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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 integrated rate equation for first order reaction is A → products
(a) `k=2.303t log_10([A]_@/[A]_t)`
(c) `k=2.303/t log_10 ([A]_t/[A]_0 )`
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?
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 formula and structure of 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
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
Explain Interstitial compounds
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.
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 effects of lanthanoid contraction
What are the consequences of lanthanoid contraction?
Write a note on Gabriel phthalimide synthesis.
What are biodegradable polymers and non-biodegradable polymers? Write ‘one example’ of each.
Explain cationic detergents.