The s-Block Elements Test 31

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The s-Block Elements Test 31

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Weekly Quiz Competition

Question 1
1 / -0

Rare-earth elements are exhibited by

A
At. no. 58 to 71

B
At. no.21 to 30

C
At. no. 39 to 71

D
At. no. 81 to 91

Solution

Atomic number 58 to 71 are rare earth metals and is called Lanthanoid series.
Question 2
1 / -0

With the increase in atomic weights, melting points of the alkali metals

A
Increase

B
Decrease

C
Remain constant

D
Do not show definite trend

Solution

With increase in atomic mass, melting points of alkali metals decreases due to increase in kernel size and decrease in strength of metallic bond.
Question 3
1 / -0

Which of the following elements would lose an electron easily?

A
Mg

B
Na

C
K

D
Ca

Solution

Na and K belong to the same group. i.e. Group I. Ca and Mg belong to the Group II. As we go down in a group, it is easier to remove the electron from the outermost shell. K has one electron in outermost shell and has lowest ionisation energy so it can lose electron most easily.
Question 4
1 / -0

In the following ions:
$$Mn^{3+}$$, $$V^{3+}$$, $$Cr^{3+}$$, $$Ti^{3+}$$
(Atomic no. : $$Mn = 25$$, $$V = 23$$, $$Cr = 24$$, $$Ti = 22$$)
Which ion has the highest number of unpaired electrons?

A
$$Mn^{3+}$$

B
$$V^{3+}$$

C
$$Cr^{3+}$$

D
$$Ti^{3+}$$

Solution

$$Mn^{3+} (3d^{4}4s^{0})$$. It has $$4$$ unpaired electrons.
Question 5
1 / -0

Which of the following is the outermost shell for elements of period 2?

A
K shell

B
L shell

C
M shell

D
N shell

Solution

In period 2, there are 2 shells, i.e. K and L.
Question 6
1 / -0

The alkali metals are low melting. Which of the following alkali metals is expected to melt if the room temperature rises to $$30^o$$?

A
Na

B
K

C
Rb

D
Cs

Solution

The melting point decreases down the group because the size increases and the forces in metallic bonding decreases. Melting point Cs = 302K.
Question 7
1 / -0

Which of the following metal has lowest melting point?

A
$$ Na $$

B
$$ K $$

C
$$ Rb $$

D
$$Cs $$

Solution

Cesium has lowest melting point.
Question 8
1 / -0

$$Ca^{2+} $$ is isoelectronic with

A
$$Na$$

B
$$Mg^{2+} $$

C
$$Ba^{2+} $$

D
$$Ar$$

Solution

Answer is option (D)$$Ar$$
Atomic no. of $$ Ca = 20 $$
$$ Ca^{2+} = 1s^2 2s^2 2p^6 3s^2 3p^6 , Ar = 1s^2 2s^2 2p^6 3s^2 3p^6 $$
Question 9
1 / -0

The properties of lithium are similar to those of Mg.
This is because

A
both have nearly the same size

B
the ratio of their charge to size is nearly the same

C
both have similar electronic configurations

D
both are found together in nature.

Solution

Answer is option (B)
$$Lithium$$ shows diagonal relationship with $$magnesium$$ since they have almost the same polarizing power i.e., charge/size ratio.
Question 10
1 / -0

Magnesium cation has polarising power close to that of:

A
$$Li^{+} $$

B
$$Na^{+} $$

C
$$K^{+} $$

D
$$Cs^{+} $$

Solution

lithium
$$Li^+$$

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Re-Attempt Weekly Quiz Competition

The s-Block Elements Test 31

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The s-Block Elements Test 31

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Question 1

At. no. 58 to 71

At. no.21 to 30

At. no. 39 to 71

At. no. 81 to 91

Solution

Question 2

Increase

Decrease

Remain constant

Do not show definite trend

Solution

Question 3

Mg

Na

K

Ca

Solution

Question 4

$$Mn^{3+}$$

$$V^{3+}$$

$$Cr^{3+}$$

$$Ti^{3+}$$

Solution

Question 5

K shell

L shell

M shell

N shell

Solution

Question 6

Na

K

Rb

Cs

Solution

Question 7

$$ Na $$

$$ K $$

$$ Rb $$

$$Cs $$

Solution

Question 8

$$Na$$

$$Mg^{2+} $$

$$Ba^{2+} $$

$$Ar$$

Solution

Question 9

both have nearly the same size

the ratio of their charge to size is nearly the same

both have similar electronic configurations

both are found together in nature.

Solution

Question 10

$$Li^{+} $$

$$Na^{+} $$

$$K^{+} $$

$$Cs^{+} $$

Solution

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