The hybridisation of phosphorus in phosphorus pentachloride is _______.
(B) sp3 d
(C) d2 sp3
(D) sp3 d2
The rate constant for a first order reaction is 100 s–1. The time required for completion of 50% of reaction is _______.
(A) 0.0693 milliseconds
(B) 0.693 milliseconds
(C) 6.93 milliseconds
(D) 69.3 milliseconds
Silica is added to roasted copper ore during smelting process to remove _______.
(A) ferrous sulphide
(B) ferrous oxide
(C) cuprous sulphide
(D) cuprous oxide
96500 coulombs correspond to the charge on how many electrons?
(A) 1.6 X 1019
(B) 6.022 X 1020
(C) 6.022 X 1023
(D) 6.022 X 1024
For the reaction: Cl2(g) → 2Cl(g), _______.
(A) ΔH is positive, ΔS is positive
(B) ΔH is positive, ΔS is negative
(C) ΔH is negative, ΔS is negative
(D) ΔH is negative, ΔS is positive
The substance ‘X’, when dissolved in solvent water gave molar mass corresponding to the molecular formula ‘X3’. The van’t Hoff factor (i) is _______.
The relation a ≠ b ≠ c and α ≠ β ≠ γ represents which crystal system?
What is the hybridisation of carbon atom in diamond and graphite?
0.1 mole of Buckminster fullerene contains how many kg of carbon? [Atomic mass of carbon = 12]
Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.
A solution of glucose in water is labelled as 10% (W/W).
b. Molarity of the solution.
[Given: Density of solution is 1.20 g mL-1 and molar mass of glucose is 180 g mol-1 ]
Resistance of conductivity cell filled with 0.1 M KCl solution is 100 ohms. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 ohms, calculate the conductivity and molar conductivity of 0.02 M KCl solution. [Given: Conductivity of 0.1 M KCl solution is 1.29 S m-1 .]
Ammonia and oxygen react at high temperature as:
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) In an experiment, rate of formation of NO(g) is 3.6 x 10-3 mol L-1 s -1.
a. Rate of disappearance of ammonia.
b. Rate of formation of water.
What is the effect of temperature on solubility of a gas in a liquid?
Explain refining of nickel by Mond process.
State Kohlrausch’s law of independent migration of ions.
Silver crystallises in F.C.C. (face-centred cubic crystal) structure. The edge length of the unit cell is found to be 408.7 pm. Calculate density of the unit cell.
[Given: Molar mass of silver is 108 g mol-1 ]
Write ‘four’ uses of hydrochloric acid.
Write chemical formula of the following oxoacids of chlorine:
a. Hypochlorous acid
b. Chlorous acid
c. Chloric acid
d. Perchloric acid
The equilibrium constant Kp for the reaction,
H2(g) + I2(g) → 2HI(g) is 130 at 510 K. Calculate ΔGo for the following reaction at the same temperature: 2HI(g) → H2(g) + I2(g) [Given: R = 8.314 J K-1 mol-1 ]
Which among the following reducing agents is NOT used to reduce acetaldehyde to ethyl alcohol?
(A) Na-Hg and water
(B) Zn-Hg and conc. HCl
(C) H2-Raney Ni
Acetaldehyde, when treated with which among the following reagents does NOT undergo addition reaction?
(C) Ammoniacal silver nitrate
What is natural rubber?
(D) Butyl rubber
What is salvarsan?
(A) An antiseptic
(B) An antibiotic
(C) An antifertility drug
(D) An analgesic
The amine which reacts with nitrous acid to give yellow oily compound is _______.
(C) secondary butylamine
What is the molecular formula of chromyl chloride?
Identify ‘A’ and ‘B’ in the following reaction :
CH3 - CH = CH2 `(HBr)/()` ‘A’ `(alc. KOH)/()` ‘B’
How are the following compounds prepared?
a. Benzyl alcohol from benzyl chloride.
b. Propan-1-ol from propanal
What is the action of nitrous acid on:
a. primary nitroalkane?
b. secondary nitroalkane?
c. tertiary nitroalkane?
Write the reactions involved in the preparation of Teflon
Write the reactions involved in the preparation of Orlon
Write the reactions involved in the preparation of PVC
What is the position of iron (Z = 26) in periodic table?
Explain why is Fe3+ more stable than Fe2+?
Discuss the mechanism of alkaline hydrolysis of bromomethane.
How is carbolic acid prepared from chlorobenzene?
What is the action of bromine water on carbolic acid?
Write chemical test to distinguish between carbolic acid and alcohol.