Which of the following has highest hydration energy
Options
(a) MgCl₂ (b) CaCl₂ (c) BaCl₂ (d) SrCl₂
Correct Answer:
MgCl₂
Explanation:
No explanation available. Be the first to write the explanation for this […]
The maximum valency of an element with atomic number 7 is
Options
(a) 2 (b) 5 (c) 4 (d) 3
Correct Answer:
5
Explanation:
No explanation available. Be the first to write the […]
The metal having the highest melting point is
Options
(a) chromium (b) diamond (c) tungsten (d) silver
Correct Answer:
tungsten
Explanation:
Tungsten (W) metal has hgihest melting point.
Variable valency in general, is exhibited by
Options
(a) transition elements (b) gaseous elements (c) non-metals (d) s-block elements
Correct Answer:
transition elements
Explanation:
Transition elements show variable valency due to presence of […]
Which of the following oxides is amphoteric in character?
Options
(a) Co₂ (b) CaO (c) SiO₂ (d) SnO₂
Correct Answer:
SnO₂
Explanation:
CaO — basic Co₂ — acidic SiO₂ — weakly acidic SnO₂ […]
In the periodic table, the element with atomic number 16 will be placed in the group
Options
(a) third (b) fourth (c) fifth (d) sixth
Correct Answer:
sixth
Explanation:
₁₆X ≡ 1s²2s²2p⁶3s²3s⁴; there […]
The electronegativity of the following elements increases in the order
Options
(a) C, N, Si ,P (b) N, Si, C, P (c) Si, P, C, N (d) P, Si, N, C
Correct Answer: […]
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.
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⁻ […]
2017 Copyright Doctor Dreams Training Academy