Which of the following oxide is basic in nature?
1. SiO2
2. CaO
3. Al2O3
4. SO2

Subtopic:  Nature of Compound |
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A metalloid among the following is:

1.  Sc
2.  Pb
3.  Bi
4.  Te
Subtopic:  Modern Periodic Table & Periodicity |
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Which of the following is a metalloid?

1.  ln (Indium)
2.  Te (Tellurium)
3.  Pb (Lead)
4.  Bi (Bismuth)
Subtopic:  Modern Periodic Table & Periodicity |
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The correct electronic configuration of an element that is just above the 4th period and belongs to the 16th group:


1.  4s23d104p4

2.  2s22p4

3.  3s23p4

4.  5s25d104p4
Subtopic:  Electronic Configuration |
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The number of oxides among the following that exhibit an amphoteric nature is:

(a) \(Na_2O\)
(b) \(As_2O_3\)
(c) \(NO\)
(d) \(N_2O\)
(e) \(Cl_2O_7\)

1. 0
2. 1
3. 2
4. 3
 
Subtopic:  Nature of Compound |
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Mark the correct increasing order of the metallic character of the given below elements:
Si, K, Mg, and Be 
1. Si < Mg < Be < K 2. Be < Mg < Si < K
3. Si < Be < Mg < K 4. K < Mg < Si < Be
Subtopic:  Modern Periodic Table & Periodicity |
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Match the atomic numbers in List I with the corresponding groups in List II:

List-I (Atomic number) List-II (Group)
i. 52 P. s
ii. 37 Q. p
iii. 65 R. f
iv. 74 S. d
Choose the correct answer from the options given below:

1. (i)-Q, (ii)-P, (iii)-R, (iv)-S
2. (i)-Q, (ii)-P, (iii)-S, (iv)-R
3. (i)-S, (ii)-R, (iii)-P, (iv)-Q
4. (i)-R, (ii)-P, (iii)-Q, (iv)-S
Subtopic:  Electronic Configuration |
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Select the correct order of magnitudes of the first electron gain enthalpy from the options provided:
1. Cl < F
2. O < S
3. Te < O
4. S < Se
Subtopic:  Electron Affinity (EA) |
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Choose the option containing all isoelectronic species:

1. \(N^{3-}, O^{2-}, F, Na \)
2. \(\mathrm{S}^{-2}, \mathrm{Cl}^{-}, \mathrm{K}^{+}, \mathrm{Ca}^{2+} \)
3. \(\mathrm{NH}_3, \mathrm{CH}_4, \mathrm{PF}_5, \mathrm{Na}^{+} \)
4. \(\mathrm{Ne}, \mathrm{Na}^{+}, \mathrm{F}, \mathrm{N}^{3-} \)
Subtopic:  Modern Periodic Table & Periodicity |
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According to the periodic law of elements, the variation in properties of elements is related to their: 

1. Atomic masses 

2. Nuclear mass 

3. Atomic numbers 

4. Nuclear neutron-proton number ratio

Subtopic:  Modern Periodic Table & Periodicity |
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