The d- and f- Block Elements Test

Result

The d- and f- Block Elements Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

Magnetic moment 2.84 B.M is given by:-

A
$$Ti^{3+}$$

B
$$Cr^{2+}$$

C
$$Co^{2+}$$

D
$$Ni^{2+}$$
Question 2
1 / -0

The thermal decomposition of ammonium dichromate produces a green residue of:

A
$$Cr_2O_3$$

B
$$CrO_2$$

C
$$CrO_3$$

D
$$CrO_5$$

Solution
Question 3
1 / -0

Colourless ion is:

A
$${ \left[ { Fe\left( CN \right) }_{ 6 } \right] }^{ -3 }$$

B
$${ \left[ { Ti\left( { H }_{ 2 }O \right) }_{ 6 } \right] }^{ +3 }$$

C
$${ \left[ { Sc\left( { H }_{ 2 }O \right) }_{ 6 } \right] }^{ +3 }$$

D
$${ \left[ { Cu\left( NH_{ 3 } \right) }_{ 4 } \right] }^{ +2 }$$
Question 4
1 / -0

Number of identical $$Cr-O$$ bonds in dichromate ion $${Cr_2{ O }_{ 7 }}^{ 2- }$$ is:

A
4

B
6

C
7

D
8
Question 5
1 / -0

Match the following catalyst with their products-
Sr Column 1 Sr Column 2
1. $$TiCl_4+AlCl_3$$ a. Ethanal
2. $$V_2O_5$$ b. $$NH_3$$
3. $$Fe$$ c. Polyethylene
4. $$Pd$$ d. $$H_2SO_4$$

A
$$(i)-B ; (ii)-A ; (iii)-D ; (iv)-C$$

B
$$(i)-C ; (ii)-D ; (iii)-B ; (iv)-A$$

C
$$(i)-D ; (ii)-A ; (iii)-B; (iv)-C$$

D
$$(i)-A ; (ii)-B ; (iii)-C ; (iv)-D$$

Solution

Solution:- (B) $$\left( i \right) - C; \; \left( ii \right) - D; \; \left( iii \right) - B; \; \left( iv \right) - A$$
$$\left( 1 \right) Ti{Cl}_{4} + Al{Cl}_{3} \rightarrow \text{Polyethylene} \left( c \right)$$
$$\left( 2 \right) {V}_{2}{O}_{5} \rightarrow {H}_{2}S{O}_{4} \left( d \right)$$
$$\left( 3 \right) Fe \rightarrow N{H}_{3} \left( b \right)$$
$$\left( 4 \right) Pd \rightarrow \text{Ethanal} \left( a \right)$$
Question 6
1 / -0

The number of unpaired electron(s) in $$ [Fe(H_2O)_6]^{2+} $$ is

A
1

B
2

C
3

D
4

Solution
Question 7
1 / -0

Fenton reagent is

A
$${ FeSO }_{ 4 }+{ H }_{ 2 }{ O }_{ 2 }$$

B
$$Zn + HCl$$

C
$$Sn + HCl$$

D
None of the above

Solution
Question 8
1 / -0

What is the value of spin only magnetic moment of anionic and cationic part of complex $${\left[ Fe{ \left( { H }_{ 2 }O \right) }_{ 6 } \right] }_{2}$$ $$\left[ Fe{ \left( CN \right) }_{ 6 } \right] $$?

A
$$4.9$$ B.M and Zero

B
Zero and $$4.9$$ B.M

C
$$2.9$$ B.M and $$0$$

D
$$0$$ and $$2.9$$ B.M

Solution

$${ \left[ Fe{ \left( CN \right) }_{ 6 } \right] }^{ -4 }$$
$${ Fe }^{ +2 }\longrightarrow 3{ d }^{ 6 }\quad $$
$${CN}^{-}\rightarrow$$ S.F.L
$${t}_{2g}^{2,2,2}$$ $${eg}^{0,0}$$
No. of unpaired $${e}^{-}=0$$
$$B.M=0$$
$${ \left[ Fe{ \left( { H }_{ 2 }O \right) }_{ 6 } \right] }^{ +2 }$$
$${ Fe }^{ +2 }\longrightarrow 3{ d }^{ 6 }\quad $$
$${H}_{2}O\rightarrow $$W.FL
$${t}_{2g}^{2,1,1}$$ $${eg}^{1,1}$$
No. of unpaired electrons $${e}^{-}=4$$
$$\quad \mu =\sqrt { 4\times 6 } =\sqrt { 24 } B.M=4.9B.M$$
Question 9
1 / -0

Copper sulphate disolves in excess of $$KCN$$ to give:

A
$$Cu\left( CN \right) _{ 2 }$$

B
$$CuCN$$

C
$$[Cu\left( CN \right) _{ 4 }]^{ 3- }$$

D
$$[Cu\left( CN \right) _{ 4 }]^{ 2- }$$
Question 10
1 / -0

Which of the following ions has maximum magnetic moment?

A
$$Mn^{2+}$$

B
$$Fe^{2+}$$

C
$$V ^ { 3 + }$$

D
$$Ti^{2+}$$

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Re-Attempt Weekly Quiz Competition

Sr	Column 1	Sr	Column 2
1.	$$TiCl_4+AlCl_3$$	a.	Ethanal
2.	$$V_2O_5$$	b.	$$NH_3$$
3.	$$Fe$$	c.	Polyethylene
4.	$$Pd$$	d.	$$H_2SO_4$$

The d- and f- Block Elements Test - 65

Result

The d- and f- Block Elements Test - 65

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Question 1

$$Ti^{3+}$$

$$Cr^{2+}$$

$$Co^{2+}$$

$$Ni^{2+}$$

Question 2

$$Cr_2O_3$$

$$CrO_2$$

$$CrO_3$$

$$CrO_5$$

Solution

Question 3

$${ \left[ { Fe\left( CN \right) }_{ 6 } \right] }^{ -3 }$$

$${ \left[ { Ti\left( { H }_{ 2 }O \right) }_{ 6 } \right] }^{ +3 }$$

$${ \left[ { Sc\left( { H }_{ 2 }O \right) }_{ 6 } \right] }^{ +3 }$$

$${ \left[ { Cu\left( NH_{ 3 } \right) }_{ 4 } \right] }^{ +2 }$$

Question 4

4

6

7

8

Question 5

$$(i)-B ; (ii)-A ; (iii)-D ; (iv)-C$$

$$(i)-C ; (ii)-D ; (iii)-B ; (iv)-A$$

$$(i)-D ; (ii)-A ; (iii)-B; (iv)-C$$

$$(i)-A ; (ii)-B ; (iii)-C ; (iv)-D$$

Solution

Question 6

1

2

3

4

Solution

Question 7

$${ FeSO }_{ 4 }+{ H }_{ 2 }{ O }_{ 2 }$$

$$Zn + HCl$$

$$Sn + HCl$$

None of the above

Solution

Question 8

$$4.9$$ B.M and Zero

Zero and $$4.9$$ B.M

$$2.9$$ B.M and $$0$$

$$0$$ and $$2.9$$ B.M

Solution

Question 9

$$Cu\left( CN \right) _{ 2 }$$

$$CuCN$$

$$[Cu\left( CN \right) _{ 4 }]^{ 3- }$$

$$[Cu\left( CN \right) _{ 4 }]^{ 2- }$$

Question 10

$$Mn^{2+}$$

$$Fe^{2+}$$

$$V ^ { 3 + }$$

$$Ti^{2+}$$

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