The d- and f- Block Elements Test

Question 1
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Chrome yellow is chemically known as

A
lead chromate

B
lead sulphate

C
lead iodide

D
basic lead acetate

Question 2
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A blood red colour is obtained when ferric chloride solution reacts eith:

A
$$KCN$$

B
$$KSCN$$

C
q$$K_4[Fe(CN)_6]$$

D
$$K_3[Fe(CN)_6]$$

Question 3
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In the dichromate anion $$(Cr_{2}O_{7}^{2-}),$$

A
all $$Cr - O$$ bonds are equivalent

B
$$6 \,Cr - O$$ bonds are equivalent

C
$$3 \,Cr - O$$ bonds are equivalent

D
no bonds in $$Cr_{2}O_{7}^{2-}$$ are equivalent.

Question 4
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Which of the following statements is wrong?

A
$$Ti^{4+}$$ and $$Ag^{+}$$ are repelled by magnetic field

B
$$Mn^{2+}$$ shows maximum magnetic character among the first transition series.

C
$$Fe^{2+}$$ is more stable than $$Mn^{2+}$$ towards oxidation to $$+3$$ state.

D
$$Cr$$ in $$Cr_{2}O_{7}^{2-}$$ ion involves $$sp^{3}d^{2}$$ hybridisation

Question 5
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$$CuSO_{4}$$ is paramagnetic while $$ZnSO_{4}$$ is diamagnetic because

A
$$Cu^{2+}$$ ion has $$3d^{9}$$ configuration while $$Zn^{2+}$$ ion has $$3d^{10}$$ configuration

B
$$Cu^{2+}$$ ion has $$3d^{5}$$ configuration while $$Zn^{2+}$$ ion has $$3d^{6}$$ configuration

C
$$Cu^{2+}$$ has half filled orbitals while $$Zn^{2+}$$ has fully filled orbitals

D
$$CuSO_{4}$$ is blue in colour while $$ZnSO_{4}$$ is white.

Question 6
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Which of the following complex ion has a magnetic moment same as $$[Cr(H_2O)_6]^{3+}$$?

A
$$[Mn(H_2O)_6]^{4+}$$

B
$$[Mn(H_2O)_6]^{3+}$$

C
$$[Fe(H_2O)_6]^{3+}$$

D
$$[Cu(H_3H)_4]^{2+}$$

Question 7
1 / -0

These questions consists of two statements each, printed as assertion and reason, while answering these questions you are required to choose any one of the following responses.

Assertion : $$CrO_3$$ reacts with $$HCl$$ to form thornyl chloride gas.
Reason : Chromyl chloride $$(CrO_2Cl_2)$$ has tetrahedral shape.

A
If both assertion and reason are true and the reason is a correct explanation of assertion

B
If both assertion and reason are true but reason is not a correct explanation of assertion

C
If assertion is true but the reason is false

D
If assertion is false but the reason is true

Question 8
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Transition metal and their compounds are used as catalysts in industry and in biological system. For example, in the contact process, vanadium compounds in the $$+5$$ state $$(V_2O_5$$ or $$VO_3^$$) are used to oxidise $$SO_2$$ to $$SO_3$$:
$$SO_2 + \frac{1}{2}O_2 \overset{V_2O_5}{\rightarrow}SO_3$$
It is thought that the actual oxidation process takes place in two stages. In the first step, $$V^{5+}$$ in the presence of oxide ions converts $$SO_2$$ to $$SO_3$$. At the same time, $$V^{5+}$$ is reduced to $$V^{4+}$$. $$2V^{5+}+O^{2-} + SO_2 2V^{4+}+ SO_3$$. In the second step, $$V^{5+}$$ is regenerated from $$V^{4+}$$ by oxygen :
$$2V^{4+}+\frac{1}{2}O_2 \rightarrow 2V^{5+} + O^{2-}.$$
The overall process is, of course, the sum of these two steps:
$$SO_2 + \frac{1}{2}O_2 \rightarrow SO_3$$

During the course of the reaction

A
catalyst undergoes changes in oxidation state

B
catalyst increases the rate constant

C
catalyst is regenerated in its original form when the reactants form the products

D
all are correct

Question 9
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Amongst $$Tif_{6}^{2-}, CoF_{6}^{3-}, Cu_2Cl_2 and NiCl_{4}^{2-}$$ the colourless species are:

A
$$CoF_{6}^{3-}$$ and $$NiCl_{4}^{2-}$$

B
$$TiF_{6}^{2-}$$ and $$CoF_{6}^{3-}$$

C
$$Cu_2Cl_2$$ and $$NiCl_{4}^{2-}$$

D
$$TiF_{6}^{2-}$$ and $$Cu_2Cl_2$$

Question 10
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A larger number of oxidation states are exhibited by the actinides than those by the lanthanides. The main reason being:

A
more reactive nature of the actinides than the lanthanides

B
$$4f$$ orbitals are more diffused than the $$5f$$ orbitals

C
lesser energy difference between $$5f$$ and $$6d$$ orbitals than between $$4f$$ and $$5d$$ orbitals

D
more energy difference between $$5f$$ and $$6d$$ orbitals than between $$4f$$ and $$5d$$ orbitals

Submit Test

The d- and f- B...

Question 1

lead chromate

lead sulphate

lead iodide

basic lead acetate

Question 2

$$KCN$$

$$KSCN$$

q$$K_4[Fe(CN)_6]$$

$$K_3[Fe(CN)_6]$$

Question 3

all $$Cr - O$$ bonds are equivalent

$$6 \,Cr - O$$ bonds are equivalent

$$3 \,Cr - O$$ bonds are equivalent

no bonds in $$Cr_{2}O_{7}^{2-}$$ are equivalent.

Question 4

$$Ti^{4+}$$ and $$Ag^{+}$$ are repelled by magnetic field

$$Mn^{2+}$$ shows maximum magnetic character among the first transition series.

$$Fe^{2+}$$ is more stable than $$Mn^{2+}$$ towards oxidation to $$+3$$ state.

$$Cr$$ in $$Cr_{2}O_{7}^{2-}$$ ion involves $$sp^{3}d^{2}$$ hybridisation

Question 5

$$Cu^{2+}$$ ion has $$3d^{9}$$ configuration while $$Zn^{2+}$$ ion has $$3d^{10}$$ configuration

$$Cu^{2+}$$ ion has $$3d^{5}$$ configuration while $$Zn^{2+}$$ ion has $$3d^{6}$$ configuration

$$Cu^{2+}$$ has half filled orbitals while $$Zn^{2+}$$ has fully filled orbitals

$$CuSO_{4}$$ is blue in colour while $$ZnSO_{4}$$ is white.

Question 6

$$[Mn(H_2O)_6]^{4+}$$

$$[Mn(H_2O)_6]^{3+}$$

$$[Fe(H_2O)_6]^{3+}$$

$$[Cu(H_3H)_4]^{2+}$$

Question 7

If both assertion and reason are true and the reason is a correct explanation of assertion

If both assertion and reason are true but reason is not a correct explanation of assertion

If assertion is true but the reason is false

If assertion is false but the reason is true

Question 8

catalyst undergoes changes in oxidation state

catalyst increases the rate constant

catalyst is regenerated in its original form when the reactants form the products

all are correct

Question 9

$$CoF_{6}^{3-}$$ and $$NiCl_{4}^{2-}$$

$$TiF_{6}^{2-}$$ and $$CoF_{6}^{3-}$$

$$Cu_2Cl_2$$ and $$NiCl_{4}^{2-}$$

$$TiF_{6}^{2-}$$ and $$Cu_2Cl_2$$

Question 10

more reactive nature of the actinides than the lanthanides

$$4f$$ orbitals are more diffused than the $$5f$$ orbitals

lesser energy difference between $$5f$$ and $$6d$$ orbitals than between $$4f$$ and $$5d$$ orbitals

more energy difference between $$5f$$ and $$6d$$ orbitals than between $$4f$$ and $$5d$$ orbitals

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