In the cyanide ion, the formal negative charge is on
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
Memory
Which of the following elements will have the lowest first ionisation energy?
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
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 […]
Pauling’s electro negativity values for elements are useful in predicting
Pauling’s electro negativity values for elements are useful in predicting
Options
(a) Polarity of the molecules (b) Position in the E.M.F. series (c) Coordination numbers (d) Dipole moments
Correct Answer:
Polarity of the […]
What is the packet of energy called?
What is the packet of energy called?
Options
(a) Electron (b) Photon (c) Positron (d) Proton
Correct Answer:
photon
Explanation:
According to Planck’s quantum theory of radiation, radient energy is emitted or absorbed […]
The shape of IF₇ molecule is
The shape of IF₇ molecule is
Options
(a) octahedral (b) trigonal bipyramidal (c) tetrahedral (d) pentagonal bipyramidal
Correct Answer:
pentagonal bipyramidal
Explanation:
Number of hybrid orbitals, H = 1/2 [V + M + […]
Which of the following species contains three bond pairs and one lone pair
Which of the following species contains three bond pairs and one lone pair around the central atom?
Options
(a) H₂O (b) BF₃ (c) NH₂⁻ (d) PCl₃
Correct Answer:
PCl₃
Explanation:
PCl₃ is central […]
In a given atom no two electrons can have the same values for all
In a given atom no two electrons can have the same values for all the four quantum numbers.This is called
Options
(a) Hund’s Rule (b) Aufbau principle (c) Uncertainty principle (d) Pauli’s Exclusion […]
The number of spherical nodes in 3p orbitals are
The number of spherical nodes in 3p orbitals are
Options
(a) one (b) three (c) none (d) two
Correct Answer:
one
Explanation:
No. of radial nodes in 3p-orbital= (n – l – 1) […]
The pair of species with the same bond order is:
The pair of species with the same bond order is:
Options
(a) O₂²⁻, B₂ (b) O₂⁺, NO⁺ (c) NO, CO (d) N₂, O₂
Correct Answer:
O₂²⁻, B₂
Explanation:
No explanation available. Be the […]