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The Arrhenius equation is_________________ .
If the enthalpy of vaporisation of water at 100oC is 186.5 J.mol-1, the entropy of vaporization will be_____________ .
(a) 4.0 J . K-1. mol-1
(b) 3.0 J . K-l. mol-1
(c) 1.5 J - K-1. mol-1
(d) 0.5 J . K-l. mol-1
The atomicity of sulphur in orthorhombic sulphur is______________ .
The major binding force in diamond is_______________ .
(a) Covalent bond
(b) Ionic bond
(c) Metallic bond
(d) Co-ordinate covalent bond
The boiling point of water at high altitude is low. because________________ .
(a) the temperature is low.
(b) the atmospheric pressure is low.
(c) the temperature is high.
(d) the atmospheric pressure is high
The molar conductivity of cation and anion of salt BA are 180 and 220 mhos respectively. The molar conductivity of salt BA at infinite dilution is_____________ .
(a) 90 mhos.cm2
(b) 110 mhos.cm2.mol-1
(c) 200 mhos.cm2.mol-1
(d) 400 mhos.cm2.mol-1
What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?
Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -
(a) Magnetic property
(b) Oxidation state
What is the value of for the following reaction at 298 K -
6CO2+ 6H20(l) → C6H1206(s) + 602(g),
Given that: ΔG° = 2879 kj mol-1, AS = -210 JK-1 mol-1.
Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.
A solution containing 0.73 g of camphor (molar mass 152 g . mol-1) in 36.8 g of acetone (boiling point 56.3°C) boils at 56.55°C. A solution of 0.564 g of unknown compound in the same weight of acetone boils at 56.46oC. Calculate the molar mass of the unknown compound.
Describe triclinic crystal lattice with the help of a diagram.
State and explain Hess’s law of constant heat summation.
Distinguish between : Order and Molecularity of reaction
With the help of the equation ΔG° = - nFEocell. Explain that cell potential is an intensive property.
Describe the laboratory method of preparation of ammonia
Define van’t Hoff factor. How is it related to the degree of dissociation?
Write chemical formulae of the following ores :
Write the reactions involved in extraction of silver from its ore by leaching process. Derive the equation : W = - PextAV
A unit cell of iron crystal has edge length 288 pm and density 7.86 g.cm-3. Find the number of atoms per unit cell and type of the crystal lattice.
Given : Molar mass of iron = 56 g.mol-1; Avogadro's number NA = 6.022 x 1023.
Define : Cryoscopic constant.
What is the action of hot/concentrated nitric acid on -
Draw the structure of: Orthophosphoric acid
How much electricity in terms of Faraday is required to produce :
(a) 20 g of Ca from molten CaCl2
(b) 40 g of Al from molten Al203
(Given : Molar mass of Calcium and Aluminium are 40 g.mol-1 and 27 g.mol-1 respectively.)
Draw the structure of: Pyrophosphoric acid
Which of the followings is a trihydric alcohol ?
(a) n-propyl alcohol
Alkyl halides are -
(a) Mono halogen derivatives of alkanes
(b) Di halogen derivatives of alkanes
(c) Tri halogen derivatives of alkanes
(d) Tetra halogen derivatives of alkanes
Mohr’s Salt is -
(a) Ferrous ammonium sulphate
(b) Ferrous sulphate
(c) Ammonium sulphate
(d) Ferric sulphate
Which of the following is polyamide ?
(b) Nylon 6,6
Vitamin ‘C’ belongs to the class of—
(a) Vitamins of aliphatic series
(b) Vitamins of aromatic series
(c) Vitamins of alicyclic series
(d) Vitamins of heterocyclic series
What is the IUPAC name of
(a) α - Amino butanoic acid
(b) 2 - Amino butyric acid
(c) α - Amino butyric acid
(d) 2 - Amino butanoic acid
Which among the following molecular formulae represents urotropine?
Write the structures of - 3-chloro-3-ethylhex-1-ene
Write the structures of -1-Iodo-2, 3-dimethylbutane
Write the structures of - 1, 3, 5 - tribromobenzene
What is the action of acidified potassium dichromate on -
Draw structure of dichromate ion
Describe laboratory method for preparation of glucose.
Write the reaction that indicates the presence of -CHO group in glucose
What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on -
(a) ethyl amine
(c) triethyl amine
What are chemical twins? Write ‘two’ examples.
Explain the term Antiseptics
Explain trem Analgesics.
Draw the simple Fisher projection formulae of D - (+) - glucose and D - (-) — fructose
Classify the following ligands into monodentate and polydentate —
- Carbon monoxide
- Ethylene diamine
- Ethylene diamine tetra acetate ion
State and explain Markownikoff's rule with suitable example
How are propan-1-amine and propan-2-amine prepared from oxime?
Identify ‘A' and ‘B’ in the following reaction :
C6H5MgBr + C02 `(`> ‘A’ `(PCl_5)/()`> ‘B’
What is the action of the following reagents on phenol -
(a) Bromine in CS2 at low temperature.
(b) H2S04 at room temperature.
Write balanced chemical equations for action of ammonia on - (a) formaldehyde (b) acetaldehyde (c) acetone