Planar structure is shown by
Planar structure is shown by
Options
(a) CO₃²⁻ (b) BCl₃ (c) N(SiH₃)₃ (d) All of these
Correct Answer:
All of these
Explanation:
C in CO₃²⁻ and B in BCl₃ are sp²-hybridised thus acquire […]
Questions
100 mL each of 0.5 N NaOH, N/5 HCl and N/10 H₂SO₄ are mixed together
100 mL each of 0.5 N NaOH, N/5 HCl and N/10 H₂SO₄ are mixed together. The resulting solution will be
Options
(a) acidic (b) neutral (c) alkaline (d) None of these
Correct Answer: […]
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 […]
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 […]