The smallest among the following ion is
The smallest among the following ion is
Options
(a) Na⁺ (b) Mg²⁺ (c) Ba²⁺ (d) Al³⁺
Correct Answer:
Al³⁺
Explanation:
The size of an species decreases with increasing nuclear charge became the attraction […]
Memory
The stability of +1 oxidation state increases in the sequence:
The stability of +1 oxidation state increases in the sequence:
Options
(a) Tl < In < Ga < Al (b) In < Tl < Ga < Al (c) Ga < In < Al […]
Be resembles much with
Be resembles much with
Options
(a) Li (b) Al (c) Zn (d) Ra
Correct Answer:
Al
Explanation:
Be resembles much with Al, due to diagonal relationship.
When a neutral atom is converted into a cation, there is
When a neutral atom is converted into a cation, there is
Options
(a) decrease in the atomic number (b) an increase in the atomic number (c) an increase in size (d) a decrease […]
What is the weight of oxygen required for the complete combusion of 2.8 kg of ethylene?
What is the weight of oxygen required for the complete combusion of 2.8 kg of ethylene?
Options
(a) 2.8 kg (b) 6.4 kg (c) 9.6 kg (d) 96 kg
Correct Answer:
9.6 kg
The first ionization potentials (eV) of Be and B respectively are
The first ionization potentials (eV) of Be and B respectively are
Options
(a) 8.29, 9.32 (b) 9.32, 9.32 (c) 8.29, 8.29 (d) 9.32, 8.29
Correct Answer:
9.32, 8.29
Explanation:
First ionisation potential of […]
Which has the maximum number of molecules among the following
Which has the maximum number of molecules among the following
Options
(a) 44 g CO₂ (b) 48 g O₃ (c) 8 g H₂ (d) 64 g SO₂
Correct Answer:
8 g H₂
Explanation: […]
A sample of CaCO₃ is 50% pure. On heating 1.12 L of CO₂ at STP is obtained
A sample of CaCO₃ is 50% pure. On heating 1.12 L of CO₂ at STP is obtained. Residue left(assuming non volatile impurity) is
Options
(a) 7.8 g (b) 3.8 g (c) 2.8 g […]
A mixture contains O₂ and N₂ in the ratio of 1 : 4 by the weight
A mixture contains O₂ and N₂ in the ratio of 1 : 4 by the weight. The ratio of their number of moles is
Options
(a) 1 : 8 (b) 1 : 4 […]
If the energy of a photon is given as : =3.03 × 10⁻¹⁹J then, the wavelength (λ)
If the energy of a photon is given as : =3.03 × 10⁻¹⁹J then, the wavelength (λ) of the photon is :
Options
(a) 6.56 nm (b) 65.6 nm (c) 656 nm (d) […]