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p - type semi-conductors are made by mixing silicon with impurities of-
Amongst the following identify the criterion for a process to be at equilibrium -
- ΔG < 0
- ΔG > 0
- ΔS < 0
Colligative property depends only on ........................ in a solution.
- Number of solute particles.
- Number of solvent particles.
- Nature of solute particles.
- Nature of solvent particles.
The charge of how many coulomb is required to deposit 1.0 g of sodium metal (molar mass 23.0 g mol-1) from sodium ions is -
What is the chemical composition of malachite?
- CuO . CuC03
- Cu(OH)2 CuC03
- Cu2O . Cu(OH)2
The element that does NOT exhibit allotropy is
The integrated rate equation for first order reaction is A → products
(c) `k=2.303/t log_10 ([A]_t/[A]_0 )`
Derive van’t Hoff general solution equation
Explain impurity defect in stainless steel with diagram
Derive the relation between half life and rate constant for a first order reaction
Draw neat and labelled diagram of dry cell.
Explain the structure of sulphur dioxide.
Arrange the following reducing agents in the order of increasing strength under standard state conditions. Justify the answer
Determine whether the reactions with the following ΔH and ΔS values are spontaneous or non-spontaneous. State whether the reactions are exothermic or endothermic.
(a) ΔH = -110kJ, ΔS = + 40JK-1 at 400 K
(b) ΔH = + 40kJ, ΔS = -120JK-1 at 250K
1.0 x10-3Kg of urea when dissolved in 0.0985 Kg of a solvent, decreases freezing point of the solvent by 0.211 k.
1.6x10 Kg of another non-electrolyte solute when dissolved in 0.086 Kg of the same solvent depresses the freezing point by 0.34 K. Calculate the molar mass of the
another solute. (Given molar mass of urea = 60)
Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t1/2= 3 hours. What fraction of the sample of sucrose remains after 8 hours?
Explain how does nitrogen exhibit anomalous behaviour amongst group 15 elements.
Niobium crystallises as body centred cube (BCC) and has density of 8.55 Kg / dm-3 . Calculate the attomic radius of niobium.
(Given : Atomic mass of niobium = 93).
Write one statement of first law of thermodyamics and its mathematical expression.
Write the reactions involved in th'e zone of reduction in blast furnace during extraction of iron.
Write molecular formulae and structures of Dithionic acid
Write molecular formulae and structures of the Peroxy monosulphuric acid
Write molecular formulae and structures of the Pyrosulphuric acid
Write molecular formulae and structures of the Dithionous acid
Calculate E and AG for the following at 28°C:
Mg(s) + Sn2+(0.04M) → Mg2+(0.06M) + Sn(s)
Ecell = 2.23V
Is the reaction spontaneous?
Identify the product ‘D’ in the following sequence of reactions:
- 2,2 - dimethyl butane
- 2,3- dimethylbutane
- 2,4 - dimethylpentane
Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate?
- [Cr(NH3)4SO4] Cl
- [Co(NH3)4Cl2] NO2
What is the geometry of chromate ion?
- Trigonal planer
Primary and secondary nitroalcanes containing α - H atom show property of -
- chain isomerism
- optical isomerism
- geometrical isomerism
In phenol carbon atom attached to -OH group undergoes -
- SP3 hybridisation
- SP hybridisation
- SP2 hybridisation
- No hybridisation
Identify the strongest acid amongst the followings:
- Chloroacetic acid
- Acetic acid
- Trichloroacetic acid
Which of the following vitamins is water soluble?
Write a note on Friedel Craft’s acylation.
How is ethyl amine prepared from methyl iodide?
What are antibiotics? Give ‘two’ examples
Explain, why are boiling points of carboxylic acids higher than corresponding alcohols
How are proteins classified on the basis of molecular shapes?
Explain Interstitial compounds
What are interstitial compounds?
What are interstitial compounds? Why are such compounds well known for transition metals?
Why do interstitial compounds have higher melting points than corresponding pure metals?
Write the structures and IUPAC names of the :Adipic acid compound
Write the structures and IUPAC names of the α - methyl butyraldehyde.
Explain with examples, branched and linear polymers.
On the basis of valence bond theory explain the nature of bonding in [CoF6]3 ion.
Write the IUPAC name of [Co(N02)3(NH3)3].
Define lanthanoid contraction. Explain its effects.
What is lanthanoid contraction? What are the consequences of lanthanoid contraction?
Write mechanism of Aldol addition reaction.
What are carbohydrates?
What are reducing and non-reducing sugars?
Write a note on Gabriel phthalimide synthesis.
What are biodegradable polymers and non-biodegradable polymers? Write ‘one example’ of each.
Explain cationic detergents.