List of top Chemistry Questions asked in KEAM

Match the following columns (P) with (Q): 

 P Q
 aGrignard reagentiAICl3,
bSandmeyer's reactioniiSodium metal
cCannizzaro reactioniiiCu
dFriedel-Crafts reactionivCH3MgBr
eWurtz reactionvNaOH
The resistance of the cell containing the aqueous solution of NaCl at 20°C is 60 ohm. If the specific conductivity of this solution at 20°C is 0.04 ohm-1.cm-1,what is the cell constant in cm-1? 

Find the correct combination about the following plots (P,Q and R) for the variation rate of reaction with time. 

[Co(NH3)4(NO2)2]Cl exhibits:
In the following which can be used as an antidepressant drug ?
Following of which can be an empirical relationship between the quantity of adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. X=mass of the gas adsorbed on a mass 'm' of the adsorbent at a pressure 'P'.K and Constants,which depend on the nature of the adsorbent and the gas at a partial temperature. 

In a zero-order reaction,the reactant A disappeared with a rate of reaction k=0.04 Msec-1. The initial concentration of A is 1 M. What will be the concentration of A after 20 seconds?

The nitrogen oxide that does not contain N-N bond is:
In which of the following reactions,we will get new C-C bond?
Identify 1 and 2 in the following reactions:
In a reaction 3A → Products, the concentration of A decreases from 0.4molL-1 to 0.1molL-1 in 20 minutes at 300K. The rate of decrease in [A] during this interval (in molL-1min-1) at 300K is
Match the following:
a)Saline hydride(i)CrH
b)Electron-deficient hydride(ii)CH4
c)Electron-precise hydride(iii)BeH2
d)Electron-rich hydride(iv)B2H6
e)Metallic hydride(v)H2O

Choose the correct option:
Which one of the following is not true with regard to physisorption?
The critical temperature of some gases are: Methane 190K, ammonia 405K, carbon dioxide 304K, n-butane 425K and dihydrogen 33K. The gas that is adsorbed to the maximum extent on 1g of activated charcoal at a given temperature is
The half-life period of a first order reaction at 298K is 20 minutes. The time (in min.) required for 99.9% completion of the reaction at the same temperature, is
The vapour pressures of pure liquids X and Y at 350K are 200 mm and 300 mm of Hg respectively. Then the correct vapour pressure (in mm of Hg) of an ideal solution containing X and Y in the mole ratio 3: 2 at the same temperature is
The chemistry teacher asked the students to prepare 20% w/w solution of urea [NH2CONH2] in water. Which one of the following solution does not conform to the required composition?
The standard electrode potentials of some electrodes are given below:
Fe3+/Fe2+ 0.77V;   Br2/Br- 1.09V;    I2/I- 0.54V;    Zn2+/Zn(s) -0.76V;
Ag+/Ag(s) 0.80V;    Fe2+/Fe(s) -0.44V;    Cu2+/Cu(s) 0.34V
Predict the reaction that is not feasible:
The average oxidation number of bromine in Br3O8 is
The equilibrium constants for the following two reactions at 298k are given below:
2A ⇋ B+C; K1 =16
2B + C ⇋ 2X; K2 = 25
What is the value of k for the reaction, \(A+\frac{1}{2}B \rightleftharpoons X\) at 298K?
Some of the reactions and their equilibrium constants Kc are given. Choose the reaction which proceeds rarely at the given temperature.
Which one of the following is the correct relation between Cp and Cv for one mole of an ideal gas? (R is molar gas constant)
The standard enthalpy of formation of CH4(g), CO2(g) and H2O(I) are -75 kJ mol-1, -393 kJ mol-1 and -286 kJ mol-1 respectively. The amount of heat liberated (in kJ) when 3.2g of methane gas is burnt under standard conditions is
Which one of the following molecules contains an incomplete octet of the central atom?
A metal 'X' crystallizes in a body-centered cubic structure and its metallic radius is 346.4 pm. The length (in pm) of the unit cell is