List of top Chemistry Questions

Copper sulfate solution reacts with KCN to give:
Deep sea divers use to respire a mixture of:
What is X in the following change?
Ethylene glycol, on oxidation with periodic acid, gives:
Tautomerism is net exhibited by:
The wavelengths of two photons are 2000Å and 4000Å, respectively. What is the ratio of their energies?
The electrode potentials for \[ \text{Cu}^{2+}(aq) + e^- \rightleftharpoons \text{Cu}(s) \] \text{and} \[ \text{Cu}^{2+}(aq) + e^- \rightleftharpoons \text{Cu}(aq) \] \text{are +0.15 V and +0.50 V, respectively. The value of \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} \) will be:}
The value of \( K_c \) for the reaction: \[ A + 3B \rightleftharpoons 2C \text{ at } 400^\circ C \text{ is } 0.5. \text{ Calculate the value of } K_p. \]
Acidified potassium dichromate is treated with hydrogen sulfide. In the reaction, the oxidation number of chromium:
A Fischer projection of (2R, 3S)-2,3-butanediol is:
The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at 25°C is:
Arrange the following particles in increasing order of values of \( e/m \) ratio: electron (e), proton (p), neutron (n) and \( \alpha \)-particle (\( \alpha \)):
For the reaction \( N_2 + 3H_2 \rightarrow 2NH_3 \), if \( \frac{\Delta [NH_3]}{\Delta t} = 2 \times 10^{-4} \, \text{mol L}^{-1} \text{s}^{-1} \), then the value of \( \frac{\Delta [H_2]}{\Delta t} \) would be:
\(BrO^{3-}\) Changes into \(Br_2\) in an acidic medium of a unbalanced equation how many electron should be present on the balanced electron.
The most stable carbocation, among the following is :-
The IUPAC symbol for the element with atomic number $119$ would be :
Mendeleeff's periodic table is based on
Total number of elements in Newland's periodic table is
What happens; When dilute 'HCl' is added to granulated 'Zn' ?
\(2KHCO_3→.......+CO_2+H_2O\) find amount of gases formed (in lit.) when amount of \(KHCO_3\) is 33 gm.
2KHCO3→CO2 + H2O find amount of gases formed (in lit.). When amount of KHCO3 is 33 gm.
What is the mass of 0.5 mole of ozone molecule?
0.207 gram of organic compound gave 0.282 gram of silver bromide when heated with excess of nitric acid and silver nitrate. The percentage of bromine in the organic compound is
The thermodynamic criterion for spontaneity of a process in a system under constant volume and temperature and in the absence of any work other than expansion work (if any) is
How many moles of \(KI\) are required to produce 0.4 moles of \(K_2HgI_4\)?