List of top Chemistry Questions

\[\text{Phenol} \xrightarrow{\text{(i) NaOH, (ii) CO}_2, \, \text{140°C}} \text{A} \xrightarrow{\text{H}^+/\text{H}_2\text{O}}\text{B}\xrightarrow{\text{Ac}_2\text{O}} \text{C}\]
In the above reaction, end product 'C' is

The product (P) is

Which of the following is least soluble in water?

The compressibility of a gas is less than unity at STP; therefore

A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives

Plaster of Paris is represented as

What are the hydrolysis products of sucrose?

The distinction between primary, secondary and tertiary amines can be done experimentally by using

What will be the boiling point of $ 30 \,g $ benzene containing $ 0.75\, g $ of benzoic acid which undergoes $ 75\% $ dimerization? Boiling point of pure benzene $ = 80.1^{\circ}C $ and $ K_b = 2.53 \,K mol^{-1}\, kg $

Under what condition, will $ x/m $ value be equal to pressure of the gas on the surface of the absorbent?

Let the energy of an $ n^{th} $ orbit of $ H $ atom be $ -21.76 \times 10^{19}/n^2\, J $ . What will be the longest wavelength of energy required to remove an electron from the third orbit?

Hoffmann's bromamide reaction is used to

What should be possible $ d $-orbital energy levels of $ Ni $ in $ [Ni(CN)_4]^{2-} $ ?

Why is $ F_2 $ the strongest oxidizing agent (among halogens) although electron affinity of $ Cl_2 $ is higher than $ F_2 $ ?

What is the correct order of bond strength for $ NO, NO^+ $ and $ NO^- $ ?

What will be the $ pH $ at which precipitation of $ Zn(OH)_2 $ will take place from a solution containing $ 0.3 \,M \,Zn^{2+} $ ion? $ K_{sp} $ of $ Zn(OH)_2 = 1.2 \times 10^{-12} $

There are four conformational isomers of $ n $ -butane. Eclipsed, Fully eclipsed, Gauche, Staggered Arrange these isomers of $ n $ -butane in increasing order of energy.

According to the expression $ \Delta G^{\circ} = -nFE^{\circ} $ , the cell reaction is spontaneous when (Notations and symbols carry their usual meanings)

Compounds $ A $ and $ C $ in the following reaction are $ CH_3CHO {->[(i) CH_3MgBr][(ii)H_2O]} (A) {->[H_2SO_4, \Delta ]} (B) $ $ {->[{\text{Hydroboration oxidation}}]} (C) $

A common observation seen in $ Fe_3O_4 $ is that it is ferrimagnetic at room temperature but at $ 850 \,K $ it becomes

If $3.01 \times 10^{20}$ molecules are removed from $98 \, mg$ of $H_2SO_4$, then number of moles of $H_2SO_4$ left are

Which of the following reactions is appropriate for converting acetamide to methanamine?

Mechanism of a hypothetical reaction \(X_2 + Y_2→ 2XY\) is given below :
(i) \(X_2→ X + X\) (fast)
(ii) \(X + Y_2⇋ XY + Y\) (slow)
(iii) \(X + Y → XY\) (fast)
The overall order of the reaction will be

Extraction of gold and silver involves leaching with CN^– ion. Silver is later recovered by

The IUPAC name of the compound