List of top Questions asked in KEAM

Let $X = \{a_1, a_2, a_3, \ldots, a_n\}$ be a set consisting of $n$ elements. The relation $R = \{(a_1,a_1),(a_2,a_2),(a_3,a_3),\ldots,(a_n,a_n)\}$ on the set $X$ is:

Pyridinium chlorochromate is a complex of

IUPAC name of $CH_3-CH(OH)-CH_2-CH(OH)-CH(C_2H_5)-CH_2CH_3$ is

The increasing order of boiling point of the following amines is

Which of the following amines does not form carbylamine?

An organic compound with molecular formula $C_5H_{10}O$ does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogen sulphite and gives positive iodoform test. On vigorous oxidation, it gives ethanoic and propanoic acids. The compound is:

The reagent used for the conversion of decanol into decanoic acid is

In Swarts reaction, Freon-12 is manufactured from

Which of the following are carcinogenic hydrocarbons? (i) 1,2-Benzanthracene
(ii) Pent-1-yne
(iii) 1,2-Benzpyrene
(iv) Cyclohexane
(v) 3-Methylcholanthrene

In chemotherapy, the ligand used to remove the excess of copper is

IUPAC name of $(CH_3)_3C-CH_2Br$ is

In Carius method, $0.40\,g$ of an organic compound gave $0.188\,g$ of $AgBr$. The percentage of bromine in the compound is (Atomic mass of Ag = 108 g mol$^{-1}$ and Br = 80 g mol$^{-1}$)

Let $f(x)=10x^2+ax,\; x\in \mathbb{R}$ be such that $a^2-400<0$. Let $g(x)=f(x)+f'(x)+f''(x)$. Then $g(x)$ is:

Which of the following statements are true about electronegativity? (i) Electronegativity generally increases across a period and decreases down a group.
(ii) The electronegativity of a given element is constant.
(iii) The electronegativity values decrease with the increase in atomic radii.
(iv) Electronegativity is directly related to the metallic property of the elements.
(v) Electronegativity is inversely related to the non-metallic property of the elements.

Some transition metal ions given below contain spin only magnetic moment (BM). Which of the following is not correctly matched?

What is the mass of ethanoic acid required to prepare $0.5\,m$ solution containing $100\,g$ of water? (Molar mass of ethanoic acid = $60\,g\,mol^{-1}$)

The enthalpy of combustion of benzene, graphite and dihydrogen at $298\,K$ are $-3260$, $-390$ and $-290\,kJ\,mol^{-1}$ respectively. Enthalpy of formation of benzene is:

Which of the following reactions are complex reactions? (i) Oxidation of ethane
(ii) Thermal decomposition of HI on gold surface
(iii) Saponification of methyl acetate
(iv) Nitration of phenol
(v) Decomposition of $NH_3$ on hot Pt surface

Which of the following transition metal has more than one metallic structure at normal temperature?

In a first order reaction, $N_2O_5(g) \rightarrow 2NO_2(g) + \frac{1}{2}O_2(g)$, the initial concentration of $N_2O_5$ was $1.6 \times 10^{-3} mol\,lit^{-1}$ at $300\,K$. The concentration of $N_2O_5$ after 23 minutes was $0.8 \times 10^{-3} mol\,lit^{-1}$. ($\log 2 = 0.3010$). Find the rate constant.

What is the emf of the cell at $298\,K$ in which the following reaction takes place? \[ Ni(s) + 2Ag^+(0.002M) \rightarrow Ni^{2+}(0.04M) + 2Ag(s) \] ($E^\circ_{cell} = 1.05V$)

Which of the following metals are normally used in the preparation of dihydrogen in the laboratory?

The concentration of hydrogen ions in a hydrochloric acid solution is $3 \times 10^{-3}M$. Its pH value is about ($\log 3 = 0.4771$)

Choose the correct pair Bond
(a) C-H (i) 464
(b) O-H (ii) 569
(c) F-H (iii) 293
(d) Si-H (iv) 414

For the equilibrium, $X_2(g) + O_2(g) \rightleftharpoons 2XO(g)$, the equilibrium concentrations of $X_2(g)$ and $O_2(g)$ are $4 \times 10^{-3}M$ and $8 \times 10^{-3}M$ respectively. What is the equilibrium concentration of $XO(g)$? ($K_c = 0.5$)