Chemistry Test

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Chemistry Test - 5

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Question 1
1 / -0

The amount of heat required to raise the temperature of 1 kg of water through 1^oC is called?

A
specific heat at constant volume

B
specific heat at constant pressure

C
kilocalorie

D
None of these

Solution

The small calorie or gram calorie (symbol: cal) is the approximate amount of energy needed to raise the temperature of one gram of water by one degree Celsius, thus 1 kilo calorie is the amount of heat required to raise the temperature of 1 kg of water through 1^oC
Question 2
1 / -0

Modulus of elasticity is defined as the ratio of?

A
Shear stress to shear strain

B
Linear stress to linear strain

C
Linear stress to lateral strain

D
Lateral stress to linear strain

Solution

Modulus of elasticity is defined as the ratio of Linear stress to linear strain
Question 3
1 / -0

Bond order increases and magnetic behaviour changes in which of the following ionisation processes?

A
N² → N₂⁺

B
C² → C₂⁺

C
NO → NO⁺

D
O₂ → O₂⁺

Solution

A) Going from $N_{2}$ to $N_{2}^{+},$ bond order decreases from 3 to 2.5.
B) Going from $C_{2}$ to $C_{2}^{+},$ bond order decreases from 2 to 1.5.
C) Going from $N O$ to $N O^{+},$ bond order increases from 2.5 to 3 , and the magnetic behavior changes from paramagnetic to dimagnetic.
D) Going from $O_{2}$ to $O_{2}^{+},$ bond order increases from 2 to $2.5,$ but magnetic behavior does not
changes. Both of these species are paramagnetic.
Question 4
1 / -0

For the reaction: H₂(g) + I₂(g) ⇌ 2HI(g), the equilibrium constants expressed in terms of concentration K_c and partial pressure K_p are related as?

A
K_p = K_c(RT)²

B
K_p = K_c(RT)^-2

C
K_p = K_c

D
K_c = K_p(RT)

Solution

Correct Answer : K_p = K_c
Question 5
1 / -0

The nuclear particle having no mass and no charge, but only spin is?

A
proton

B
neutrino

C
meson

D
electron

Solution

Neutrinos do not carry electric charge, and have mass quite small, though non-zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
Question 6
1 / -0

The maximum number of electrons that can be in a subshell is-

A
$4 l + 2$

B
$4 l - 2$

C
$2 n^{2}$

D
$2 l + 1$

Solution

The maximum number of electrons that can be in a subshell is $2 (2 l + 1)$ that is same as $4 l + 2$ .
Question 7
1 / -0

A mixture of water and alcohol can be separated by?

A
Filtration

B
Evaporation

C
Distillation

D
Decantation

Solution

To separate a mixture of alcohol (ethanol) and water, you can use a process known as fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points.
Question 8
1 / -0

If steel is heated bright red hot and is then cooled slowly, the process is called?

A
Annealing

B
Tempering

C
Smelting

D
Quenching

Solution

Annealing, in metallurgy and materials science, is a heat treatment that alters the physical and sometimes chemical properties of a material to increase its ductility and reduce its hardness, making it more workable.
Question 9
1 / -0

What is the relation between K_p and K_c in the following reaction?

N₂(g) + 3H₂(g) = 2NH₃(g).

A
K_p = K_c

B
K_p = K_c - RT

C
K_p = K_c/(RT)²

D
K_p = K_c/(RT)^-2

Solution

We have Kc = [NH3]2 / [N2] [H2]3

Kp = P2NH3 / PN2 P3H2

Now we know the relationship between Kp and Kc.

Kp = Kc(RT)Δn

Δn = 2-(1+3) = -2

Kp = Kc/ (RT)2
Question 10
1 / -0

A reaction was found to be in second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled with everything else kept the same, the rate of reaction will?

A
be doubled

B
remain unchanged

C
be tripled

D
increase by a factor of 4

Solution

According to the given question the reaction follows second order kinetics and there is only one reactant that is carbon monoxide, let us assume it as 'A:
we know that for second order reaction, $r=k[A]^{2}$
Thus any change in the concentration of carbon dioxide will have it's effect on the rate of the
reaction.

Hence when the concentration of carbon monoxide is doubled, the rate of the reaction will be
increased by four times as the reaction follows second order kinetics. $\therefore r=k[2 A]^{2}$
$\therefore r=4 k A^{2}$
which is four times it's initial rate.
Therefore the correct answer is option (D).

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Chemistry Test - 5

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Chemistry Test - 5

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SHARING IS CARING

Question 1

specific heat at constant volume

specific heat at constant pressure

kilocalorie

None of these

Solution

Question 2

Shear stress to shear strain

Linear stress to linear strain

Linear stress to lateral strain

Lateral stress to linear strain

Solution

Question 3

N2 → N2+

C2 → C2+

NO → NO+

O2 → O2+

Solution

Question 4

Kp = Kc(RT)2

Kp = Kc(RT)-2

Kp = Kc

Kc = Kp(RT)

Solution

Question 5

proton

neutrino

meson

electron

Solution

Question 6

4l+2

4l–2

2n2

2l+1

Solution

Question 7

Filtration

Evaporation

Distillation

Decantation

Solution

Question 8

Annealing

Tempering

Smelting

Quenching

Solution

Question 9

Kp = Kc

Kp = Kc - RT

Kp = Kc/(RT)2

Kp = Kc/(RT)-2

Solution

Question 10

be doubled

remain unchanged

be tripled

increase by a factor of 4

Solution

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N² → N₂⁺

C² → C₂⁺

NO → NO⁺

O₂ → O₂⁺

K_p = K_c(RT)²

K_p = K_c(RT)^-2

K_p = K_c

K_c = K_p(RT)

$4 l + 2$

$4 l - 2$

$2 n^{2}$

$2 l + 1$

K_p = K_c

K_p = K_c - RT

K_p = K_c/(RT)²

K_p = K_c/(RT)^-2