The screening effect of d-electrons is
Options
(a) equal to that of p-electrons (b) more than that of p-electrons (c) same as f-electrons (d) less than p-electrons
Correct Answer:
same as f-electrons
Explanation: […]
Electric configuration of chalcogens in their outermost orbit is
Options
(a) s²p³ (b) s²p⁴ (c) s²p⁵ (d) s²p⁶
Correct Answer:
s²p⁴
Explanation:
Chalcogens are oxygen family.
There is no S – S bond in
Options
(a) S₂O₄²⁻ (b) S₂O₅²⁻ (c) S₂O₃²⁻ (d) S₂O₇²⁻
Correct Answer:
S₂O₇²⁻
Explanation:
No explanation available. Be the first to write the explanation for this […]
The correct order of the decreasing ionic radii among the following isoelectronic species are :
Options
(a) Ca²⁺ > K⁺ > S²⁻ > Cl⁻ (b) Cl⁻ > S²⁻ >Ca²⁺ > K⁺ (c) S²⁻ […]
The solubility of anhydrous AlCl₃ and hydrous AlCl₃ in diethylether are S₁ and S₂ repectively. Then
Options
(a) S₁ = S₂ (b) S₁ > S₂ (c) S₁ < S₂ (d) None of these
If electron has spin quantum number +1/2 and magnetic quantum number -1, it cannot be present in
Options
(a) d-orbital (b) f-orbital (c) p-orbital (d) s-orbital
Correct Answer:
s-orbital
Explanation:
No explanation available. […]
If r is the radius of the first orbit, the radius of nth-orbit of H-atom is given by
Options
(a) rn² (b) rn (c) r/n (d) r² n²
Correct Answer:
rn²
Explanation:
Radius […]
In the cyanide ion, the formal negative charge is on
Options
(a) C (b) N (c) Both C and N (d) resonate between C and N
Correct Answer:
resonate between C and N
Which of the following elements will have the lowest first ionisation energy?
Options
(a) Li (b) Mg (c) Ca (d) Rb
Correct Answer:
Rb
Explanation:
Rb belongs to I-A group and has maximum […]
When the first ionisation energies are plotted against atomic number, the peaks are occupied
Options
(a) alkali metals (b) halogens (c) transition metals (d) rare gases
Correct Answer:
rare gases
Explanation:
Rare gases […]
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