Chemistry Test 158

Result

Chemistry Test 158

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Weekly Quiz Competition

Question 1
4 / -1

The energy released in an atom bomb explosion is mainly due to

A
Release of neutron

B
Release of electron

C
Greater mass of products than initial material

D
Lesser mass of products than initial material

Solution

Large energy released in atomic bomb explosion is mainly due to products having lesser mass than initial substance.

The mass difference is converted to energy and is responsible for release of large amount of energy.
Question 2
4 / -1

Acetaldoxime reacts with P₂O₅ to produce

A
Ethyl cyanide

B
Propyl cyanide

C
Methyl cyanide

D
None of the above

Solution

CH3CHO + H2NOH CH3CH=N-OH

Dehydration of CH3CH=N-OH in presence of P2O5gives CH3-CN
Question 3
4 / -1

Which one of the following elements shows the maximum number of different oxidation states in its compounds?

A
Eu

B
La

C
Cd

D
Am

Solution

Am shows +2, +3, +4, +5, +6, +7 oxidation states.
Question 4
4 / -1

An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to

A
increased ionic mobility of ions

B
100 percent electrolyte ionisation with natural dilution

C
increase in both ion numbers and ionic mobility

D
A rise in ion counts

Solution

Λeq=k×1000/Normality

On dilution, the number of charge carriers per m3 decreases but the volume increases. Consequently, the ionic mobility increases which increase equivalent conductance.
Question 5
4 / -1

Which of the following bond has the highest bond energy?

A
Te-Te

B
Se-Se

C
O-O

D
S-S

Solution

Due to lower size and less electron-electron repulsion, S-S have highest bond energy.
Question 6
4 / -1

The volume of 20 volume H₂O₂ required to get 5 litres of O₂ at STP is

A
250 ml

B
125 ml

C
100 ml

D
50 ml

Solution
Question 7
4 / -1

The electrons, identified by quantum numbers n and l (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as

A
(iv) < (ii) < (iii) < (i)

B
(ii) < (iv) < (i) < (iii)

C
(i) < (iii) < (ii) < (iv)

D
(iii) < (i) < (iv) < (ii)

Solution
Question 8
4 / -1

According to the Periodic Law of elements, the variation in properties of elements is related to their

A
nuclear masses

B
atomic numbers

C
nuclear neutron-proton number ratios

D
atomic masses

Solution

According to modern periodic law, the properties of the elements are repeated after certain regular intervals when these elements are arranged in order of their increasing atomic numbers.
Question 9
4 / -1

Which of the following pairs of ions are isoelectronic and isostructural?

A

B

C

D

Solution
Question 10
4 / -1

As the temperature is raised from 20C to 40C, the average kinetic energy of neon atoms changes by a factor of which of the following?

A
313 / 293

B

C

D
2

Solution