List of top Chemistry Questions

In which of the following, drug class is correctly matched with the criteria of drug classification?
In which of the following chain termination step is absent?
The process of converting a precipitate into colloidal solution is known as
The pH of 0.01M BOH solution is 10. What is its degree of dissociation? (Given $ K_b $ of BOH is $ 1 \times 10^{-6} $)
Match the reactions in List-I with the features of their products in List-II and choose the correct option 
 List-I List-II 
(P)(-)-1-Bromo-2-ethylpentane SN2 Reaction
(single enantiomer) 		(1)  Inversion of configuration
(Q) (-)-2-Bromopentane SN2 Reaction
(single enantiomer) 		(2) Retention of configuration
(R) (-)-3- Bromo-3-methylhexane SN1 Reaction
(single enantiometer) 		(3) Mixture of enantiomers 
(S) single enantiomer SN1 Reaction
(single enantiometer)		(4) Mixture of structural isomers
  (5) Mixture of diastereomers
Which of the following amine cannot be prepared by the Gabriel phthalimide synthesis method?

The preferred reagent for the following conversion is $CH_3CH_2COOH \rightarrow CH_3CH_2COCl$

Which element of group 14 decomposes steam to form dioxide and dihydrogen gas?
The standard enthalpy of atomization of ethane according to the equation $ \text{C}_2\text{H}_6(g) \rightarrow 2\text{C}(g) + 6\text{H}(g) $ is $ 622 \, \text{kJ mol}^{-1} $. If standard mean C-H bond dissociation enthalpy is $ 99 \, \text{kJ mol}^{-1} $, the standard mean dissociation enthalpy of C-C bond (in kJ mol$ ^{-1} $) is
What are the formal charges on terminal oxygens of the ozone molecule?
An oxide of chlorine with water gives the strongest acid. The ratio of chlorine and oxygen in its formula is:
Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
Total number of angular nodes of orbitals associated with third shell $ (n=3) $ of an atom is:

The metal and metalloid in the $5^{th}$ period of the long form of the periodic table are respectively

Number of electrophiles from the following: CH₄, CO₂, NH₃, H₂O, SO₃, H⁺, BF₃

Consider the disproportionation reaction $ 2 \, \text{Cu}^{+} \rightleftharpoons \text{Cu}^{2+} + \text{Cu}(s) $. At equilibrium $[ \text{Cu}^{+} ] / [ \text{Cu}^{2+} ] = 10^4 $. If $ E_{\text{Cu}^{+}/\text{Cu}} = 0.15 \, \text{V} $, then $ E_{\text{Cu}^{2+}/\text{Cu}} $ (in V) is:

Match the following:
List - I (Enzyme reaction)   List - II (Enzyme used)
 

List - I (Enzyme reaction)List - II (Enzyme used)
A. SucroseI. Zymase
B. ProteinsII. Pepsin
C. StarchIII. Invertase
D. GlucoseIV. Diastase
Observe the two statements
Assertion (A): Benzyl chloride undergoes S$_{N}$1 reaction readily while chloro benzene does not.
Reason (R): C-Cl bond in chlorobenzene has partial double bond due to resonance.
The correct answer is
An organic compound with molecular formula C$_6$H$_6$O gives an orange-red precipitate with 2,4-dinitrophenylhydrazine. It gives negative Tollens' test. The product of it with hydroxylamine is
The correct statement with respect to D-glucose (x) and D-Fructose (y) is D-glucose (x) and D-fructose (y) are related as follows.
Two statements are given below
Statement (I): C-O bond length in methanol is 136 pm and in phenol 142 pm.
Statement (II): The C-O-H bond angle in methanol and phenol is almost same.

Better results for the preparation of ethers X and Y can be obtained from reactant pairs respectively

Among Mn, Tc, Re, and Bh, which are having the (n-1)d$^5$ ns$^2$ electronic configuration?
The packing efficiency of BCC unit cell is equal to
Among the following, the method used for removal of temporary hardness of water is