Chemistry Test

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Chemistry Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which among the following combination is present in the higher amount in hard water?

A
Calcium and magnesium

B
Calcium and sodium

C
Sodium and manganese

D
Sodium and magnesium
Solution
- Calcium and magnesium are major components of hard water.
- Hard water is formed when water percolates through limestone or gypsum which is high in calcium and magnesium content.
- Soaps do not act in hard water due to the presence of these salts but detergent is capable to give results in hard water.
- Water softening systems work by reducing the concentrations of minerals from the water.
Question 2
1 / -0

Where is the world’s largest oil refinery operated by Reliance Petroleum located?

A
Jamnagar

B
Koyali

C
Visakhapatnam

D
Mangalore

Solution

Jamnagar refinery is the world's largest oil refinery with an aggregate capacity of 1.24 bpd. The refinery complex is located at Jamnagar in Gujarat, India. It is owned and operated by Reliance Industries.
Question 3
1 / -0

In $32$ minutes, $75 %$ of a first order reaction was found to be complete. When would $50 %$ of the same reaction be complete?

A
$4$ minutes

B
$8$ minutes

C
$16$ minutes

D
$24$ minutes

Solution

For a first order reaction-
$T_{75 %} = 2 T_{50 %}$
where $T_{75 %}$ is completion time for $75 %$ and $T_{50 %}$ is completion time for $50 %$
$\Rightarrow 32$ minutes $= 2 T_{50 %}$
$\Rightarrow 16$ minutes $= T_{50 %}$
Question 4
1 / -0

_____________ is the process of conversion of a solid directly into vapour.

A
Humidity

B
Sublimation

C
Fusion

D
Hoarfrost.

Solution

Sublimation is conversion of a substance from the solid to the gaseous state without its becoming liquid.
An example is the vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.
Hoarfrost is formed by direct condensation of water vapour to ice at temperatures below freezing and occurs when air is brought to its frost point by cooling.
Question 5
1 / -0

What is the atomic number of Iron?

A
21

B
22

C
24

D
26

Solution

The atomic number of Iron is 26
Question 6
1 / -0

A catalyst _______.

A
increases the free energy change of the reaction

B
decreases the free energy change of the reaction

C
neither increase nor decrease the free energy of the reaction

D
may increase or decrease the depending upon the nature of the catalyst

Solution

dG = Gproducts – G Reactants Hence , it does not change in the presence of a catalyst
Question 7
1 / -0

The boiling point of water is _______ at 1 atmospheric pressure that is, at sea level.

A
80 °C

B
100 °C.

C
160 °C

D
200 °C

Solution

The boiling point of water is 100 °C at 1 atmospheric pressure that is, at sea level.The boiling point of water depends on the atmospheric pressure, which changes according to elevation.
The boiling point of water depends on the purity of the water, atmospheric pressure. Water that contains impurities (such as salted water) boils at a higher temperature than pure water.
Question 8
1 / -0

Mp denotes the mass of a proton and M_n that of a neutron. A given nucleus of binding energy B contains Z protons and N neutrons. The mass M (N, Z) of the nucleus is given by?

A
M (N, Z) = NM_n + ZM_p - Bc²

B
M (N, Z) = NM_n + ZM_p + Bc²

C
M (N, Z) = NM_n + ZM_p - B/c²

D
M (N, Z) = NM_n + ZM_p + B/c²

Solution

Sol: $B E=\Delta m c^{2}$ formula
$\therefore B e=\left[N M_{n}+Z M_{p}-M(A, Z)\right] C^{2}$
$\frac{B E}{C^{2}}=(A-Z) M_{n}+Z M_{p}-M(A, Z)$
$\because N=A-Z$
$\therefore M(A, Z)=Z M_{p}+(A-Z) M_{n}-\frac{B E}{C^{2}}$
$M(A, Z)=Z M_{p}+N M_{n}-\frac{B}{C^{2}}$
$N=A-Z$
Here, $M_{p}:$ Mass of proton
$M_{n}:$ Mass of electron
Question 9
1 / -0

Which of the following orbitals has the lowest screening effect?

A
s

B
p

C
d

D
f

Solution

For the same shell, screening effect decreases in the order: s>p>d>f. Thus, for n=4, 4s orbital has maximum screening effect and 4f orbital has the lowest screening effect.
Question 10
1 / -0

An atom of an element with mass number 23 and atomic number 11 will have .

A
11 neutrons, 12 protons and 11 electrons

B
11 protons, 12 neutrons and 11 electrons

C
11 protons, 12 electrons and 11 neutrons

D
23 protons and 11 electrons

Solution

11 protons, 12 neutrons and 11 electrons

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Chemistry Test - 1

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Chemistry Test - 1

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Question 1

Calcium and magnesium

Calcium and sodium

Sodium and manganese

Sodium and magnesium

Solution

Question 2

Jamnagar

Koyali

Visakhapatnam

Mangalore

Solution

Question 3

4 minutes

8 minutes

16 minutes

24 minutes

Solution

Question 4

Humidity

Sublimation

Fusion

Hoarfrost.

Solution

Question 5

21

22

24

26

Solution

Question 6

increases the free energy change of the reaction

decreases the free energy change of the reaction

neither increase nor decrease the free energy of the reaction

may increase or decrease the depending upon the nature of the catalyst

Solution

Question 7

80 °C

100 °C.

160 °C

200 °C

Solution

Question 8

M (N, Z) = NMn + ZMp - Bc2

M (N, Z) = NMn + ZMp + Bc2

M (N, Z) = NMn + ZMp - B/c2

M (N, Z) = NMn + ZMp + B/c2

Solution

Question 9

s

p

d

f

Solution

Question 10

11 neutrons, 12 protons and 11 electrons

11 protons, 12 neutrons and 11 electrons

11 protons, 12 electrons and 11 neutrons

23 protons and 11 electrons

Solution

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$4$ minutes

$8$ minutes

$16$ minutes

$24$ minutes

M (N, Z) = NM_n + ZM_p - Bc²

M (N, Z) = NM_n + ZM_p + Bc²

M (N, Z) = NM_n + ZM_p - B/c²

M (N, Z) = NM_n + ZM_p + B/c²