Chemistry Test

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Chemistry Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

For a hypothetical reaction 2A + 3B→2C, the rate law expression is = dx/dt k[A] [B]². The order of the reaction is

A
1

B
2

C
2.5

D
3

Solution

In chemical kinetics, the order of reaction with respect to a given substance (such as reactant, catalyst or product) is defined as the index, or exponent, to which its concentration term in the rate equation is raised. For the given expression, according to rate law, order of reaction is: 2 + 1 = 3.
Question 2
4 / -1

Ratio between r.m.s. velocity of hydrogen at 50 K and that of oxygen at 800 K is

A
4

B
2

C
1

D
1/4

Solution

\(\frac{u_{1}}{u_{2}}=\sqrt{\frac{3 R T_{1}}{M_{1}} \times \frac{M_{2}}{3 R T_{2}}}\)
Question 3
4 / -1

The oxidation potential values of A, B, C and D are -0.03 V, +0.108 V, -0.07 V and +0.1 V, respectively. The non-spontaneous cell reaction takes place between

A
A (anode) and B (cathode)

B
B (anode) and D (cathode)

C
D (anode) and A (cathode)

D
B (anode) and C (cathode)

Solution

E_cell = E_Reduction (cathode) - E_Reduction (anode)

Or

E_cell = E_Oxidation (anode) - E_Oxidation (cathode)

A cell functions when Ecell is positive, i.e. when E_Reduction(cathode) > E_Reduction(anode) and E_Oxidation (anode) > E_Oxidation (cathode).

Since the order of oxidation potentials is: B > D > A > C.

Therefore, the cell will not function when A is at anode and B is at cathode.
Question 4
4 / -1

The partial pressure of hydrogen in a flask containing 2 g of H₂ and 32 g of SO₂ is

A
1/16 of total pressure

B
1/2 of total pressure

C
2/3 of total pressure

D
1/8 of total pressure

Solution

The partial pressure of A in a mixture of A and other gases is the total pressure multiplied by the mole fraction of A.

In the present case,

Mole fraction of hydrogen =1/(1+(1/2)) = 2/3

The partial pressure of Hydrogen = 2/3 of total pressure
Question 5
4 / -1

Which one of the following is not included in internal energy?

A
Vibrational energy

B
Energy arising out of coriolis force

C
Electronic energy

D
Energy arising out of gravitational pull

Solution

It is the energy needed to create the system, but excludes the energy to displace the system's surroundings, any energy associated with a move as a whole, or due to external force fields. So it does not include energy arising out of gravitational pull.
Question 6
4 / -1

The oxidation state of sulphur in Na₂S4O₆ is

A
3/2

B
1/2

C
5/2

D
2/5

Solution

The oxidation state of sulphur in Na₂S₄O₆ is 5/2.The difference in the oxidation numbers of the two

types of sulphur atoms in \(\mathrm{Na}_{2} \mathrm{S}_{4} \mathrm{O}_{6}\) is:

Oxidation number of sulphur atom involved in coordinate bond formation is (+5) and that of middle sulphur atom is zero. Hence the difference in oxidation number of two types of sulphur aton will be \((+5) .]\)
Question 7
4 / -1

What is the number of atoms in 100 amu of He? (Atomic weight of He is 4 u)

A
25

B
100

C
50

D
125

Solution

Mass of 1 atom of helium = 4 amu

So, in 100 amu, the number of helium atoms = 100/4 = 25
Question 8
4 / -1

Which of the following compounds has a tetrahedral structure?

A
NH₃

B
SiCl₄

C
N₂O

D
None of these

Solution

SiCl4 has 4 bond pairs and no lone pair, so it has a tetrahedral structure.
Question 9
4 / -1

Van't Hoff factor of Ca(NO₃)₂ is

A
one

B
two

C
three

D
four

Solution

The number of free ions produced in this case is 3. Hence, van't Hoff factor (i) = 3.

Ca(NO₃)₂ → Ca⁺² + 2NO₃^-1

Van't Hoff factor (i) = 3
Question 10
4 / -1

For As₂S₃ sol, the maximum coagulation power is of

A
cl^-

B
SO₄^-2

C
PO₄^-3

D
Al⁺³

Solution

As₂S₃ is a negatively charged sol.

Hence, the cation of the electrolyte will be the active ion and option (4) is correct.

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Chemistry Test - 7

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Chemistry Test - 7

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Question 1

1

2

2.5

3

Solution

Question 2

4

2

1

1/4

Solution

Question 3

A (anode) and B (cathode)

B (anode) and D (cathode)

D (anode) and A (cathode)

B (anode) and C (cathode)

Solution

Question 4

1/16 of total pressure

1/2 of total pressure

2/3 of total pressure

1/8 of total pressure

Solution

Question 5

Vibrational energy

Energy arising out of coriolis force

Electronic energy

Energy arising out of gravitational pull

Solution

Question 6

3/2

1/2

5/2

2/5

Solution

Question 7

25

100

50

125

Solution

Question 8

NH3

SiCl4

N2O

None of these

Solution

Question 9

one

two

three

four

Solution

Question 10

cl-

SO4-2

PO4-3

Al+3

Solution

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NH₃

SiCl₄

N₂O

cl^-

SO₄^-2

PO₄^-3

Al⁺³