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Subject: Chemistry, asked on 30/4/16

1 L of a gas is at a pressure of 10-6 mm of Hg at 25 degree celsius. How many molecules are present in the vessel ?

Answer: 3.2 * 1013 molecules.

Kindly explain.

Subject: Chemistry, asked on 22/7/16

Equimolar solutions of the following substances were prepared separately.Which one of these will record the highest pH value?
1.Barium chloride.
2.Aluminium chloride.
3. Lithium chloride.
4.Beryllium chloride.

Subject: Chemistry, asked on 22/7/16

PLZ GIVE THE ANS

Subject: Chemistry, asked on 30/6/16

Please answer itasap

Subject: Chemistry, asked on 22/6/16

WHAT ARE AMPHIPROTICSUBSTANCES?

Subject: Chemistry, asked on 15/6/16

why is BCl3 not a lewisbase though it has lone pair of electrons?

Subject: Chemistry, asked on 24/5/16

2At a certain temperature following reaction have the equilibrium constant as shown below , S+O2=SO2 kc= 5x10​52 , 2S+3O2=2SO3 Kc=1029 What is the equilibrium constant Kcfor the reaction at the same temperature? 2SO2+ O2=2SO3

Subject: Chemistry, asked on 24/5/16

At 527oC the reaction given below has Kc=4 NH3=1/2 N2+3/2H2,What is the Kpfor the reaction N2+ 3H2=2NH3

Subject: Chemistry, asked on 24/5/16

Consider the reaction 2SO2+O2=2SO3 for which KCl= 278 M-1 .0.001 mole of each reagent of SO2,O2 and SO3are mixed in a 1.0 L flask. Determine the reaction quotient of the system and the spontaneous direction of the system

Subject: Chemistry, asked on 23/5/16

The concentration of [H+] and concentration of [OH-] of 0.1 M aqueous solution of 2% ionised weak acid is (Kw for water = 10-14)
  1. 2*10-3 M and 5*10-12 M
  2. 10-3M and 5*10-12 M
  3. 0.02*10-2 M and 5*10-11 M
  4. 3*10-12 M and 4*10-13 M

Subject: Chemistry, asked on 15/5/16

Lead is precipitated as PbSwhile zinc is not precipitated when H2Sgas is passed through an acidic solution of lead nitrate and zinc nitrate .Explain

Subject: Chemistry, asked on 14/5/16

Q. Assertion: When SnCl2 isaddedto HgCl​2 solution, a milky white precipitate is obtained and on adding excess of SnCl2,a black precipitate is formed
Reason: The disproportionation of Hg (II) is easier then its reduction only.

Subject: Chemistry, asked on 14/5/16

The pH of a solution obtained by mixing 50 ml 0.4N HCl and 50 ml 0.2N NaOh
  1. 1.0
  2. -log 0.2
  3. -log 2
  4. 2.0

Subject: Chemistry, asked on 11/5/16

please explain the question given in the image ASAP

Subject: Chemistry, asked on 30/4/16

One litre of water (Molecular wt. 18.06) weighs 0.9970 kg. find the degree of ionization of water if Kw=1.1*10^-14
at 25 degree celsius

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