Classification of Elements and Periodicity in Properties Test

Result

Classification of Elements and Periodicity in Properties Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

The correct order of increasing electron affinity of the following elements is

A
$$O>C>N>B$$

B
$$B>N>C>O$$

C
$$O>C>B>N$$

D
$$O>B>C>N$$
Question 2
1 / -0

The elements with the lowest number that has a ground state electronic configuration of $$\left( {n - 1} \right){d^6}n{s^2}$$ is located in the :

A
fifth period

B
sixth period

C
fourth period

D
third period

Solution

For d, minimum orbital is $$3d$$ , which is in the fourth period {Option C}
Question 3
1 / -0

The first ionization potential of $$Na$$ is $$5.1\ eV$$. The value of electron gain enthalpy of $${ Na }^{ + }$$ will be:

A
$$-2.55\ eV$$

B
$$-5.1\ eV$$

C
$$-10.2\ eV$$

D
$$+2.55\ eV$$

Solution
Question 4
1 / -0

If each orbital can hold a maximum of three electrons, the number of elements in $$9 ^ { \text { th } }$$ period of periodic table (long form) are

A
$$48$$

B
$$162$$

C
$$50$$

D
$$75$$

Solution
Question 5
1 / -0

Which of following has highest EA?

A
$$F^{-}$$

B
$$Cl^{-}$$

C
$$Li^{+}$$

D
$$Na^{+}$$
Question 6
1 / -0

The inductive effects of the group $$ -\mathrm{CH}_{3},-\mathrm{COO}^{-},-\mathrm{Br},-\mathrm{NH}_{3}^{+} $$ respectively are:

A
$$
+I,-I,+I,+I
$$

B
$$
-I,+I,-I,+I
$$

C
$$
-I,-I,+I,+I
$$

D
$$
+I,+I,-I,-I
$$

Solution
Question 7
1 / -0

The amount of energy released from for the process $$ X_{(g)} + e^- \rightarrow X^-_{(g)} $$ is minimum respectively for:-

A
$$F$$

B
$$Cl$$

C
$$N$$

D
$$B$$
Question 8
1 / -0

For the highlighted element in its $$X^{2-}$$ form identify the CORRECT electronic configuration.

A
$$[Kr] 5s^2 4d^{10} 5p^4$$

B
$$[Kr] 5s^2 5p^4$$

C
$$[Kr] 5s^2 4d^{10} 5p^6$$

D
$$[Kr] 5s^2 5p^6$$
Question 9
1 / -0

The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitude (without sign) of their electron affinity:
(i) $$2s^2 \ 2p^5$$
(ii) $$3s^2 \ 3p^5$$
(iii) $$2s^2 \ 2p^4$$
(iv) $$3s^2 3p^4$$
Select the correct answer using the codes given below:

A
$$(i) < (ii) < (iii) < (iv) $$

B
$$(ii) > (i) > (iv) > (iii) $$

C
$$(i) < (iii) < (iv) < (ii)$$

D
$$(iii) < (iv) < (ii) < (I) $$

Solution
Question 10
1 / -0

General electronic configuration of outermost and penultimate shell is $$(n-1) s^2(n - 1)p^6(n - 1)d^x ns^2$$. If $$n = 4$$ and $$x = 5$$, then the number of protons in the nucleus will be:

A
$$> 25$$

B
$$< 24$$

C
$$25$$

D
$$30$$

Solution