Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Why are the boiling points of organohalogen compounds comparatively higher than the corresponding hydrocarbons?
The NCERT text explains: 'The boiling points of organohalogen compounds are comparatively higher than the corresponding hydrocarbons because of strong dipole-dipole and van der Waals forces of attraction.'
Chloramphenicol, a chlorine-containing antibiotic, is produced by microorganisms and is effective for treating:
The NCERT text mentions: 'Chlorine containing antibiotic, chloramphenicol, produced by microorganisms is very effective for the treatment of typhoid fever'.
What is the classification of dihalo-compounds where both halogen atoms are present on the same carbon atom of the aliphatic chain?
The NCERT text states: 'The dihalo-compounds having both the halogen atoms are further classified as geminal halides or gem-dihalides when both the halogen atoms are present on the same carbon atom of the aliphatic chain.'
Many volatile halogen compounds possess what distinct physical property?
The NCERT text states: 'Many volatile halogen compounds have sweet smell.'
The relation between $n_m$ ($n_m$ = the number of permissible values of magnetic quantum number $m$) for a given value of azimuthal quantum number ($l$), is:
$n_m = 2l + 1\Rightarrow l = (n_m - 1)/2$.
The element expected to form largest ion to achieve the nearest noble gas configuration is:
N gains 3 electrons to give $N^{3-}$ (isoelectronic with Ne) — largest among the listed ions because of greatest electron-electron repulsion / lowest $Z_{eff}$.
Which amongst the following molecules on polymerization produces neoprene?
Neoprene = poly(chloroprene); chloroprene is 2-chloro-1,3-butadiene.
Identify the product in the following reaction:
Sandmeyer with Cu₂Br₂/HBr gives bromobenzene; Mg/dry ether forms PhMgBr; H₂O protonates Grignard → benzene.
The conductivity of centimolar solution of KCl at $25^\circ$C is $0.0210\ \text{ohm}^{-1}\,\text{cm}^{-1}$ and the resistance of the cell containing the solution at $25^\circ$C is $60\ \text{ohm}$. The value of cell constant is:
Cell constant $= \kappa\cdot R = 0.0210 \times 60 = 1.26\ \text{cm}^{-1}$.
Match List-I with List-II:
| List-I | List-II |
|---|---|
| A. Coke | I. Carbon atoms are sp³ hybridised. |
| B. Diamond | II. Used as a dry lubricant. |
| C. Fullerene | III. Used as a reducing agent. |
| D. Graphite | IV. Cage-like molecules. |
Choose the correct answer from the options below:
Coke: reducing agent. Diamond: sp³. Fullerene: cage. Graphite: dry lubricant.
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