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Calculate the number of moles of hydrogen gas present in 500cm^3 of the gas taken at 300k and 760mm pressure. If this sample of hydrogen is found to have a mass equal to 4.09×10^{-2}g , calculate the molar mass of hydrogen.

Consider the following reaction : The final product Z is -

What is the vapour pressure of a solution at 100∘C containing 18 g of water and 1.71 g of sucrose (non-volatile)? Given: Molecular formula of sucrose is C12H22O11 At 100∘C, vapour pressure of pure water is 1 atm.

5.0 cm3 of H2O2 liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H2O2 solution in terms of volume strength at S.T.P.

The Van't Hoff factor calculated from association data is always ________ than calculated from dissociation data.

How chemical equilibrium is attained?

Which of the following is not a molecular hydride?

ntWhat are Aldol and Crossed Aldon reactions? Provide mechanismsn

the hybridisation state of the central atom in HgCL2 is

What is meant by strong nuclear force?Is it always attractive?What effect does it have on potential energy?

if 'b' increases then which of the following is incorrect ? (a)effective size of molecule will increase (b)compressible volume will decrease (c) incompressible volume will increase (d)effective size of molecule will decrease

Propionic acid with Br2|P yields a dibromo product. Its structure would be:

80.How many moles of CO is required to form 242 g Re2(CO)10 (g) Re2O7+CO----Re2(CO)10+ CO2

All of the following are chain isomers of each other, except one. Which is the exception?

36. in which case pH will not change on dilution upto 100 times (1)0.01 M ch3coona + 0.01 Mch3cooh (2)0.01 M CH3COONH4 (3)0.01M NH4CN (4)all of the above

A negligibly smallcurrent is passed through a wire of length 15 m and uniformcross-section 6.0 × 10−7 m2, andits resistance is measured to be 5.0 Ω.What is the resistivity of the material at the temperature of theexperiment?

Which of the following elements shows +7 oxidation state?

Reagent(s) used in the conversion of R−CH2−OH→R−CH3:

a point charge q is placed at a dis†an ce of 2r from centre of a uncharged metallic shell of radius r potential ata point p at a distance of r/2 from centre of shell dueto induced charge i

M+3 ion loses 3e−. Its oxidation number will be

Which of the following alkene would produce the product shown in the reaction ?

P4 (white phosphorus) when treated with thionyl chloride produces phosphorus ___. On the other hand if P4 (white phosphorus) is treated with sulphuryl chloride we get phosphorus ___.

For a thermodynamically spontaneous process the change in free energy is __.

when sodium benzoate reacts wiith NaOH what are the products?

The process of applying an adhesive is-

An electron is moving in 3rd orbit of li+2 and its separation energy is y. The separation energy of an electron moving in 2nd orbit of He+ is

Let R be a relation from A {1, 2, 3, ) to B (1, 3, 5) such that R{(a,b):a

42. What will be the product when 1-bromo-3-iodocyclobutane reacts with (1) 1 mole of Mg/ether (2) excess of Mg/ether

The change in entropy of 2 moles of an ideal gas upon isothermal expansion at 243.6 K from 20 L until the pressure becomes 1 atm is :

40.Why AB3L3 types are not possible in nature where A is central atom and B is Bonded atoms and L is lone pair. Note:consider every bond as single bond

Which is not Variable? A. Valency B. Molecular Weight C. Equivalent Mass D. All Above

When 50 cm3 of 0.2N H2So4 is mixed with 50 cm3 of 1 N KOH the heat liberated is (given H+(aq)+OH-(aq)gives H2O(l);del neutralizationH=-57.3kJ

In which of the following is the removal of Cl− most difficult?

1.Which of the following is the most stable carbocation? (1)ch3-ch†extbullet-CN (2)ch3-ch†extbullet-och3 (3)ch3-ch†extbullet-NO2 (4)ch3-ch†extbullet-ch3 dot on ch represents carbocation

Which of the following is most basic?

Which is the s†an ard state of phosphorus is

31.A sugar solution with concentration 8.5% (w/w) is made by dissolving 'x'g of sugar in 450 g of water. The amount of 'X'is (1) 49.2g. (2) 45.3 g (3) 41.80 g. (4) 35 g

The efficiency of fuel cell is 80% and the standard heat of reaction is -300kJ , then find the standard emf of cell A) 1.24V B) 2.48V C) 0.31V D) 0.62V

Which of the following compounds is/are aromatic in nature?

The most stable conformational isomer of given compound will be

6. Among [Ni(CO)4], (NiCl4]2-, [Co(NH3)4Cl2]CI, Na3 [CoF6] , Na202, and Cs02, the total number of paramagnetic compounds is (a) 2 (b) 3 (6) 4 (d) 5

The trihydroxypropane react with HI (1mole)

Salicylic acid gives oil of winter green when treated with :

0.25 gm pf colloidal is added yo 100ml gold solution to prevenf the coagulation on adding 1 ml 10%NaCl solution. What will be the gold number pf lyophillic colloid

In the reaction of glucose with hydroxyl amine and glucose with hydrogen cyanide how was it conuded that glucose has only one carbonyl group ?

How to find no of atoms in a molecule

A solution has 1:4 mole ratio of pentane to hexane. The vapour pressureof the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane The mole fraction of pentane in the vapour phase would be

Propose structures for hydrocarbons that give the following products on oxidative cleavage by KMnO4 or O3:

3Give reasons for the following:-(1)p- nitrochlorobenzene undergoes nucleophilic substitution faster thanchlorobenzene. Explain giving the resonating structure as well. (ii) lodoform is obtained by reactions of acetone with hypoiodite ion but not I' ion.OR(ii)C

4. Which of the following is least reactive in nucleophilic substitution reaction? 1) (CH3)3C-Cl 2) CH2=CH-Cl 3) CH3CH2-Cl 4) CH2=CHCH2-Cl

P4 (white phosphorus) when treated with thionyl chloride produces phosphorus _. On the other hand if P4 (white phosphorus) is treated with sulphuryl chloride we get phosphorus _.