Answers to chemistry questions posted on 01/08/13

1) Which hydrocarbon cannot be obtained through Kolbe's electrolytic method?
[asked by: Sujan Halder]

neetpcb Answer: Methane cannot be obtained.

2) Which, among Flyash, Soot, Inorganic compounds and Smog is the most toxic?
[asked by: Janhavi Tiwari]

neetpcb Answer: Soot is considered the most toxic.

Answers to chemistry questions asked on 31/07/13

1) What do you understand by auto-ionisation of water?
[asked by: Shelly Ghosh]

neetpcb Answer: Auto ionisation of water is the spontaneous reaction between two water molecules in which they react to give hydronium and hdroxyl ions.

2H2O --> H3O+ + OH-

2) Give some properties of Boric Acid.

[asked by: Stephen Chawla]

neetpcb Answer: 

• Boric Acid is a white-crystalline substance.
• It has a layer in which planar BO3 units are joined by H-bonds.
• It is a weak monobasic acid.

3) Give some uses of super-critical Carbon Monoxide.

[asked by: Shubham Kashyap]

 

neetpcb Answer:  Super-critical Carbon Monoxide is used as a solvent to extract organic compounds from their natural sources (eg.: caffeine from coffee beans)

Answers to chemistry questions asked on 30/07/13

1) What are minimum boiling azeotropes?
[asked by: Amit Verma]

neetpcb Answer: Non-ideal solutions showing large positive devitation from Raoult's Law form minimum boiling azeotropes which boil at temperature, lower than the boiling points of the individual components.
eg: Water and benzene solution

2) Name an alkane with general formula of CnH2n.
[asked by: Deepak Sadhu]

neetpcb Answer: All cyclic alkanes like cyclepropane, cyclobutane, etc. are examples of such compounds.