Mix Test 1

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Mix Test 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the correct IUPAC name?

A
3-Ethyl-4,4-dimethylheptane

B
5-Ethyl-4, 4-dimethylheptane

C
4, 4-Bis(methyl)-3-ethylheptane

D
4, 4-Dimethyl-3-ethylheptane

Solution

Explanation:

While writing IUPAC name, alkyl groups are written in alphabetical order. thus lower locant 3 is assigned to ethyl. prefix di, tri or tetra are not included in alphabetical order
Question 2
1 / -0

Dihydrogen is used in fuel cells for generating electrical energy because

A
releases lesser energy per unit mass of fuel

B
does not produce any pollution

C
is rather unreactive at moderate temperatures

D
the surface tension is low

Solution

Explanation:

The fuel cell was invented in 1839 by Welsh lawyer Sir William Robert Grove. It takes in Hydrogen and Oxygen from the air and puts out electricity, heat, and water. It doesn't use fossil fuels and it doesn't produce greenhouse gases and so it should be the ideal solution to providing distributed or portable electrical power.
Question 3
1 / -0

Change in hybridisation affects the carbon’s and the organic compound’s

A
electronegativity

B
bond enthalpy

C
bond strength

D
bond length

Solution

Explanation:

in hybridization as % of 's'character increases electronegativity also increases.

more the s charater, more will be the electronegativity of that atom.

increasing order ofelectronegativity with %s character is sp (50%) > sp²(33.33%) > sp³(25%)
Question 4
1 / -0

Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?

A
Decrease

B
Increase

C
No effect

D
No regular pattern will be followed

Solution

Explanation:

Viscosity decreases as Temperature increases.
Question 5
1 / -0

Gases have much lower density than the solids and liquids because ?

A
Gases contain lower specific enthalpy than solids.

B
Distance between the molecules is small compared to solids.

C
Gases do not have intermolecular forces that attract each molecule to another.

D
Thermal energy overcomes on the attractive intermolecular forces.

Solution

Explanation:

In gases, molecules are far apart from each other, thermal energy which is a measure of freeness of motion is thus very high resulting in a very large volume for the same mass(compared to solid and liquid). Hence there density is lowest.
Question 6
1 / -0

When the soda bottle is opened, some of the dissolved carbon dioxide gas escapes because of

A
to reach a new equilibrium condition required for the higher pressure,

B
difference in solubility of carbon dioxide at different temperatures.

C
difference in solubility of carbon dioxide at different pressures.

D
some of the undissolved carbon dioxide gas in the soda bottle

Solution

Explanation:

Soda water, like other carbonated beverages, contains carbon dioxide that has dissolved under pressure. When the pressure is released by opening the soda container, the liquid cannot hold as much carbon dioxide, so the excess bubbles out of the solution. If the soda is left open, additional carbon dioxide will slowly escape into the air. Under warm conditions, the carbon dioxide leaves the solution faster.
Question 7
1 / -0

For liquid ⇌ vapour equilibrium, at a given temperature, the constant is

A
vapour pressure

B
mass of a gas

C
mass of a solvent

D
solubility

Solution

Explanation:

The vapour pressure is constant at a given temperature for liquid ⇌ vapour equilibrium. The equilibrium vapour pressure of a compound at a given temperature is an intrinsic property of the compound, meaning it does not depend on variables like volume, quantity of the compound, etc.
Question 8
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Dihydrogen under certain reaction conditions, combines with almost all elements to form binary compounds, called hydrides except with few which are given below Choose one of the options

A
noble gases,

B
p-block elements

C
alkali metals

D
transition elements

Solution

Explanation:

Noble gases are inert and have high ionisation enthalpy. Hence, they do not form any hydrides.
Question 9
1 / -0

Acid rain is :

A
Much water vapours

B
Deposition of water polluted by toxic heavy metal residues on earth

C
Deposition of organic wastes on earth

D
Deposition of acidic gaseous pollutants on earth from the atmosphere

Solution

Explanation:

The acidic gaseous pollutants like oxides of sulphur and nitrogen react with water and come down to earth in form of acid rain.
Question 10
1 / -0

Tropospheric pollution is caused by :

A
Cloud formation and turbulence

B
Dinitrogen and dioxygen gases

C
Chlorofluorocarbons (freons)

D
Oxides of sulphur, nitrogen and carbon

Solution

Explanation:

Various oxides of sulphur, nitrogen and carbon like SO₂, SO₃, NO, NO₂, CO and CO₂ cause tropospheric pollution and inflict harm to living beings.

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Re-Attempt Weekly Quiz Competition

Mix Test 1

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Mix Test 1

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Question 1

3-Ethyl-4,4-dimethylheptane

5-Ethyl-4, 4-dimethylheptane

4, 4-Bis(methyl)-3-ethylheptane

4, 4-Dimethyl-3-ethylheptane

Solution

Question 2

releases lesser energy per unit mass of fuel

does not produce any pollution

is rather unreactive at moderate temperatures

the surface tension is low

Solution

Question 3

electronegativity

bond enthalpy

bond strength

bond length

Solution

Question 4

Decrease

Increase

No effect

No regular pattern will be followed

Solution

Question 5

Gases contain lower specific enthalpy than solids.

Distance between the molecules is small compared to solids.

Gases do not have intermolecular forces that attract each molecule to another.

Thermal energy overcomes on the attractive intermolecular forces.

Solution

Question 6

to reach a new equilibrium condition required for the higher pressure,

difference in solubility of carbon dioxide at different temperatures.

difference in solubility of carbon dioxide at different pressures.

some of the undissolved carbon dioxide gas in the soda bottle

Solution

Question 7

vapour pressure

mass of a gas

mass of a solvent

solubility

Solution

Question 8

noble gases,

p-block elements

alkali metals

transition elements

Solution

Question 9

Much water vapours

Deposition of water polluted by toxic heavy metal residues on earth

Deposition of organic wastes on earth

Deposition of acidic gaseous pollutants on earth from the atmosphere

Solution

Question 10

Cloud formation and turbulence

Dinitrogen and dioxygen gases

Chlorofluorocarbons (freons)

Oxides of sulphur, nitrogen and carbon

Solution

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