Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

How will you distinguish between dispersed phase and dispersion medium in an emulsion?

Match the items of Column I with items of Column II and assign the correct code:

Chloromethane on treatment with excess of ammonia yields mainly ______.

Why iodoform has appreciable antiseptic property?

Name the alkene which will yield 1-chloro-1-methylcyclohexane by its reaction with \[\ce{HCl}\]. Write the reactions involved.

Diphenyls are potential threat to the environment. How are these produced from arylhalides?

What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in India and other countries?

How will you obtain monobromobenzene from aniline?

How can you obtain iodoethane from ethanol when no other iodine-containing reagent except NaI is available in the laboratory?

Match the compounds given in Column I with the effects given in Column II.

Assertion: It is difficult to replace chlorine by –OH in chlorobenzene in comparison to that in chloroethane.

Reason: Chlorine-carbon \[\ce{(C - Cl)}\] bond in chlorobenzene has a partial double bond character due to resonance.

Some halogen containing compounds are useful in daily life. Some compounds of this class are responsible for exposure of flora and fauna to more and more of UV light which causes destruction to a great extent. Name the class of these halocompounds. In your opinion, what should be done to minimise harmful effects of these compounds.

Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?

(i)

\[\begin{array}{cc}
\ce{(CH3)2CH - CH - COOH}\\
\phantom{..}|\\
\phantom{.....}\ce{NH2}
\end{array}\]

(ii)

\[\begin{array}{cc}
\ce{HOOC - CH2 - CH2 - CH - COOH}\\
\phantom{............}|\\
\phantom{...............}\ce{NH2}
\end{array}\]

(iii)

\[\ce{H2N - CH2 - CH2 - CH2 - COOH}\]

(iv)

\[\begin{array}{cc}
\ce{HOOC - CH2 - CH - COOH}\\
\phantom{.....}|\\
\phantom{........}\ce{NH2}
\end{array}\]

Assertion: Glycine must be taken through diet.

Reason: It is an essential amino acid.

Which of the following is not a semisynthetic polymer?

The commercial name of polyacrylonitrile is ______.

Which of the following polymers, need atleast one diene monomer for their preparation?

(i) Dacron

(ii) Buna-S

(iii) Neoprene

(iv) Novolac

Name the polymers used in laminated sheets and give the name of monomeric units involved in its formation.

Match the polymers given in Column I with the type of linkage present in them given in Column II.

Match the polymers given in Column I with their repeating units given in Column II.

Column I	Column II
(i) Acrilan	(a) \[\begin{array}{cc} \ce{-(CH2 - CH)\underset{n}{-}}\\ \phantom{....}|\\ \phantom{.......}\ce{C6H5} \end{array}\]
(ii) Polystyrene	(b) \[\begin{array}{cc} \ce{Cl}\phantom{.......}\\ |\phantom{........}\\ \phantom{}\ce{-(CH2 - C = CH - CH2)\underset{n}{-}} \end{array}\]
(iii) Neoprene	(c) \[\begin{array}{cc} \phantom{................................}\ce{CN}\\ \phantom{..............................}|\\ \ce{-(CH2 - CH = CH - CH2 - CH2 - CH)\underset{n}{-}} \end{array}\]
(iv) Novolac	(d) \[\begin{array}{cc} \ce{-(CH2 - CH)\underset{n}{-}}\\ \phantom{.....}|\\ \phantom{.......}\ce{CN} \end{array}\]
(v) Buna—N	(e)
	(f)  \[\begin{array}{cc} \ce{-(CH2 - CH)\underset{n}{-}}\\ \phantom{.....}|\\ \phantom{......}\ce{Cl} \end{array}\]