Which one of the elements has the highest ionisation energy?
Options
(a) [Ne] 3s²3p¹ (b) [Ne] 3s²,3p² (c) [Ne] 3s²,3p³ (d) [Ar] 3d¹°4s²4p²
Correct Answer:
[Ne] 3s²,3p³
Explanation:
Exactly half-filled orbitals have extra […]
Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?
Options
(a) [BCl₃ and BrCl₃⁻] (b) [NH₃ and NO₃⁻] (c) [NF₃ and BF₃] (d) [BF₄⁻ and NH₄⁻]
Correct […]
Which of the following is electron-deficient?
Options
(a) (SiH₃)₂ (b) (BH₃)₂ (c) PH₃ (d) (CH₃)₂
Correct Answer:
(BH₃)₂
Explanation:
Electron deficient molecules are compounds which do not have sufficient number of eletrons to […]
What is the value of electron gain enthalpy of Na+ if IE₁ of Na =5.1 eV ?
Options
(a) –5.1 eV (b) –10.2 eV (c) +2.55 eV (d) +10.2 eV
Correct Answer:
–5.1 […]
The energy of an electron in the nth Bohr orbit of hydrogen atom is
Options
(a) –(13.6/n⁴)eV (b) –(13.6/n³)eV (c) –(13.6/n²)eV (d) –(13.6/n)eV
Correct Answer:
–(13.6/n²)eV
Explanation:
No explanation available. Be the first […]
The energy of second Bhor orbit of the hydrogen atom is -328 kJ mol⁻¹, hence the enregy of fourth Bohr orbit would be
Options
(a) -41 kJ mol⁻¹ (b) -1312 kJ mol⁻¹ (c) […]
The number of moles of KMnO₄ that will be needed to react with one mole of sulphite ion in acidic solution is
Options
(a) 4/5 (b) 2/5 (c) 1 (d) 3/5
Correct Answer:
2/5
The equivalent weight of phosphoric acid(H₃PO₄) in the reaction, NaOH + H₃PO₄ → NaH₂PO₄ + H₂O is
Options
(a) 59 (b) 49 (c) 25 (d) 98
Correct Answer:
98
Explanation:
NaOH + H₃PO₄ […]
What is the equivalent weight of SnCl₂ in the following reaction, SnCl₂+Cl₂→ SnCl₄?
Options
(a) 95 (b) 45 (c) 60 (d) 30
Correct Answer:
95
Explanation:
Equivalent weight of SnCl₂= mol. wt./2 = […]
0.037g of an alcohol, R-OH was added to C₂H₅Mgl and the has evolved measured 11.2cc at STP. The molecular mass of R-OH will be
Options
(a) 47 (b) 79 (c) 77 (d) 74
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