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questions
List of practice Questions
Which one of the following is not not an ore of iron?
KEAM - 2022
KEAM
Chemistry
Metallurgy
Both Cr
2+
and Mn
3+
have d
4
configuration. Which one of the following is true?
KEAM - 2022
KEAM
Chemistry
coordination compounds
Which of the following set of transition metals have high volatility?
KEAM - 2022
KEAM
Chemistry
d -and f -Block Elements
Which of the following compounds is used as refrigerant?
KEAM - 2022
KEAM
Chemistry
p -Block Elements
Which one of the following processes does not produce dinitrogen?
KEAM - 2022
KEAM
Chemistry
Chemical Kinetics
The metal which dissolves in liquid ammonia to give a blue-black solution due to formation of solvated electron is
KEAM - 2022
KEAM
Chemistry
p -Block Elements
Match the following:
a)
Saline hydride
(i)
CrH
b)
Electron-deficient hydride
(ii)
CH
4
c)
Electron-precise hydride
(iii)
BeH
2
d)
Electron-rich hydride
(iv)
B
2
H
6
e)
Metallic hydride
(v)
H
2
O
Choose the correct option:
KEAM - 2022
KEAM
Chemistry
Chemical bonding and molecular structure
Which one of the following is not true with regard to physisorption?
KEAM - 2022
KEAM
Chemistry
Surface Chemistry
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
KEAM - 2022
KEAM
Chemistry
States of matter
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
KEAM - 2022
KEAM
Chemistry
Chemical Kinetics
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
KEAM - 2022
KEAM
Chemistry
Solutions
The chemistry teacher asked the students to prepare 20% w/w solution of urea [NH
2
CONH
2
] in water. Which one of the following solution does not conform to the required composition?
KEAM - 2022
KEAM
Chemistry
Solutions
The standard electrode potentials of some electrodes are given below:
Fe
3+
/Fe
2+
0.77V; Br
2
/Br
-
1.09V; I
2
/I
-
0.54V; Zn
2+
/Zn(s) -0.76V;
Ag
+
/Ag(s) 0.80V; Fe
2+
/Fe(s) -0.44V; Cu
2+
/Cu(s) 0.34V
Predict the reaction that is not feasible:
KEAM - 2022
KEAM
Chemistry
Electrochemistry
The average oxidation number of bromine in Br
3
O
8
is
KEAM - 2022
KEAM
Chemistry
Oxidation Number
The equilibrium constants for the following two reactions at 298k are given below:
2A ⇋ B+C; K
1
=16
2B + C ⇋ 2X; K
2
= 25
What is the value of k for the reaction,
\(A+\frac{1}{2}B \rightleftharpoons X\)
at 298K?
KEAM - 2022
KEAM
Chemistry
Law Of Chemical Equilibrium And Equilibrium Constant
Some of the reactions and their equilibrium constants K
c
are given. Choose the reaction which proceeds rarely at the given temperature.
KEAM - 2022
KEAM
Chemistry
Law Of Chemical Equilibrium And Equilibrium Constant
Which one of the following is the correct relation between C
p
and C
v
for one mole of an ideal gas? (R is molar gas constant)
KEAM - 2022
KEAM
Chemistry
Thermodynamics
The standard enthalpy of formation of CH
4
(g), CO
2
(g) and H
2
O(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
KEAM - 2022
KEAM
Chemistry
Enthalpy change
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
KEAM - 2022
KEAM
Chemistry
The solid state
The dipole-dipole interaction energy between rotation polar molecules is proportional to___, where 'r' is the distance between polar molecules.
KEAM - 2022
KEAM
Chemistry
intermolecular forces
Which one of the following reactions involves change from sp
2
to sp
3
hybridisation of the central atom?
KEAM - 2022
KEAM
Chemistry
Hybridisation
Which one of the following molecules contains an incomplete octet of the central atom?
KEAM - 2022
KEAM
Chemistry
Chemical bonding and molecular structure
A fast moving particle of mass 6.63×10
-28
g can be located with an accuracy of 1A. The uncertainty in its velocity (in ms
-1
) is about (h=6.63×10
-34
Js)
KEAM - 2022
KEAM
Chemistry
Quantum Mechanical Model of Atom
From the following, choose the correct structures of chloroxylenol and terpineol, which are the constituents of "Dettol"
KEAM - 2022
KEAM
Chemistry
Alcohols, Phenols and Ethers
A particle of mass 6.6×10
-31
kg is moving with a velocity of 1×10
7
ms
-1
. The de Broglie wavelength (in A) associated with the particle, is (h=6.6×10
-34
Js)
KEAM - 2022
KEAM
Chemistry
Structure of atom
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