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32 Year NEET Previous Year Questions: The d & f-Block Elements - 1


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35 Questions MCQ Test Chemistry Class 12 | 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 for NEET 2022 is part of Chemistry Class 12 preparation. The 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 questions and answers have been prepared according to the NEET exam syllabus.The 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 below.
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32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 1

Which of the following metals corrodes readily in moist air ? [1980]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 1

In moist air, corrosion of iron takes place in the form of rust (Fe2O3 + Fe(OH)3) . As iron is most reactive among all.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 2

Which one of the following is an ore of silver ? [1983]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 2

Argentite or silver glance (Ag2S) is an ore of Ag.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 3

The oxidation state of Cr in K2Cr2O7 is[1988]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 3

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 4

Prussian blue is formed when [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 4

Potassium ferrocyanide solution is added to Fe3+ ions in solution to give deep blue solution or precipitate.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 5

Photographic films and plates have an essential ingredient of [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 5

AgBr is highly photosensitive and is used in photographic films and plates.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 6

Nitriding is the process of surface hardening of steel by treating it in an atmosphere of [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 6

When steel is heated in presence of NH3 , iron nitride on the surface of steel is formed which imparts a hard coating. This process is called nitriding.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 7

While extracting an element form its ore, the ore is ground and leached with dil. potassium cyanide solution to form the soluble product potassium argento cyanide. The element is [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 7

Cyanide process is used in the metallurgy of Ag

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 8

The electronic configurations of four elements are given below. Which element does not belong to the same family as others ? [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 8

[ Ne]3s23p 5 is the electronic configuration of a p-block element whereas other configuration are those of d-block elements

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 9

The composition of ‘golden spangles’ is [1990]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 9

PbI2 is yellow and is called golden spangles.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 10

A blue colouration is not obtained when [1989]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 10

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 11

The electronic configuration of Cu (atomic number 29) is [1991]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 11

Electronic configuration of Cu(29) is 1s2 2s2 2p6 3p2 3p6 4s1 3d10 and not 1s2, 2s2 2p6 3s2 3p6 4s2, 3d9 due to extra stability of fully filled orbitals.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 12

Cinnabar is an ore of [1991]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 12

Cinnabar (HgS) is an ore of Hg.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 13

The transition elements have a general electronic configuration [1991]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 13

General electronic configuration of transition elements is (n - 1)d1 -10ns1- 2

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 14

When CuSO4 is electrolysed using platinum electrodes, [1993]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 14

At cathode :  

At anode : 

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 15

The most durable metal plating on iron to protect against corrosion is [1994]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 15

Galvanisation is the process of deposition of zinc metal on the surface of Fe to prevent it from rusting etc. Zinc forms a protective layer of basic carbonate (ZnCO3. Zn(OH)2) on it.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 16

The common oxidation states of Ti are [1994]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 16

The minimum oxidation state in transition metal is equal to the number of electrons in 4s shell and the maximum oxidation state is equal to the sum of the 4s and 3d electrons.
Ti  3d2 4s2 hence minimum oxidation state is +2 and maximum oxidation state is +4. Thus the common oxidation states of Ti are +2, +3 & +4

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 17

When (NH4)2 Cr2O7 is heated, the gas evolved is[1994]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 17

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 18

Actinides [1994]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 18

Actinides have variable valency due to very small difference in energies of 5f, 6d and 7s orbitals. Actinides are the elements from atomic number 89 to 103.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 19

Among the lanthanides the one obtained by synthetic method is [1994]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 19

Pm is obtained by synthetic method.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 20

Stainless steel contains iron and [1995]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 20

Stainless steel contains 73% Fe, 18% Cr and 8% Ni.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 21

Cuprous compounds such as CuCl, CuCN and CuSCN are the only salts stable in water due to

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 21

The smaller is the size of cation, the more is heat of  hydration. Since hydration is exothermic process, thus heat evolves and hence system having lower energy are stable.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 22

K2Cr2O7 on heating with aqueous NaOH gives [1997]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 22

Hence ion is obtained.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 23

The lanthanide contraction is responsible for the fact that [1997]           (Atomic numbers : Zr = 40, Y = 39, Nb = 41, Hf = 72, Zn = 30)

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 23

We know that regular decrease in the size of the atoms and ions is called lanthanide contraction. In vertical column of transition elements there is a very small change in size and some times size is found same from second member to third member.The similarity in size of the atoms of Zr and Hf is evident due to the object of lanthanide contraction. Therefore Zr and Hf both have same radius 160 pm.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 24

CrO3 dissolves in aqueous NaOH to give [1997]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 24

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 25

The electroniccon figuration of gadolinium (Atomic number 64) is [1997]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 25

We know that atomic number of gadolinium is 64. Therefore the electronic configuration of gadolinium is [Xe] 4f7 5d1 6s2. Because the half filled and fully filled orbitals are more stable.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 26

Which one of the following elements constitutes a major impurity in pig iron ? [1998]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 26

Pig iron is the most impure form of iron and contains the highest proportion of carbon (2.5 – 4%).

Since graphite is a form of carbon, A is the correct answer.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 27

Which one of the following elements shows maximum number of different oxidation states in its compounds? [1998]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 27

We know that lanthanides Eu, La, Gd shows +2, +3, +3 and +3 oxidation states respectively only. while actinides, Am shows +2, +3, +4, +5 and +6 oxidation state. Therefore American (Am) has maximum number of oxidation state.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 28

Which one of the following ionic species will impart colour to an aqueous solution? [1998]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 28

We know that chromium (III) salts dissolve in water to give violet solution. The violet colour is due to the hydrated chromium (III) in 

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 29

On heating chromite (FeCr2O4) with Na2CO3 in air, which of the following product is obtained? [1999]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 29

By heating chromite with Na2 CO3, Na2CrO4 is obtained

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 30

The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 30

[Cu (NH3)4]2+ on addition of excess of aqneous HNO3 gives [Cu (H2O)4]2+

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 31

An acidic solution of 'X' does not give precipitate on passing H2S through it. 'X' gives white precipitate when NH4OH is added to it. The white precipitate dissolves in excess of NaOH solution.Pure 'X' fumes in air and dense white fumes are obtained when a glass rod dipped in NH4OH is put in the fumes. Compound 'X' can be [1999]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 31

Given reactions (white precipitate with H2S in presence of NH4OH) indicate that 'X' should be ZnCl2 which explains all given reactions

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 32

Of the following transition metals, the maximum numbers of oxidation states are exhibited by: [2000]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 32

Manganese shows max. no. of oxidation states, +2, +3, + 4, + 5, + 6, + 7
Other metals shows the following oxidation states
Cr = + 2, +3, + 4, + 5, + 6
Fe = + 2, + 3
Ti = + 2, + 3, + 4

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 33

Which of the following forms colourless compound? [2000]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 33

Scandium ion doesn’t contain any unpaired electron in d orbitals hence it form colourless compound.

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 34

German silver is an alloy of [2000]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 34

German Silver Composition : Cu = 56%, Zn = 24%, Ni = 20%

32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 35

Which of the following combines with Fe (II) ions to form a brown complex? [2000]

Detailed Solution for 32 Year NEET Previous Year Questions: The d & f-Block Elements - 1 - Question 35

We know that when nitrogen oxide (NO) combines with Fe (II) ions, a brown complex is formed. This reaction is called brown ring test

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