List of top Chemistry Questions asked in KEAM

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

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

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

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

$1.5\, g$ 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

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

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

Sphalerite is concentrated by

Amine that cannot be prepared by Gabriel- phthalimide synthesis is

Excess nitrate in drinking water can cause

Choose the reaction with negative $\Delta$S value

A lone pair of electrons in an atom implies

$20.0 \,kg$ 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

Hard acids prefer to combine with

Which one of the following has the highest molar conductivity?

The increasing order of the density of alkali metals is

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

Which of the following is the least basic amine?

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 among the following statements are correct? (i) Carbon monoxide is neutral whereas $ S0_3 $ is acidic (ii) Potassium oxide is basic whereas nitrous oxide is acidic (iii) Aluminium and zinc oxides are amphoteric (iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic (v) Carbon dioxide is netural whereas sulphur dioxide is amphoteric

The compound that undergoes dehydration very easily is

For a first order reaction the rate constant is 6.909 $min^{-1}$. The time taken for 75% conversion in minutes is