Reason of lanthanoid contraction is
Options
(a) negligible screening effect of ‘f’-orbitals (b) increasing nuclear charge (c) decreasing nuclear charge (d) decreasing screening effect
Correct Answer:
negligible screening effect of ‘f’-orbitals
Explanation:
No […]
Of the following 0.10 m aqueous solution which one will exhibit the largest freezing point depression
Options
(a) KCl (b) C₆H₁₂O₆ (c) Al₂(SO₄)₃ (d) K₂SO₄
Correct Answer:
Al₂(SO₄)₃
Explanation:
No explanation available. Be […]
Magnetic moment 2.83 BM is given by which of the following ions
Options
(a) Ti³⁺ (b) Ni²⁺ (c) Cr³⁺ (d) Mn²⁺
Correct Answer:
Ni²⁺
Explanation:
Magnetic moment µ=√n(n+2) 2.83=√n(n+2) On solving n=2 Ni²⁺ […]
In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the soil is […]
In the following reaction, the product(A)
Options
(a) (b) (c) (d)
Correct Answer: Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
In acidic medium, H₂O₂ changes Cr₂O₇²⁻ to CrO₅ which has two ( -O – O -) bonds. Oxidation state of Cr in CrO₅ is
Options
(a) 5 (b) 3 (c) 6 (d) -10
If a is the length of the side of a cube the distance between the body centered atom and one corner atom in the cube will be
Options
(a) 2/√3a (b) 4/√3a (c) […]
Identify Z in the sequence of reaction : HBr/H₂O₂ C₂H₅ONa CH₃CH₂CH = CH₂ → Y → Z
Options
(a) CH₃ – (CH₂)₃ – O – CH₂CH₃ (b) (CH₂)₃CH – O – CH₂CH₃ (c) […]
For the reversible reaction , N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + heat The equilibrium shifts in forward direction
Options
(a) by increasing the concentration of NH₃(g) (b) by decreasing the pressure (c) by […]
For the reaction , X₂O₄(l) → 2XO₂(g) ΔU = 2.1 kcal, ΔS = 20 cal K⁻¹ at 300K Hence, ΔG is
Options
(a) 2.7 kcal (b) -2.7 kcal (c) 9.3 kcal (d) -9.3 […]
2017 Copyright Doctor Dreams Training Academy