Question 1

Which statement is not true concerning alkanes&#8230;&#8230;&#8230;..&#10;A)Large number alkanes are soluble in water&#10;B)All alkanes have a lower density than water&#10;C)At room temperature some alkanes are liquids, some solids and some gases&#10;D)All alkanes burn

Accepted Answer

Alkanes are hydrophobic, meaning they do not mix well with water. Their solubility in water is very low, making statement A incorrect.

Question 2

Fischer Tropsch process is used for the manufacture of&#8230;&#8230;&#8230;&#8230;&#10;A)Synthetic petrol&#10;B)Thermosetting plastics&#10;C)Ethanol&#10;D)Benzene

Accepted Answer

The Fischer-Tropsch process is a set of chemical reactions that converts a mixture of carbon monoxide and hydrogen into liquid hydrocarbons. These reactions occur in the presence of metal catalysts, typically at temperatures of 150–300 °C (302–572 °F) and pressures of one to several tens of atmospheres. The process is a key component of gas to liquids technology and is used to produce synthetic petroleum for use as a fuel or lubricant.

Question 3

A fuel contains 25 % n-heptane and 75 % iso-octane. Its octane number is&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)50&#10;B)75&#10;C)100&#10;D)25

Accepted Answer

Octane number of a fuel is the percentage of iso-octane in a mixture of n-heptane and iso-octane having the same knocking characteristics as the fuel. Here, the fuel contains 25% n-heptane and 75% iso-octane. Therefore, its octane number is 75.

Question 4

Sodium ethoxide is a specific reagent for&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Dehydration&#10;B)Dehydrogenation&#10;C)Dehydrohalogenation&#10;D)Dehalogenation

Accepted Answer

Sodium ethoxide is specifically used for dehydrohalogenation reactions, where it acts as a strong base to remove a hydrogen halide from an alkyl halide, leading to the formation of an alkene.

Question 5

Which of the following has highest percentage of hydrogen……….. A)CH₄ B)C₂H₄ C)C₆H₆ D)C₂H₂

Accepted Answer

The molecular formulas given are in a subscript notation that might not be directly clear. However, interpreting the question as looking for the compound with the highest percentage of hydrogen by mass, option A (CH4) has the highest percentage of hydrogen. This is because in methane (CH4), there are 4 hydrogen atoms bonded to a single carbon atom, making the proportion of hydrogen by mass higher than in the other compounds listed, which have more carbon or other elements, thereby reducing the percentage of hydrogen by mass.

Question 6

What is the molecular formula of the alkane, the 5.6 litre of which weight 11 g at STP………. A)C₆ H14 B)C₄H₁₀ C)C₃H₈ D)C₂H₆

Accepted Answer

The answer of What is the molecular formula of the...

Question 7

The order of appearance of the following with rising temperature during the refining of crude oil is&#8230;..&#8230;......&#10;A)Kerosene oil, gasoline, diesel&#10;B)Diesel, gasoline, kerosene oil&#10;C)Gasoline, diesel, kerosene oil&#10;D)Gasoline, kerosene oil, diesel

Accepted Answer

During the refining of crude oil, the order of appearance with rising temperature is gasoline, kerosene oil, and then diesel. This is because gasoline has the lowest boiling point, followed by kerosene, and then diesel, which has the highest boiling point among the three.

Question 8

When sodium propionate is heated with soda lime, the main product is&#8230;&#8230;&#8230;&#8230;..&#10;A)Ethane&#10;B)Methane&#10;C)Propane&#10;D)Butane

Accepted Answer

When sodium propionate is heated with soda lime (a mixture of sodium hydroxide and calcium oxide), decarboxylation occurs, resulting in the formation of ethane.

Question 9

Gasoline is a mixture of alkanes with the number of carbon atoms ……………. A)C₃ + C₅ B)C₅ + C₆ C)C₆ + C₈ D)C₇ + C₉

Accepted Answer

The answer of Gasoline is a mixture of alkanes with...

Question 10

The final product of complete oxidation of hydrocarbons is ……….. A)Acid B)Aldehyde C)H₂O + CO₂ D)Dihydric alcohol

Accepted Answer

The final product of the complete oxidation of hydrocarbons is carbon dioxide (CO2) and water (H2O), which corresponds to choice C. This is a fundamental principle in chemistry, where hydrocarbons, when fully oxidized in the presence of sufficient oxygen, produce carbon dioxide and water as the end products.

Question 11

Which of the following will have least hindered rotation about carbon-carbon bond&#8230;&#8230;&#8230;&#8230;&#10;A)Ethane&#10;B)Ethylene&#10;C)Acetylene&#10;D)Hexachloroethane

Accepted Answer

The answer of Which of the following will have least...

Question 12

How many types of carbon atoms are present in 2, 2, 3trimethylpentane&#8230;&#8230;&#8230;..&#10;A)One&#10;B)Two&#10;C)Three&#10;D)Four

Accepted Answer

The answer of How many types of carbon atoms are...

Question 13

Which one gives only one monosubstitution product on chlorination&#8230;&#8230;&#8230;..&#10;A)n-pentane&#10;B)Neopentane&#10;C)Isopentane&#10;D)n-butane

Accepted Answer

The answer of Which one gives only one monosubstitution product...

Question 14

CH₄ is formed when…………. A)Sodium acetate is heated with sodalime B)Iodomethane is reduced C)Aluminium carbide reacts with water D)All of these

Accepted Answer

The answer of CH₄ is formed when…………. A)Sodium acetate is heated...

Question 15

Which one of the following compounds does not give addition reactions&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Aldehydes&#10;B)Alkanes&#10;C)Alkenes&#10;D)Alkynes

Accepted Answer

The answer of Which one of the following compounds does...

Question 16

The most important method of preparation of hydrocarbons of lower carbon number is&#8230;&#8230;&#8230;&#8230;.&#10;A)Pyrolysis of higher carbon number hydrocarbons&#10;B)Electrolysis of salts of fatty acids&#10;C)Sabatier and Senderen's reaction&#10;D)Direct synthesis

Accepted Answer

The answer of The most important method of preparation of...

Question 17

The inorganic origin of petroleum is indicated by the fact that&#8230;&#8230;&#8230;&#8230;..&#10;A)Its constituents can be separated by fractional distillation&#10;B)Carbon and hydrocarbon can combine by absorption of solar energy to give hydrocarbons&#10;C)Petroleum contains traces of chlorophyll&#10;D)Oil fields are located with the help of seismograph

Accepted Answer

The answer of The inorganic origin of petroleum is indicated...

Question 18

By Wurtz reaction, a mixture of methyliodide and ethyliodide gives&#8230;&#8230;&#8230;&#8230;.&#10;A)Butane&#10;B)Ethane&#10;C)Propane&#10;D)A mixture of the above three

Accepted Answer

The answer of By Wurtz reaction, a mixture of methyliodide...

Question 19

Product obtained by nitration of propane is &#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Nitropropane&#10;B)Nitromethane&#10;C)Nitroethane&#10;D)All of these

Accepted Answer

The answer of Product obtained by nitration of propane is...

Question 20

Isomerism in saturated hydrocarbons is due to&#8230;&#8230;&#8230;&#8230;..&#10;A)Change in the valence of carbon&#10;B)Change in the ratio of elements in compounds&#10;C)Formation of branches in the chain of C atoms&#10;D)Formation of double bond

Accepted Answer

The answer of Isomerism in saturated hydrocarbons is due to&#8230;&#8230;&#8230;&#8230;..&#10;A)Change...

Question 21

Which of the following is not linked with methane&#8230;&#8230;&#8230;&#8230;.&#10;A)Marsh gas&#10;B)Natural gas&#10;C)Producer gas&#10;D)Coal gas

Accepted Answer

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

Question 22

Which of the following has highest octane number&#8230;&#8230;&#8230;&#8230;..&#10;A)n-hexane&#10;B)n-heptane&#10;C)Iso-octane&#10;D)n-heptane and iso-octane mixed in ratio 50 : 50

Accepted Answer

The answer of Which of the following has highest octane...

Question 23

A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is&#8230;&#8230;&#8230;&#8230;..&#10;A)n-butane&#10;B)n-propane&#10;C)n-pentane&#10;D)n-hexan

Accepted Answer

The answer of A mixture of ethyl iodide and n-propyl...

Question 24

Most of the hydrocarbons from petroleum are obtained by&#8230;&#8230;&#8230;&#8230;&#8230;.&#10;A)Fractional distillation&#10;B)Fractional crystallization&#10;C)Vaporization&#10;D)Polymerization

Accepted Answer

The answer of Most of the hydrocarbons from petroleum are...

Question 25

Which is the best antiknock compound or Which one of the following substances is used as an antiknock compound &#8230;&#8230;&#8230;&#8230;&#8230;&#10;A)Lead tetrachloride&#10;B)Lead acetate&#10;C)Zinc ethyl&#10;D)Tetraethyl lead (TEL)

Accepted Answer

The answer of Which is the best antiknock compound or...

Deck 4: The Nature of Chemical Bonding