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o2 and so2 gases are filled in the ratio of 1:3 by mass in a closed container of 3L at temp of 27 degree celsius . the partial pressure of O2 is 0.60atm , the concentration of SO2 would be

Solution: Let the mass of O2 is x and the mass of SO2 is 3x Partial pressure of O2 is pO2 = XO2 x Ptotal Partial pressure of O2 = 0.60 atm... View Article

1.2 g of organic compound on kjeldahl method liberates ammonia which consumes 30 cm3 of 1 N HCl. The percentage of nitrogen in the organic compound is

The organic compound (w) = 1.2 g Ammonia consume = 30 cm3 = 30 ml Normality of HCl = 1N Percentage of Nitrogen = {1.4 x N x V(ml)}/ w(gm) =... View Article

which of the following is correct for reaction of chiral substrate ?

(A) A reaction in which different stereoisomers produce different products or act at different rates is called stereospecific reaction. (correct)... View Article

In the standardisation of Na₂S₂O₃ using K₂Cr₂O₇. The equivalent weight of K₂Cr₂O₇is:

An equivalent weight of a solution is defined as the molecular weight of the solute divided by the valence of the solute. Equivalent weight is... View Article

which one of the following has the lowest boiling point? a)H₂O b) H₂Te c) H₂Se d) H₂S.

Answer: (d) H2S. The boiling point of a liquid is the temperature at which the vapour pressure of the liquid becomes equal to the atmospheric... View Article

mercury boils at 356 degrees celsius However, mercury thermometers are made such that they can measure temperatures up to 500 degree celsius. This is done by

The boiling point of mercury is 356°C. By filling nitrogen gas at high pressure, the boiling point of mercury is increased upto 500∘C.... View Article

unknown gas diffuses with co2 Rate of diffusion of unknown gas is double than that of CO2. The molecular weight of the unknown gas is

Let M1 is the mass of CO2 = 44 gm M2 is the mass of unknown gas r1 is the rate of diffusion of CO2 r2 is the rate of diffusion of unknown gas... View Article

in the reaction VO + Fe2O3 →FeO+V2O5, the eq.wt.of V2O5 is equal to its

Solution: VO + Fe2O3 ⟶ FeO + V2O5 Oxidation number of V in VO=+2 Oxidation number of V in V2O5 =+5 Change in oxidation number of one V... View Article

in the complexes fe(h2o)6 3+ [Fe(CN)6] 3−,[Fe(C2O4)3]3−and [FeCl6] 3−, more stability is shown by :

Solution: Among them [Fe(C2O4)3]3− complex is more stable. Stability of the complex is due to chelation. Oxalate is a bidentate ligand and... View Article

which of the following is not thermodynamic function (a) Enthalpy, (b) workdone (c) Gibbs energy (d) Internal energy

Solution : (b) Work done Enthalpy, Gibbs energy and internal energy are thermodynamic functions . They are the state functions which depend... View Article

CuSO4 dissolves in excess of KCN to give

Solution: When copper sulphate dissolves in excess potassium cyanide, it form potassium sulphate (K2SO4) and insoluble Copper cyanide complex ... View Article

The metal oxide is yellow when hot white when cold .The metal oxide is

Solution: Zinc oxide is white in color but on heating it turns into yellow. On heating ZnO shows metal excess defect. Due to the presence of... View Article

chemical formula of tear gas is

Solution: The chemical formula of tear gas is C10H5ClN2 (2-chlorobenzalmalononitrile). It is used in spray form by many police forces as a... View Article

among the following the molecule expected to be stabilized by anion formation is C2, O2, NO, F2

Solution: The electronic configuration C2 :(σ1s)2 (σ*1s) 2(σ2s)2 (σ *2s)2 (π 2px2= π 2py2) Bond order = (number of electrons in bonding MOT –... View Article

A 100cm3 solution is prepared by dissolving 2g of NaOH in water. Calculate the normality of the solution

Solution Given weight of NaOH=2g Molecular weight of NaOH=40g Equivalent weight of NaOH = (Molecular weight/valency) = 40g/1 = 40g Volume of... View Article

Average atomic mass of magnesium is 24.31 amu this magnesium is composed of 79 mole% of 24Mg and remaining 21 mole% of 25Mg and 26Mg. Calculate mole% of 26Mg

Solution: Average atomic mass of magnesium = 24.31 amu Mole % of 24Mg = 79 Mole % of 25Mg and 26Mg = 21 Now, let x be the mole % of 25Mg and... View Article

Which one of the following is not a device used to control a particulate matter (a) Arresters (b) Scrubbers (c) Filters (d) Electrostatic precipitator (e) Incinerator

Solution : (e) Incineration is not a device used to control a particulate matter. It is a waste treatment process that involves the combustion... View Article

alkali which dissociates only partially in aqueous solution 1. Lithium hydroxide 2. Calcium hydroxide 3. Potassium hydroxide 4. Sodium hydroxide

Calcium hydroxide (Ca(OH)2) is dissociated partially in aqueous solution. Solubility of Calcium hydroxide decreases with increases in... View Article

The charge used for the oxidation of one mole Mn3O4 into MnO42− in presence of alkaline medium is

Solution: The reaction in alkaline medium is Mn3O4 + OH- → MnO42− The oxidation sate of Mn in Mn3O4; 3x + 4(-2) = 0, x = 8/3 The oxidation sate... View Article

In a reaction A + B2 → AB2, identify the limiting reagent, if any, in the following reaction mixtures.(i) 300 atoms of A + 200 molecules of B 2(ii) 2 mol A + 3 mol B2(iii) 100 atoms of A + 100 molecules of B2(iv) 5 mol A + 2.5 mol B2(v) 2.5 mol A + 5 mol B2

Solution (i) Here B2 will be the limiting reagent because 200 molecules of B will react with 200 atoms of A and 100 atoms of A will remain... View Article

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