IIT-JEE Practise paper-9 [Test]

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Muggu

IIT-JEE Practise paper-9

A test by Muggu.

Test Questions

Question

Supposing the energy of fourth shell for hydrogen atom is –50 a.u. (arbitrary unit). What would be its ionization potential;

Answers

Correct	Answer Text
	20.8
	15.4
	50
	800

Question

K.E. of the electron is $4.55*10^{-25}J$ . Its de-Broglie wave length is;

Answers

Correct	Answer Text
	$8300 \overset{0}{A}$
	$7285 \overset{0}{A}$
	$4700 \overset{0}{A}$
	$7400 \overset{0}{A}$

Question

Two system
$PCl_5 \leftrightharpoons PCl_3 + Cl_2$ and
$COCl_2 \leftrightharpoons CO + Cl_2$ are simultaneously in a vessel of constant volume. If some CO is introduced into the vessel then at the new equilibrium the concentration of:

Answers

Correct	Answer Text
	remains unchanged
	is less
	is greater
	is greater

Question

The balanced chemical equation –
$2CO + O_2 \leftrightharpoons 2 CO_2$
Signifies which one of the following:

Answers

Correct	Answer Text
	One can add to vessel only 2 moles of CO for each mole added.
	When these react, CO reacts with in a 2:1 mole ratio.
	No mater how much of these tow reactants are added to a vessel, only one mole of will react 2 moles of CO.
	When two mole of CO and one mole of are placed in a vessel, they will react to give 2 mole of .

Question

Answer the following 5 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.

Which of the following statement is /are wrong?

Answers

Correct	Answer Text
	If the value of l = 0, electron distribution is
	The shape of the orbital is given by magnetic
	Angular moment of 1s, 2s and 3s electrons are
	In an atom, all electrons travel with the same

Question

If the value of principal quantum number is 3, the total possible values for magnetic quantum number will be;

Answers

Correct	Answer Text
	1
	9
	4
	12

Question

For n = 4,

Answers

Correct	Answer Text
	the highest value of m is +3.
	the total number of possible values of m are 7.
	the highest value of l is 4
	the total possible values of l are 3.

Question

Magnetic quantum number (m) determines;

Answers

Correct	Answer Text
	energy of electron in an applied and
	All of the above
	z-component of orbital angular momentum
	orientation of orbital

Question

Principal quantum number of an atom is related to the;

Answers

Correct	Answer Text
	orientation of the orbital in space.
	spin angular momentum.
	orbital angular momentum.
	size of the orbital.

Question

In each of the following 1 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 paramagnetism of Cu + ion is zero.
Reason: Paramagnetism is given by the relation
$\mu =2 \sqrt{S(S+1)}$
magnetons where S is the total spin.

Answers

Correct	Answer Text
	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
	A is true but R is false
	A is false but R is true