List of top Chemistry Questions

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
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.
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

Which of the following is most stable?
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 correct order of increasing ionic radii is

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

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
The number of chiral alcohol(s) with molecular formula C4H10O is ____.
Which of the following structures are aromatic in nature?
Which of the following structures are aromatic in nature
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]

Consider the following metal complexes:
[Co(NH3)6]3+
[CoCl(NH3)5]2+
[Co(CN)6]3–
[Co(NH3)5(H2O)]3+
The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is _______ B.M. (Nearest integer)

Which of the following sets of quantum numbers is not allowed?

The number of N atoms in \(681\ g\) of \(C_7H_5N_3O_6\) is \(x × 10^{21}\). The value of \(x\) is ______ . (\(N_A\) = \(6.02 × 10^{23}\ mol^{–1}\)) (Nearest Integer)
While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25g of the compound neutralized 2.5mL of 2M H2SO4. The percentage of nitrogen present in organic compound is ________

The photochemical smog does not generally contain :

Among the following species
N2,N2+,N2−,N22−,O2,O2+,O2−,O22−
the number of species showing diamagnetism is ________.

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

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

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

The number of sp3 hybridised carbons in an acyclic neutral compound with molecular formula C4H5N is ________.

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)

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

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

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is