List of top Chemistry Questions

Sterling silver is

Identify the statement which is not correct regarding \(CuSO_4\).

Nitrobenzene can be converted into azobenzene by reduction with

The one which is least basic is

Which of the following compounds is not coloured?

Across the lanthanide series, the basicity of the lanthanide hydroxides

The formula of ethyl carbinol is

Which of the following gives red colour in Victor Meyer’s test?

Enthalpy of a compound is equal to its

For which one of the following reactions will there be a positive \(\Delta S\)?

When p-nitrobromobenzene reacts with sodium ethoxide, the product obtained is

In the reaction sequence:
\[ \text{C}_2\text{H}_5\text{I} \xrightarrow{\text{Alcoholic KOH}} X \xrightarrow{\text{Br}_2/\text{CCl}_4} Y \xrightarrow{\text{KCN}} Z \xrightarrow{H_3O^+} A \] The product \(A\) is

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. $HCl$ solution and one formed a black precipitate with $H_{2} S$. The salt could be

Liebig? method is used for the estimation of

The vapour density of ozone is

Eutrophication causes reduction in

Which of the following statements is/are true? 1. $PH _{5}$ and $BiCl _{5}$ do not exist. 2. $pm - d \pi$ bond is present in $SO _{2}$. 3. $I _{3}{ }^{+}$has bent geometry. 4. $SeF _{4}$ and $CH _{4}$ have same shape.

In redox reaction $1\, g$-eq of reducing agent requires $Pgm$-e of oxidising agent. The value of $P$ is

Chloride ion and potassium ion are isoelectronic. Then :

Which of the following is similar to graphite

Experiment to study kinetics of the dissociation of hydrogen peroxide must be performed by group of two or three so that -

When the temperature is raised, the viscosity of liquid decreases this is because

For the reaction, $2 A(g)+B_{2}(g) \rightleftharpoons 2 A B_{2}(g)$ the equilibrium constant, $K_{p}$ at $300\, K$ is $16.0$. The value of $K_{p}$ for $A B_{2}(g) \rightleftharpoons A(g)+1 / 2 B_{2}(g)$ is

For which one of the following reactions will there be a positive $\Delta S$ ?

Which of the following is a Gattermann aldehyde synthesis?