List of top Chemistry Questions asked in KEAM

The following concentrations were obtained for the formation of $NH_3(g)$ from $N_2(g)$ and $H_2(g)$ at equilibrium and at 500K: $[N_2] 1×10^{-2} M, [H_2] -2×10^{-2} M$ and $[NH_3]=2×10^{-2} M$. The equilibrium constant, K., for the reaction
$N_2(g)+3H_2(g)2NH; (g)$ at 500K is
A scientist wants to perform an experiment in aqueous solution in a hill station where the boiling point of water is 98.98°C. How much urea $(mol.wt \,60 g\, mol^{-1})$ is to be added by him to 2 kg of water to get the boiling point 100°C at the same place? ($K_b$ of water=0.51$K kg mol^{-1}$)
For the reaction 2P+Q ⇌ P_2Q, the rate of formation of $P_2Q is 0.24 $mol dm^{-3}s^{-1}$. Then the rates of disappearance of P and Q respectively are
Choose the correct set of reactions which follow first order kinetics:
(i) Thermal decomposition of HI on gold surface.
(ii) Thermal decomposition of $N_2O_5(g)$ at constant volume.
(iii) Hydrogenation of ethene.
(iv) Decomposition of $NH_3$ on a hot Pt surface.
(v) Thermal decomposition of $SO_2Cl_2(g)$ at constant volume.
The SI unit of molar conductivity is
Enthalpy change is always negative for which one of the following processes?
A cycle tube will burst if the volume of air inside exceeds 1L at the room temperature. If at I bar pressure the air occupies 500 mL, then up to what pressure can the tube be expanded at the same temperature?
In which one of the following, $sp^2$ hybridisation is involved in the central atom?
The ratio of the actual molar volume of a gas to the ideal molar volume is _____ of the gas.
The enthalpy change for the evaporation of a liquid at its boiling point 127°C is +40.32 $kJmol^{-1}$. What is the value of internal energy change for the above process at 127°C? (R=8.3 $JK^{-1}mol^{-1}$)
In which one of the following equilibria $Δn_g$ value is zero?
In which one of the following molecules, the central atom has expanded octet?
A cooking gas contains carbon and hydrogen only. A volume of 11.2 L of this gas is found to weigh 22 g at STP. Then the molecular formula of the gas is
Predict in which of the following, entropy decreases:
The number of electrons in an atom that may have the quantum numbers n=3 and m=+1/2 is
The gas which is the major contributor to globat warming is
The drug used to inhibit the enzymes which catalyse the degradation of noradrenaline is
The conversion of benzene diazonium chloride to bromobenzene by treating with HBr in the presence of copper powder is called
The increasing order of extent of H-bonding of the alkyl ammonium ions, RNH3+,R2NH2+, R2NH2+ in water is
Fibrous protein present in muscles is
Which one of the following statements is TRUE with regard to glucose?
Isopropylbenzene (cumene) is oxidized in the presence of air to give compound 'X which on hydrolysis in the presence of acids gives compounds 'Y' and 'Z. Compounds 'X', 'Y' and 'Z' are respectively
Compounds 'A', 'B' and 'C' have the same molecular formula C_7H_8O. Compound 'A' and 'B' liberate hydrogen gas with sodium metal. When treated with sodium hydroxide, compound 'B' alone dissolves. Compound 'C' is inert towards both sodium metal and sodium hydroxide. Compounds 'A', 'B' and 'C" are respectively
A research scholar returned to the laboratory after the lock down due to Covid-19. He kept acetone, benzaldehyde, acetaldehyde and diethyl ketone in four different bottles. The bottles contained only the label as P, Q, R and S. He forgot which bottle contained which compound. Compounds P and R only underwent iodoform test. Compound R alone gave reddish brown precipitate with Fehling's reagent. Compounds Q and R alone underwent Tollen's test. Compound S did not answer any of the above tests. Identify the compounds P, Q, R and S.
The suitable Grignard reagent used for the preparation of 2-methylpropan-1-ol using methanal is