄
1 mole of FeC₂O₄ \(\equiv\) (3/5) moles of KMnO₄
1 mole of FeC₂O₄ \(\equiv\) 0.6 moles of KMnO₄