Mix Test

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Mix Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following ions is isoelectronic with neon?

A
Br^-

B
Ba²⁺

C
P^3-

D
O²^-

Solution

Br^- (36 e^-) is isoelectronic with krypton (36 e^-).
Ba²⁺ (54 e^-) is isoelectronic with xenon (54 e^-).
P^3- (18 e^-) is isoelectronic with argon (18 e^-).
O^2- (10 e^-) is isoelectronic with neon (10 e^-).
Question 2
1 / -0

The correct IUPAC name of the compound given below is

A
3-chloropent-3-en-2-ol

B
3-chloropent-2-en-4-ol

C
3-chloro-2-hydroxypent-3-ene

D
1-chloropent-1-en-2-ol

Solution
Question 3
1 / -0

For azimuthal quantum number (l) = 2, the maximum number of electrons will be

A
2

B
6

C
10

D
14

Solution

The number of electrons in a subshell = 2(2l + 1)
For l = 3, maximum number of electrons = 2(2 x 2 + 1) = 10
Question 4
1 / -0

For which of the following species does Bohr's Theory not apply?

A
H

B
He

C
Li²⁺

D
Be³⁺

Solution

Bohr's Theory is applicable to species having one electron. It does not apply to He, which has two electrons.
Question 5
1 / -0

Which of the following elements has the highest first ionisation enthalpy?

A
Sc

B
Cr

C
Cu

D
Zn

Solution

Zinc's first ionisation energy is 906 kJ/mol. First ionisation enthalpy of Sc, Cr and Cu are 631 kJ/mol, 653 kJ/mol and 746 kJ/mol, respectively.
Zinc has very high first ionisation enthalpy because the electron has to be removed from 4s orbital of stable configuration (3d¹⁰ 4s²).
Question 6
1 / -0

Which of the following pairs represents the first row transition metal ions with equal number of unpaired electrons?

A
Ti³⁺ and Cu⁺

B
Ti²⁺ and Zn²⁺

C
V²⁺ and Co²⁺

D
Cr³⁺ and Fe³⁺

Solution

V²⁺ and Co²⁺ have equal number of unpaired electrons.
V²⁺: [Ar] 3d³; 3 unpaired electrons
Co²⁺: [Ar] 3d⁷; 3 unpaired electrons
Question 7
1 / -0

Which of the following is the correct sequence of atomic radii?

A
Al < Si < Na < Mg

B
Na < Al < Mg < Si

C
Si < Al < Mg < Na

D
Na < Mg < Al < Si

Solution

All these elements are in the same period (3^rd period). On moving across a period, the atomic radii decreases.
Hence, the correct order of atomic radii is Si < Al < Mg < Na.
Question 8
1 / -0

Which of the following substituents is m-directing?

A
-CH₃

B
-NH₂

C
-CHO

D
-OH

Solution

-CHO is m-directing due to -R effect. -CH₃, -NH₂ and -OH are o, p-directing groups.
Question 9
1 / -0

Which of the following is an amphoteric oxide?

A
CO₂

B
SiO₂

C
SiO₂

D
PbO₂

Solution

PbO₂ is an amphoteric oxide. CO₂, SiO₂ and GeO₂are acidic oxides.
Question 10
1 / -0

Which of the following orbitals has no radial nodes?

A
2s

B
2p

C
3s

D
3p

Solution

The number of radial nodes = n - l - 1
For 2s orbital, the number of radial nodes = 2 - 0 - 1 = 1
For 2p orbital, the number of radial nodes = 2 - 1 - 1 = 0
For 3s orbital, the number of radial nodes = 3 - 0 - 1 = 2
For 3p orbital, the number of radial nodes = 3 - 1 - 1 = 1
Hence, 2p has zero radial nodes.
Question 11
1 / -0

Which of the following is the correct expression of de Broglie's equation?

A
= h/2mv

B
= h/mv

C
= h²/mv

D
= (h/mv)^1/2

Solution

According to de Broglie's theory, matter (electron) has a dual character, both as a material particle and as a wave. He derived an expression for calculating wavelength associated with the motion of a particle of mass m, moving with velocity v:
= h/mv = h/p
Where, m = mass, v = velocity, h = Planck's constant and p is the linear momentum of the particle (electron).

Question 12

1 / -0

On combustion, 0.60 g of an organic compound containing C, H and O yields 0.88 g of CO₂ and 0.36 g of H₂O. If one mole of the compound weighs 60 g, then the molecular formula of the compound will be

CH₂O

C₂H₂O

C₂H₄O

C₂H₄O₂

Solution

According to the question, weight of carbon = 12 × moles of CO₂ = 12 × (0.88/44) = 0.24 g
Weight of hydrogen = 2 × moles of H₂O = 2 × (0.36/18) = 0.04 g
And weight of oxygen = 0.60 – (0.24 + 0.04) = 0.32 g

Element	C	H	O
Weight	0.24	0.04	0.32
Mole ratio	0.24/12 = 0.02	0.04/1 = 0.04	0.32/ 16 = 0.02

Simple ratio = 1 : 2 : 1
Empirical formula = CH₂O
Empirical formula weight = 30
Molecular weight = n x Empirical formula weight
60 = n x 30
n = 2
Molecular formula = (Empirical formula)_n = (CH₂O)₂ = C₂H₄O₂

Question 13
1 / -0

Which of the following is the correct order of second ionisation enthalpy?

A
N > Al > Si > P

B
N > P > Al > Si

C
Al > P > Si > N

D
Si > P > Al > N

Solution

Second ionisation enthalpies of N, P, Al and Si are 2856 kJ/mol, 1903 kJ/mol, 1816 kJ/mol and 1577 kJ/mol, respectively.
Hence, the correct order of second ionisation enthalpy is N > P > Al > Si.
Question 14
1 / -0

Which of the following groups shows isoelectronic species?

A
N₂, O₂, NO⁺

B
CO, N₂, O₂

C
CO, N₂, CN^-

D
F₂, NO⁺, CN^-

Solution

Isoelectronic species have the same number of electrons.
CO, N₂, and CN^-,each has 14 electrons.
Question 15
1 / -0

According to kinetic theory of gases, a gas molecule in an ideal gas travels in a ______ between two successive collisions.

A
circular path

B
straight line path

C
wavy path

D
brownian path

Solution

According to kinetic theory of gases, between two successive collisions, a gas molecule in an ideal gas travels in a straight line path.

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Re-Attempt Weekly Quiz Competition

Mix Test - 8

Result

Mix Test - 8

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SHARING IS CARING

Question 1

Br-

Ba2+

P3-

O2-

Solution

Question 2

3-chloropent-3-en-2-ol

3-chloropent-2-en-4-ol

3-chloro-2-hydroxypent-3-ene

1-chloropent-1-en-2-ol

Solution

Question 3

2

6

10

14

Solution

Question 4

H

He

Li2+

Be3+

Solution

Question 5

Sc

Cr

Cu

Zn

Solution

Question 6

Ti3+ and Cu+

Ti2+ and Zn2+

V2+ and Co2+

Cr3+ and Fe3+

Solution

Question 7

Al < Si < Na < Mg

Na < Al < Mg < Si

Si < Al < Mg < Na

Na < Mg < Al < Si

Solution

Question 8

-CH3

-NH2

-CHO

-OH

Solution

Question 9

CO2

SiO2

SiO2

PbO2

Solution

Question 10

2s

2p

3s

3p

Solution

Question 11

= h/2mv

= h/mv

= h2/mv

= (h/mv)1/2

Solution

Question 12

CH2O

C2H2O

C2H4O

C2H4O2

Solution

Br^-

Ba²⁺

P^3-

O²^-

Li²⁺

Be³⁺

Ti³⁺ and Cu⁺

Ti²⁺ and Zn²⁺

V²⁺ and Co²⁺

Cr³⁺ and Fe³⁺

-CH₃

-NH₂

CO₂

SiO₂

SiO₂

PbO₂

= h²/mv

= (h/mv)^1/2

CH₂O

C₂H₂O

C₂H₄O

C₂H₄O₂

N₂, O₂, NO⁺

CO, N₂, O₂

CO, N₂, CN^-

F₂, NO⁺, CN^-