List of top Chemistry Questions

The number of chiral alcohol(s) with molecular formula C4H10O is ____.
Match List I with List II. 
 List-I List-II
A.
I.Br2 in CS2
B.
II.Na2CR2O7/H2SO4
C.
III.Zn
D.
IV.CHCl3/NaOH

Choose the correct answer from the options given below:
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol –1. (Nearest Integer) [Given: R = 0.082 L atm K–1 mol–1]
Fig. 













If the initial pressure of a gas 0.03 atm, the mass of the gas absorbed per gram of the adsorbent is ____× 10–2g

Compound ‘P’ on nitration with dil. HNO3 yields two isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO3 yields a yellow compound ‘C’, a strong acid. The number of oxygen atoms is present in compound ‘C’ _____
Which of the following is most stable?
Given below are two statements :
Statement I: Maltose has two\(α-D-glucose\) units linked at \(C_1\) and \(C_4\) and is a reducing sugar.
Statement II: Maltose has two monosaccharides : 
\(α-D-glucose\) and \(β-D-glucose\) linked at \(C_1\) and \(C_6\) and it is a non-reducing sugar.
In the light of the above statements, choose the correct answer from the options given below.
If the radius of the 3rd Bohr’s orbit of hydrogen atom is r3 and the radius of 4th Bohr’s orbit is r4. Then
Which of the following structures are aromatic in nature?
Which of the following structures are aromatic in nature
0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given : Molar mass of \(Ag\) is 108 g mol–1 and that of \(Cl\) is 35.5 g mol–1

A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of 
\(\frac{[CH_3CH_2COO^−]}{[CH_3CH_2COOH] }\)
required to make buffer is _____.
Given : Ka(CH3CH2COOH) = 1.3 × 10–5

The cell potential for \(\text{Zn}|\text{Zn}^{2+}\text{(aq)}||\text{Sn}^{x+}|\text{Sn}\) is 0.801 V at 298 K.The reaction quotient for the above reaction is 10–2. The number of electrons involved in the given electrochemical cell reaction is _____. (Given: \(Eº_Zn^{2+}\)|Zn=-0.763V,Eºsnx+|sn=+0.008V and 2.303RT/F=0.06V)
The formula of the purple colour formed in Laissaigne’s test for sulphur using sodium nitroprusside is

Drugs used to bind to receptors, inhibiting its natural function and blocking a message are called:

The compound(s) that is(are) removed as slag during the extraction of copper is
(A)CaO,(B)FeO,(C)Al2O3,(D)ZnO,(E)NiO
Choose the correct answer from the options given below :

During the denaturation of proteins, which of these structures will remain intact?

Which one of the following reactions does not represent correct combination of substrateand product under the given conditions?

Most stable product of the following reaction is :
Most stable product

The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are –2220.0 kJ mol–1, –393.5 kJ mol–1 and –285.8 kJ mol–1, respectively. The magnitude of enthalpy of formation of propane (C3H8) is _____ kJ mol–1. (Nearest integer)

 In the given reaction,
The number of chiral carbon(s)
(where Et is –C2H5)
The number of chiral carbon(s) in product A is ______.

The photochemical smog does not generally contain :

The geometry around boron in the product ‘B’ formed from the following reaction is

Melamine polymer is formed by the condensation of :

The reaction of H2O2 with potassium permanganate in acidic medium leads to the formation of mainly