Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed
Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed. The concentration of NO₃⁻ ions in the mixture will be
Options
(a) 0.1 M (b) 0.05 M (c) 0.2 M (d) […]
Chemistry
6.02 x 10²° molecules of urea are present in 100 mL of its solution
6.02 x 10²° molecules of urea are present in 100 mL of its solution. The concentration of the solution is
Options
(a) 0.01 M (b) 0.001 M (c) 0.1 M (d) 0.02 M
In hydrogen atom, energy of first excited state is –3.4 eV. Find out KE
In hydrogen atom, energy of first excited state is –3.4 eV. Find out KE of the same orbit of Hydrogen atom
Options
(a) +3.4 eV (b) +6.8 eV (c) –13.6 eV (d) +13.6 […]
The electronic configuration of four elements are given below. Which elements does
The electronic configuration of four elements are given below. Which elements does not belong to the same family as others ?
Options
(a) [Xe]4f¹⁴5d¹°1s² (b) [Kr]4d¹°5s² (c) [Ne]3s³3p⁵ (d) [Ar] 3d¹°4s²
Correct Answer: […]
Which one of the elements has the highest ionisation energy?
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 – same shape and hybridization
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?
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 ?
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
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
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) […]