Frequent Chemistry Questions

Given: Ag(NH3)2 1Ag+2NH3, Kc=6.2*10^-8 and Ksp of AgCl=1.8*10^-10 at 298K. if ammonia is added to water solution containing excess of Agcl(s) only .Calculate the concentration of complex in 1M aqueous ammonia ...

1. Mn2+ +2H2O *Image* MnO2 +4H++2e- E0= -1.23 MnO4- +4H++3e- *Image* MnO2+2H2O E0=+1.70 Select correct statement[s]: a.Mn2+ reacts with MnO4- in acid solution to form MnO2 b.Mn(MnO4)2 is stable in acid soln. c.MnO2 di ...

In Test 502 of class 8, I got only one question wrong.The instructions said that +3 is for correct response and -1 for a wrong response.However I got 31 out of 40.How? ...

2.5 litres of 1M NaOH solution is mixed with 3 litres of 0.5M NaOH solution. What is the molarity of the resulting solution? ...

whats the mechanism?? *Image* ...

Molarity of a solution of sulphuric acid is 0.8M and its density is 1.06 g/cc. Find the molality and mole fraction of the solution. ...

What is disiamyl borane and DBN? ...

*Image* ...

*Image* ...

Which of these are not indicators ? a) Tumeric b) Purple cabbage c) Methyl Orange d) Crystal violet ...

Arrange HCL, CH3COOH and H3O+ in order of decreasing strength. ...

Why are Group 18 elements bigger in size than Group 17 elements? ...

Why is pyridine used in the reaction of R-OH + PCl3 to make R-Cl? ...

What explains the fact that methanol reacts with HX faster than a primary alcohol? ...

Which of the following is not a way to prevent resuting a) Painting the Iron b) Galvanization of the Iron c) Proper solidification of molten Iron d) Chemical treatment of the Iron Your Answer c Correct Answer a Your Score-1 H ...

Menthol,a flavouring agent obtained from peppermint oil,contains carbon,hydrogen and oxygen. On combustion analysis, 1g of menthol yields 1.161g of water and 2.818g of carbon dioxide. What is the empirical formula of menthol? ...

In addition to carbon monoxide and carbon dioxide, there is a third compound of carbon and oxygen called carbon suboxide. If a 2.5g sample of carbon suboxide contains 1.32g of carbon and 1.18g of oxygen, show that the law of ...

Which of the following is not a way to prevent resuting a) Painting the Iron b) Galvanization of the Iron c) Proper solidification of molten Iron d) Chemical treatment of the Iron ...

A mixture of FeO and Fe3O4 when heated in air to constant weight gains 5% in its weight .The % of FeO in the sample is? ...

what is the mechanism for the intramolecular wurtz reaction? ...

a) A 2.36 g sample of dolomite containing CaC03 and MgC03 were dissolved in 700 ml_ of decinormal solution of HCI. The solution was diluted to 2.5L and 25mL of this solution required 20 mL 0.01 N NaOH solution for complete ne ...

A syringe contains 60.0 mL of air at 740 mm Hg pressure and 20oC. What would be the temperature at which the syringe would contain 30.0 mL at a pressure of 370 mm Hg? (Assume no gas could leak in or out of the syringe.) a) -2 ...

Find the spin magnetic moment of Hg[Co(SCN)4] ...

when NaCl is doped with MgCl2 the nature of the defect produced is? explain ...

The frequency of one of the spectral lines in the Paschen series is 2.34 * 1014 Hz. Find the principal quantum number which produces this radiations. (Please show your working) ...

Arrange O2-,F-,Na+ and Mg2+ in ascending order in terms of their: a)Effective nuclear charge b)Atomic size c)Ionization potential d)Electron affinity ...

At ordinary temperature and pressure,chlorine is a gas,bromine is a liquid while iodine is a solid. Is this because of their specific heat,intermolecular force among the molecules,density or stability? ...

Give the correct order of electronegativity of the central atom in the following compounds : a) CH3 - CH3(Ethane) 4) CH2 = CH2(Ethene) 5) CH ≡ CH (Ethyne) Also give your reasoning for the same. ...

*Image* ...

surrounding groups affect the energy of some of d orbital more than the others. thus, the d orbtals are no longer degenerate- why should surrounding groups affect the energy of some d orbital more than the others when they r ...