IIT-JEE Practise paper-8 [Test]

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Muggu

IIT-JEE Practise paper-8

A test by Muggu.

Test Questions

Question

What is the effect of the reduction of the volume of the system for the equilibrium $2C_{(g)} + O_{2(g)} \leftrightharpoons 2CO(g) ?$

Answers

Correct	Answer Text
	The equilibrium will be shifted to the right by the increased pressure caused by the reduction in volume.
	The equilibrium will be shifted to the left by the increased pressure caused by the increase in volume.
	The equilibrium will be shifted to the right by the decreased pressure caused by the reduction in volume.
	The equilibrium will be shifted to the left by the increased pressure caused by the reduction in volume.

Question

Consider the reaction;
$2CO_{(g)} + O_2 \leftrightharpoons 2CO_{2(G)} + heat$
Which of the following is incorrect?

Answers

Correct	Answer Text
	The addition of and removal of at constant volume will shift the equilibrium to the right.
	The addition of and increase in temperature at constant volume not determinable.
	The addition of a catalyst and decrease in temperature will shift the equilibrium to the left.
	The addition of and decrease in volume will shift the equilibrium to the right.

Question

The equilibrium constants for the reaction $X_2 \leftrightharpoons 2X$ at 300 K and 600 K are $10^{-8}$ and $10^{-3}$ respectively the reaction is;

Answers

Correct	Answer Text
	Exothermic
	Thermo neutral
	Endothermic
	Slow

Question

At constant pressure, the presence of argon at equilibrium of :
$N_2 + 3H_2 \leftrightharpoons 2NH_3$

Answers

Correct	Answer Text
	Increase the formation of
	Decrease the formation of both and
	Decrease the formation of
	Reduce the formation of

Question

Answer the following 4 questions given below.

There are set of 4 quantum numbers:

1. Principal quantum number is denoted by n. The values of n ranges from 1 to n. It gives information about the size and energy level of major energy shells. For one electron species, the mathematical expression of energy is
$E_n = \frac{-2 \pi^2 me^4z^2}{n^2h^2}$
For multielectron atoms, it determines only the probable energy of the electron.

2. Azimuthal or angular quantum number is denoted by l. Its values ranges from 0 to (n–1) for s,p,d,f sub- shells respectively. It gives information about shape, energy level of subshell and orbital angular momentum of the electron,
$\bigg[\sqrt l(l+1) \frac{h}{2 \pi} \bigg]$
3. Magnetic quantum number is denoted by m. The values of m ranges from –l to +l. It give information about possible number of orientations of sub-shells.

4. Spin quantum number is denoted by s. The values of s are 1/2 and –1/2. It signifies the direction of spin of electrons in an orbital.

The angular momentum l of an electron in a Bohr's orbital is given as;

Answers

Correct	Answer Text
	$L =\frac{h}{4\pi}$
	$L =\frac{nh}{2\pi}$
	$L =\sqrt {l(l+1)} \frac{h}{2\pi}$
	$L =\sqrt {l(l+2)} \frac{h}{2\pi}$

Question

The quantum numbers +1/2 and -1/2 for the electron spin represents;

Answers

Correct	Answer Text
	rotation of the electron in clockwise and anti-
	magnetic moment of electron pointing up and
	two quantum mechanical spin states which have
	rotation of the electron in anti-clockwise

Question

Which of the following statement is wrong for an electron that has n = 4 and m = 2?

Answers

Correct	Answer Text
	The electron may be in a p-orbital
	The electron must have the spin quantum
	The electron is in the fourth principal electronic
	The electron may be in a d-orbital

Question

The maximum value of l for an electron in fifth energy level is;

Answers

Correct	Answer Text
	4
	3
	5
	2

Question

In each of the following 2 question, a statement of Assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Of the statement, mark the correct answer as;

Assertion: The kinetic of the reaction -
$mA + nB + pC \rightarrow m'X+n'Y+p'Z$ obeys the rate of expression as $\frac{dX}{dt} =k[A]^m[B]^n$

Reason: The rate of the reaction does not depend upon the concentrations of C.

Answers

Correct	Answer Text
	A is false but R is true
	A is true but R is false
	both A and R are true but R is not the correct explanation of A
	both A and R are true and R is the correct explanation of A

Question

Assertion: $Cu^{2+}$ is a colured ion.

Reason: Every ion with unpaired electron is colured.

Answers

Correct	Answer Text
	A is false but R is true
	A is true but R is false
	both A and R are true and R is the correct explanation of A
	both A and R are true but R is not the correct explanation of A