List of top Chemistry Questions

Consider the following phenols as shown in the figure. The decreasing order of acidity of the above phenols is: 

Aniline reacts with phosgene and KOH to form: 

Which of the following can possibly be used as analgesic without causing addiction and modification?
Which of the following ions can be separated by aq. NH\(_4\)OH in presence of NH\(_4\)Cl?
3.92 g of ferrous ammonium sulphate reacts completely with 50 ml of \(\frac{N}{10}\) KMnO\(_4\) solution. The percentage purity of the sample is:
Which among the following is not an antibiotic?
The reaction \[ \mathrm{CH_3-CH=CH_2 \xrightarrow[\text{H}^+]{CO+H_2O} CH_3-CH(COOH)-CH_3} \] is known as:
The ionization constant of phenol is higher than that of ethanol because:
Which one of the following monomers gives the polymer neoprene on polymerization?
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?
The correct order of magnetic moments (spin only values in B.M.) is: (Atomic nos.: Mn = 25, Fe = 26, Co = 27)
Which of the following halogens exhibit only one oxidation state in its compounds?
Which forms coloured salts:
The number of double bonds in gammaxene is:
The isoelectric point of a colloidally dispersed material is the pH value at which:
Two substances R and S decompose in solution independently, both following first order kinetics. The rate constant of R is twice that of S. Initially 0.5 millimoles of R and 0.25 of S. The molarities of R and S will be equal at the end of time equal to:
The reduction of peroxodisulphate ion by I\(^{-}\) ion is expressed by \(\text{S}_2\text{O}_8^{2-} + 3\text{I}^- \rightarrow 2\text{SO}_4^{2-} + \text{I}_3^-\). If rate of disappearance of I\(^{-}\) is \(9/2 \times 10^{-3}\,\text{mol L}^{-1}\text{s}^{-1}\), what is the rate of formation of \(2\text{SO}_4^{2-}\) during same time?
An organic compound A (C\(_4\)H\(_9\)Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative. Then A is:
When rain is accompanied by a thunderstorm, the collected rain water will have a pH value:
The correct order of increasing C–O bond length in CO, CO\(_3^{2-}\), CO\(_2\) is:
Identify the correct order of solubility of Na\(_2\)S, CuS and ZnS in aqueous medium:
An elemental crystal has a density of \(8570\,\text{kg m}^{-3}\). The packing efficiency is 0.68. The closest distance of approach between neighbouring atoms is \(2.86\,\text{\AA}\). What is the mass of one atom approximately?
Which of the following compounds has wrong IUPAC name?
The compound which gives the most stable carbocation on dehydration is:
Which of the following among alkali metal is most reactive?