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Define boiling point
Define cell constant.
Derive a relation between ΔH and ΔU for a chemical reaction. Draw neat labelled diagram of calomel electrode. Resistance and conductivity of a cell containing 0.001 M KCI solution at 298K are 1500Ω and 1.46x10-4 S.cm-1 respectively.
What is calcination?
Write molecularity of the followiug reaction:
What is 'calcination'? How does it differ from 'roasting"?
Write resonating structures of ozone.
The decomposition of N2O5(g) at 320K according to the following equation follows first order reaction:
The initial concentration of N2O5(g) is 1.24 x 10-2 mol. L-1 and after 60 minutes 0.20x10-2 mol L-1. Calculate the rate constant of the reaction at 320K.
One mole of a gas expands by 3L against a constant pressure of 3 atmosphere. Calculate the work done in -
Calculate the amount of CaCl2 (van't Hoff factor i = 2·47) dissolved in 2·5 L solution so that its osmotic pressure at 300K is 0·75 atmosphere.
Given : Molar mass of CaCl2 is 111g mol-1
R=0.082 L.atm K-1mol-1
Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :
(a) Hydrogen bonding
(b) Oxidation state
(c) Polyhalide ions
Face centred cubic crystal lattice of copper has density of 8.966 g.cm-3. Calculate the volume of the unit cell. Given molar mass of copper is 63.5 g mol-1 and Avogadro number NA is 6.022 x 1023 mol-1
What is the action of the following reagents on ammonia:
(a) Nessler's reagent
(b) Sodium metal
Derive the relation between `DeltaG^@`and equilibrium constant (K) for the reaction -
aA_bB ⇌ cC+dD.
To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:
Number of faradays of electricity required to liberate 12 g of hydrogen is:
Purification of aluminium by electrolytic refining is carried out by
The rate of reaction for certain reaction is expressed as :
The reaction is
A system absorbs 640 J heat and does work of 260 J, the change in internal energy of the system will be
(a) + 380 J
(b) - 380 J
Which of the following is not a colligative property?
(a) Vapour pressure
(b) Depression in freezing point
(c) Elevation in boiling point
(d) Osmotic pressure
Write the structural formula and IUPAC names of all possible isomers of the compound with molecular formula C3H8O.
Write 'two' uses of phenol.
What happens when glucose is treated with -
(a) Bromine water
(b) Dilute nitric acid
(c) Hydrogen cyanite (HCN)
Write the molecular formula and structural formula of BHA and BHT.
What are thermoplastic polymers?
Write a note on aldol condensation.
What is the action of the following reagents on aniline?
(c)Hot and cone. sulphuric acid
Write balanced chemical equations for action of potassium permanganate on:
(b) Warm conc. sulphuric acid
Explain why Mn2+ ion is more stable than Mn3+? (Given : Mn→ Z=25)
What is effective atomic number (EAN.)?
Calculate EAN of cobalt (Z=27) in [CO(NH3)6]+3 and of zinc (Z=30) in [Zn(NH3)4]SO4.
IUPAC name of K4[Fe(CN)6] is
(a) tetrapotassium ferrocyanide
(b) potassium ferricyanide
(c) potassium ferrocyanide
(d) potassium hexacyanoferrate
Carbon atom in methyl carbocation contains how many pairs of electrons?
How many moles of acetic anhydride will be required to form glucose pentaacetate from 2M of glucose?
Identify the weakest base amongst the following :
(a) p- methoxyaniline
(c) benzene - 1, 4 - diamine
(d) 4 - aminobenzoic acid
Bakelite is the polymer of:
(a) Benzaldchyde and phenol
(b) Acetaldehyde and phenol
(c) Formaldehyde and phenol
(d) Formaldehyde and benzyl alcohol
Formalin is 40% aqueous solution of:
(b) Methanoic acid