Question 1

Which of the following compound has maximum boiling point&#8230;&#8230;..&#10;A)n-hexane&#10;B)n-pentane&#10;C)2, 2-dimethyl propane&#10;D)2-methyl butane

Accepted Answer

n-Hexane has the maximum boiling point among the options given because it has the longest carbon chain, which leads to stronger van der Waals forces compared to the other compounds listed. These forces increase with the size of the molecule, thus requiring more energy (higher temperature) to overcome them during the phase transition from liquid to gas.

Question 2

Knocking sound occurs in engine when fuel&#8230;&#8230;&#8230;.&#10;A)Ignites slowly&#10;B)Ignites rapidly&#10;C)Contains water&#10;D)Is mixed with machine oil

Accepted Answer

Knocking in engines occurs when the fuel-air mixture ignites prematurely or too rapidly, causing a sharp spike in cylinder pressure. This rapid combustion results in the characteristic knocking or pinging sound.

Question 3

Petroleum is mainly a mixture of&#8230;&#8230;&#8230;..&#10;A)Alkanes&#10;B)Cyclohexane&#10;C)Benzenoid hydrocarbons&#10;D)Alkenes

Accepted Answer

Petroleum is primarily composed of alkanes, which are saturated hydrocarbons with single bonds between carbon atoms.

Question 4

Which of the following has maximum boiling point&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)iso-octane&#10;B)n-octane&#10;C)2, 2, 3, 3-tetramethyl butane&#10;D)n-butane

Accepted Answer

n-Octane has the highest boiling point among the given options because it has the longest continuous chain of carbon atoms, which allows for more extensive van der Waals forces (London dispersion forces) compared to the more branched isomers, leading to a higher boiling point.

Question 5

Aqueous solution of the following compound on electrolysis gives ethane&#8230;&#8230;&#8230;.&#10;A)Acetic acid&#10;B)Acetamide&#10;C)Potassium acetate&#10;D)Ethyl acetate

Accepted Answer

Potassium acetate (C) on electrolysis undergoes decarboxylation, leading to the formation of ethane.

Question 6

Which of the following does not decolourise bromine solution in carbon disulphide&#8230;&#8230;&#8230;..&#10;A)Acetylene&#10;B)Propene&#10;C)Ethane&#10;D)Propyne

Accepted Answer

Ethane does not decolourise bromine solution in carbon disulphide because it is a saturated hydrocarbon (alkane) and does not have a double or triple bond to react with bromine, unlike acetylene, propene, and propyne which are unsaturated hydrocarbons and can add bromine across their multiple bonds, leading to decolourisation.

Question 7

Anhydrous sodium acetate on heating with sodalime gives&#8230;&#8230;&#8230;&#8230;.&#10;A)Acetic acid&#10;B)Methane&#10;C)Calcium acetate&#10;D)Ethane

Accepted Answer

Anhydrous sodium acetate when heated with sodalime (a mixture of sodium hydroxide and calcium oxide) undergoes a decarboxylation reaction, where the carboxyl group is removed as carbon dioxide, leaving behind methane (CH4) as the product.

Question 8

Water gas is……….. A)CO + CO₂ B)CO + N₂ C)CO + H₂ D)CO + N₂ + H₂

Accepted Answer

Water gas is a mixture of carbon monoxide (CO) and hydrogen (H₂), typically produced by passing steam over hot carbon.

Question 9

A sample of gasoline contains 81% iso-octane and 19% nheptane. Its octane number will be&#8230;&#8230;..&#10;A)19&#10;B)81&#10;C)100&#10;D)62

Accepted Answer

The octane number of a fuel is a measure of its resistance to knocking or pinging during combustion, with higher numbers indicating greater resistance. Iso-octane, with a chemical structure that resists knocking, has an octane rating of 100, serving as the standard for high octane rating, while n-heptane, which knocks easily, has an octane rating of 0. The octane number of a mixture can be approximated by the volume percentage of iso-octane in the mixture if the other component is n-heptane. Therefore, a mixture of 81% iso-octane and 19% n-heptane would have an octane number approximately equal to the percentage of iso-octane, which is 81.

Question 10

The natural petroleum contains&#8230;&#8230;&#8230;&#8230;.&#10;A)Saturated hydrocarbons&#10;B)Cyclic saturated hydrocarbons&#10;C)Compounds of sulphur&#10;D)All of these

Accepted Answer

The natural petroleum contains saturated hydrocarbons, cyclic saturated hydrocarbons, and compounds of sulphur.

Question 11

The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as&#8230;&#8230;.&#10;A)Wurtz reaction&#10;B)Sabatier-Senderen's reaction&#10;C)Kolbe's synthesis&#10;D)Grignard reaction

Accepted Answer

The answer of The preparation of ethane by electrolysis of...

Question 12

As the number of carbon atoms in a chain increases the boiling point of alkanes&#8230;&#8230;&#8230;.&#10;A)Increases&#10;B)Decreases&#10;C)Remains same&#10;D)May increase or decrease

Accepted Answer

The answer of As the number of carbon atoms in...

Question 13

In the fractional distillation of crude petroleum&#8230;&#8230;&#8230;..&#10;A)Petrol condenses at the bottom of the column&#10;B)The gases condense at the top of the column&#10;C)High boiling constituents condense at the bottom of the column&#10;D)High boiling constituents condense at the top of the column

Accepted Answer

The answer of In the fractional distillation of crude petroleum&#8230;&#8230;&#8230;..&#10;A)Petrol...

Question 14

Which of the following is not an endothermic reaction&#8230;&#8230;&#8230;&#8230;&#10;A)Dehydrogenation&#10;B)Ethane to ethene&#10;C)Combustion of propane&#10;D)Change of chlorine molecule into chlorine atoms

Accepted Answer

The answer of Which of the following is not an...

Question 15

Gasoline is the name of &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Crude oil&#10;B)The gaseous constituents of petroleum&#10;C)The mixture of uncondensed gases produced in the distillation of crude oil&#10;D)The mixture of the residue and gas oil obtained in the distillation of crude oil

Accepted Answer

The answer of Gasoline is the name of &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Crude oil&#10;B)The...

Question 16

In the process of cracking&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Organic compounds decompose into their constituent elements&#10;B)Hydrocarbons decompose into carbon and hydrogen&#10;C)High molecular weight organic compounds decompose to give low molecular weight organic compounds&#10;D)Hydrocarbons yield alkyl radicals and hydrogen

Accepted Answer

The answer of In the process of cracking&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Organic compounds decompose...

Question 17

Octane number has 0 value for&#8230;&#8230;&#8230;.&#10;A)iso-octane&#10;B)n-hexane&#10;C)n-heptane&#10;D)iso-heptane

Accepted Answer

The answer of Octane number has 0 value for&#8230;&#8230;&#8230;.&#10;A)iso-octane&#10;B)n-hexane&#10;C)n-heptane&#10;D)iso-heptane...

Question 18

Dry distillation of sodium propanoate with sodalime gives &#8230;&#8230;&#8230;&#8230;..&#10;A)Propane&#10;B)Propene&#10;C)Ethane&#10;D)Ethene

Accepted Answer

The answer of Dry distillation of sodium propanoate with sodalime...

Question 19

A mixture of propene and methane is obtained by the cracking of&#8230;&#8230;&#8230;&#8230;..&#10;A)1-butene&#10;B)2-butene&#10;C)n-butane&#10;D)Isobutane

Accepted Answer

The answer of A mixture of propene and methane is...

Question 20

Which of the following fractions of petroleum refining contains kerosene ? (Boiling ranges in o C are given below)&#10;A)40 - 80&#10;B)80 - 200&#10;C)200 - 300&#10;D)Above 300

Accepted Answer

The answer of Which of the following fractions of petroleum...

Question 21

On mixing tetraethyl lead to gasoline available at petrol pumps&#8230;&#8230;&#8230;&#8230;..&#10;A)Calorific value of the fuel increases&#10;B)Odour diminishes&#10;C)Less smoke is obtained on combustion&#10;D)Antiknock property of fuel increases

Accepted Answer

The answer of On mixing tetraethyl lead to gasoline available...

Question 22

A liquid hydrocarbon can be converted to gaseous hydrocarbon by&#8230;&#8230;&#8230;&#8230;..&#10;A)Cracking&#10;B)Hydrolysis&#10;C)Oxidation&#10;D)Distillation under reduced pressure

Accepted Answer

The answer of A liquid hydrocarbon can be converted to...

Question 23

The tetrahedral nature of carbon was first given by&#8230;&#8230;&#8230;&#8230;.&#10;A)Kekule&#10;B)Le Bell and Van't Hoff&#10;C)Pauling&#10;D)Armstrong and Bayer

Accepted Answer

The answer of The tetrahedral nature of carbon was first...

Question 24

Formation of alkane by the action of Zn on alkyl halide is called&#10;A)Frankland's reaction&#10;B)Wurtz reaction&#10;C)Cannizzaro reaction&#10;D)Kolbe's reaction

Accepted Answer

The answer of Formation of alkane by the action of...

Question 25

Name the hydrocarbon that is a liquid at STP&#8230;&#8230;&#8230;.&#10;A)Ethane&#10;B)Propane&#10;C)n-butane&#10;D)n-pentane

Accepted Answer

The answer of Name the hydrocarbon that is a liquid...

Deck 3: Petroleum and Hydrocarbons