List of top Questions asked in KEAM- 2019

A spherically uniform planet of mass \( 8 \times 10^{24} \) kg and of radius \( 6 \times 10^6 \) m is orbiting around the Sun. The escape velocity for the planet is close to (Take \( G = 6 \times 10^{-11} \text{ N m}^2\text{kg}^{-2} \)) (A) 11.2 km/s

The standard of length is maintained by a 1 meter long bar made up of a material having coefficient of linear expansion \( \alpha = 10^{-5}\,\text{°C}^{-1} \). If the length of the bar were to be preserved to an accuracy of 1 part per million, what would be the maximum allowed temperature variation?

In the Hofmann rearrangement of primary amides having optically active group with S-configuration, the product amine has

Benzonitrile can be prepared from benzaldehyde on treatment with

The compound which does not lead to benzoic acid by oxidation with KMnO$_4$ is

The following reaction is named as

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

The strongest base among the following is

When C$_6$H$_5$COCOC$_6$H$_5$ is reduced with LiAlH$_4$, the product formed has __________ stereoisomers.

Sulfonation of benzene with excess sulfuric acid provides

Arylbromides are not good candidates for

__________________ is a potent vasodilator.

An invert sugar is

Cyclohexylamine and aniline can be distinguished by

Propylene on treatment with HBr/H$_2$O$_2$ provides

The correct IUPAC name for methylisopropylacetylene is

The compounds pyridine and planar cyclooctatetraene are __________________, respectively

In a lead-acid battery, if 1 A current is passed to charge the battery for 1 h, what is the amount of PbSO$_4$ converted to PbO$_2$? (Given data: 1 F = 96500 C mol$^{-1}$)

For a first order reaction, A(g) $\rightarrow$ B(g) at 35 $^\circ$C, the volume of "A" left in the reaction vessel at various times are given below. [Given data: $\log(5/4) = 0.0969$]

What is the value of rate constant?

The equilibrium constant for the reaction, N$_2$(g) + 3H$_2$ $\rightleftharpoons$ 2NH$_3$(g) and 2N$_2$(g) + 6H$_2$ $\rightleftharpoons$ 4NH$_3$(g) are $K_1$ and $K_2$, respectively. The relationship between $K_1$ and $K_2$ is

At a certain temperature, 2 moles of CO and 4 moles of Cl$_2$ gases were reacted to form COCl$_2$ in a 10 L vessel. At equilibrium if one mole of CO is present then equilibrium constant for the reaction is

\( E_{\text{cell}} \) of the following cell is
\( \text{Pt(s)} \mid \text{H}_2\text{(g), 1 bar} \mid \text{H}^+ \text{ (1 M)} \mid\mid \text{H}^+ \text{ (0.1 M)} \mid \text{H}_2\text{(g), 1 bar} \mid \text{Pt(s)} \)

A fuel cell operates at constant current, with H$_2$ fuel (1 bar) and O$_2$ oxidant (1 bar). The electrolyte used is 0.001 M HCl and the product(s) of the reaction are confined inside the fuel cell. Which of the following is true about the electrolyte?

The Henry's law constant for O\(_2\) dissolved in water is \( 4.34 \times 10^4\text{ atm} \) at certain temperature. If the partial pressure of O\(_2\) in a gas mixture that is in equilibrium with water is \( 0.434\text{ atm} \), what is the mole fraction of O\(_2\) in the solution?