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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... 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... 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 [Cu(CN)4]3−... 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... 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... 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... 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... 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... 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... 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 temperature. Whereas other... 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... 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... View Article

The oxide of an element possess the formula M2O3. If the equivalent weight of the metal is 9, then the atomic weight of the metal will be

Solution The formula of the oxide is M2O3. The valence of the Metal = 3 Equivalent of the metal =... View Article

The number density of molecules of a gas depends on their distance r from the origin as, [latex]n(r)=n_{0}e^{-alpha r^{4}[/latex]. Then the total number of molecules is proportional to:

Solution: Given number density of molecules of gas as a function of r is \(\begin{array}{l}n(r)=n_{0}e^{-\alpha r^{4}} \end{array} \)Total number of... View Article

Calculate force per unit length acting on the wire B due to the current flowing in the wire A. (See the figure below).

Solution: Since current in both the wires is flowing in the same direction, both wires will attract each other. Force... View Article

Two masses m_(1) and m_(2) are experiencing the same force where m1< m2 the ratio of their acceleration frac{a_{1}}{a_{2}}is

a) 1 b) less than 1 c) Greater than 1 d) All the options Solution: c) Greater than 1 Explanation: for... View Article

With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Å is observed at 5896 Å?

(1) 306 km/sec (2) 322 km/sec (3) 296 km/sec (4) 336 km/sec Solution:(1) 306 km/sec \(\begin{array}{l}f=f_{0}=\sqrt{\frac{1+\beta}{1-\beta}}\end{array} \) \(\begin{array}{l}\frac{f}{f_{0}}\sqrt{\frac{1+\beta}{1-\beta}}\end{array} \) \(\begin{array}{l}[1+\frac{\Delta... View Article

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