Chemistry Test

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Chemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The Henry’s law constant for the solubility of N2 gas in water at 298 K is 1.0 × 10^5 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 from air dissolved in 10 moles of water at 298 K and 5 atm pressure is

A

4.0 × 10^−4

B

5.0 × 10^−4

C

4.0 × 10^−5

D

4.0 × 10^−6
Question 2
1 / -0

For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation log k = -(2000) 1/T + 6.0. The pre-exponential factor A and the activation energy Ea, respectively, are

A

1.0 × 10^6 s^−1 and 38.3 kJmol^−1

B

6.0 s^−1 and 16.6 kJmol^−1

C

1.0 × 10^6 s^−1 and 16.6 kJmol^−1

D

1.0 × 10^6 s^−1 and 9.2 kJmol^−1
Question 3
1 / -0

The hydrogen-like species Li^2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom. Energy of the state S1 in units of the hydrogen atom ground state energy is

A

2.25

B

0.75

C

1.50

D

4.50
Question 4
1 / -0

In the following carbocation. H/CH3 that is most likely to migrate to the positively charged carbon is

A

H at C-2

B

H at C-4

C

CH3 at C-4

D

CH3 at C-2
Question 5
1 / -0

p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with afew drops of aqueous solution of Y to yield blue coloration due to the formation of methylene blue. Treatment of theaqueous solution of Y with the reagent potassium hexacyanoferrate (II) leads to the formation of an intense blueprecipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y withthe solution of potassium hexacyanoferrate (III) leads to a brown coloration due to the formation of Z. The compound X is

A

Na2 S

B

NaCl

C

Na2 SO4

D

NaNO3
Question 6
1 / -0

The dissociation constant of a substituted benzoic acid at 25 deg C is 1.0 × 10^−4. The pH of a 0.01 M solution of its sodium salt is

A

8

B

9

C

7

D

10
Question 7
1 / -0

Silver (atomic weight = 108 g mol^−1) has a density of 10.5 g cm^−3. The number of silver atoms on a surface of area 10^−12 m^2 can be expressed in scientific notation as y × 10^x. The value of x is

A

7

B

8

C

9

D

6
Question 8
1 / -0

Find each of the compounds given in the figure with the reaction(s), that they can undergo given in options :-

A

All of these

B

Esterification with acetic anhydride

C

Dehydrogenation

D

Nucleophilic substitution
Question 9
1 / -0

In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ K^−1, the numerical value for the enthalpy of combustion of the gas in kJmol^−1 is

A

9

B

8

C

7

D

10
Question 10
1 / -0

The correct statement(s) regarding defects in solids is(are)

A

Frenkel defect is a dislocation defect

B

Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion

C

Schottky defects have no effect on the physical properties of solids

D

All of these

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Re-Attempt Weekly Quiz Competition

Chemistry Test - 5

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Chemistry Test - 5

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SHARING IS CARING

Question 1

4.0 × 10^−4

5.0 × 10^−4

4.0 × 10^−5

4.0 × 10^−6

Question 2

1.0 × 10^6 s^−1 and 38.3 kJmol^−1

6.0 s^−1 and 16.6 kJmol^−1

1.0 × 10^6 s^−1 and 16.6 kJmol^−1

1.0 × 10^6 s^−1 and 9.2 kJmol^−1

Question 3

2.25

0.75

1.50

4.50

Question 4

H at C-2

H at C-4

CH3 at C-4

CH3 at C-2

Question 5

Na2 S

NaCl

Na2 SO4

NaNO3

Question 6

8

9

7

10

Question 7

7

8

9

6

Question 8

All of these

Esterification with acetic anhydride

Dehydrogenation

Nucleophilic substitution

Question 9

9

8

7

10

Question 10

Frenkel defect is a dislocation defect

Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion

Schottky defects have no effect on the physical properties of solids

All of these

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My Perfomance

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