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 is never true for cathode rays?
Options
(a) They possess kinetic energy (b) They are electromagnetic waves (c) They produce heat (d) They produce mechanical pressure
Correct Answer:
They […]
The structure of XeOF₄ is
Options
(a) planar (b) tetrahedral (c) square pyramidal (d) pyramidal
Correct Answer:
square pyramidal
Explanation:
In XeOF₄, Xe is sp³d²-hybridised. Xe atom has one lone pair and 6 […]
The two electrons in K-subshell will differ in
Options
(a) principal quantum number (b) azimuthal quantum number (c) magnetic quantum number (d) spin quantum number
Correct Answer:
spin quantum number
Explanation:
The two […]
Carbon atom in C₂(CN)₄ are
Options
(a) sp-hybridised (b) sp²-hybridised (c) sp-and sp² – hybridised (d) sp-sp² and sp³ – hybridised
Correct Answer:
sp-and sp² – hybridised
Explanation:
No explanation available. Be the […]
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 photo-electron emission,the energy of the emitted electron is
Options
(a) greater than the incident photon (b) same as than of the incident photon (c) smaller than the incident photon (d) proportional […]
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: […]
In which one of the following molecules the central atom does not have sp³ hybridization?
Options
(a) NH₄⁺ (b) CH₄ (c) SF₄ (d) BF₄⁻
Correct Answer:
SF₄
Explanation:
NH₄⁺, CH₄, BF₄⁻ : sp³ […]
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