List of top Chemistry Questions asked in KEAM

The basicity of pyrophosphorous acid is

Among the following, which species represents a pseudohalide?

An alkene $ {{C}_{4}}{{H}_{8}} $ , was treated with ozone and then with zinc and water to give acetone and formaldehyde. The alkene is:

Sphalerite is concentrated by

IUPAC name of $ C{{H}_{3}}CH=\underset{\begin{align} & | \\ & C{{H}_{2}} \\ & | \\ & C{{H}_{3}} \\ \end{align}}{\mathop{C}}\,C{{H}_{3}} $

$1.5\, g$ of a non-volatile, non-electrolyte is dissolved in $50 \,g$ benzene $(K_b\, =\, 2.5\, K kg \,mol^{-1}$ ). The elevation of the boiling point of the solution is $0.75\, K$. The molecular weight of the solute in $g$ $mol^{-1}$ is

A gas mixture contains 50% helium and 50% methane by volume. What is the percent by weight of methane in the mixture ?

For the reaction $ 2{{N}_{2}}{{O}_{5}}(g)\xrightarrow[{}]{{}}4N{{O}_{2}}(g)+{{O}_{2}}(g) $ if the concentration of $ N{{O}_{2}} $ increases by $ 5.2\times {{10}^{-3}} $ M in 100 s then the rate of the reaction is:

Ammonia will not form complex with

Reaction of diborane with ammonia gives initially

A binary solid has a primitive cubical structure with $B^-$ ions constituting the lattice points and $A^+$ ions occupying $25\%$ of its tetrahedral holes. The molecular formula of the crystal is

Complete combustion of 0.858 g of compound $ X $ gives 2.63 g of $ C{{O}_{2}} $ and 1.28 g of $ {{H}_{2}}O $ . The lowest molecular weight which $ X $ can have, is:

Among the following, the optically active compound is

Choose the reaction with negative $\Delta$S value

Amine that cannot be prepared by Gabriel- phthalimide synthesis is

Excess nitrate in drinking water can cause

A lone pair of electrons in an atom implies

Hard acids prefer to combine with

$20.0 \,kg$ of $N_2(g)$ and $3.0\, kg$ of $H_2(g)$ are mixed to produce $NH_3(g)$. The amount of $NH_3(g)$ formed is

Which one of the following has the highest molar conductivity?

The increasing order of the density of alkali metals is

Freon-12 is manufactured from tetrachloromethane by

The neopentyl halide in ethanol yields alkenes by $E1$ mechanism due to

Consider the following compounds 1. $(NH_4)_2Cr_2O_7$ 2. $NH_4NO_2$ 3. $NH_4 VO_3$ 4. $NH_4 NO_3$ Which compound(s) yield nitrogen gas upon heating?

Which of the following is the least basic amine?