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Jeevith Publications 2nd PUC Chemistry Objective for Students
LPG is a blend of
a) methane and butane
b) propane and butane
c) methane and propane
d) ethane and propane
Option b – propane and butane
Which substance is mixed with LPG for detecting leakage by its smell?
a) Methanol
b) Ethanol
c) Thioethanol
d) Chloroform
Option c – Thioethanol
The term CNG refers to
a) Compressed Natural Gas
b) Cyanogen Natural Gas
c) Condensed Nitrogen Gas
d) Controlled Natural Gas
Option a – Compressed Natural Gas
The quality of diesel is indicated by its
a) cetane number
b) octane number
c) gold number
d) Avogadro’s number
Option a – cetane number
The smell that helps detect a leak in LPG comes from
a) Methane
b) Propane
c) Butane
d) Ethyl mercaptan
Option d – Ethyl mercaptan
Ethanol used as a bio-fuel is commonly derived from
a) sugarcane
b) potato
c) rice
d) wheat
Option a – sugarcane
Biogas is generated through the process of
a) fermentation
b) oxidation
c) aerobic respiration
d) reduction
Option a – fermentation
Which of the following has a similar energy value to petrol?
a) Methane
b) Kerosene
c) CNG
d) LPG
Option b – Kerosene
What is Gasohol made of?
a) Gasoline and methanol
b) Gasoline and ethanol
c) Gasoline and propanol
d) Methanol and ethanol
Option b – Gasoline and ethanol
What is the function of glycol in aviation fuel?
a) To slow down petrol evaporation
b) To boost petrol efficiency
c) To prevent the fuel from freezing
d) To reduce petrol usage
Option c – To prevent the fuel from freezing
Which material can absorb hydrogen at low temperatures and release it using engine heat?
a) Hydride
b) Coals
c) Soapstone
d) Resins
Option a – Hydride
Which statement(s) is/are correct? ( Jeevith Publications 2nd PUC Chemistry MCQ )
I. Diesel engines run better on fuels with low octane ratings.
II. Using low-octane gasoline can cause engine knocking.
a) Only I
b) Only II
c) Both I and II
d) Neither I nor II
Option c – Both I and II
Which features make modern cars more fuel-efficient?
I. Radial tyres
II. Streamlined design
III. Multipoint fuel injection
IV. Catalytic exhaust converter
a) I and II
b) II and III
c) II, III and IV
d) I, III and IV
Option d – I, III and IV
Which of the following statements is true?
I. LNG is stored under very cold temperatures and high pressure for easy transport.
II. India’s first LNG terminal was set up in Hassan.
III. Natural gas materials like ethane and propane are separated from LPG.
a) Only I
b) I and III
c) II and III
d) I, II, and III
Option a – Only I
Why is CNG considered an environmentally friendly fuel? ( Jeevith Publications 2nd PUC Chemistry MCQ )
I. It produces minimal amounts of sulfur and nitrogen oxides.
II. It causes less environmental pollution.
III. It emits fewer greenhouse gases.
a) Only I and II
b) Only II and III
c) Only I and III
d) All I, II, and III
Option c – Only I and III
Substances that turn into vapour during burning give rise to
a) Brent crude
b) flame
c) diesel
d) petroleum
Option b – flame
The temperature in the innermost part of a flame is ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) highest
b) lowest
c) medium
d) varies from high to low
Option b – lowest
What is the color of the middle part of a flame?
a) Yellow
b) Black
c) Red
d) White
Option a – Yellow
Which part of the flame is used by goldsmiths to heat gold? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Inner zone
b) Middle zone
c) Outer zone
d) None of these
Option c – Outer zone
Why does carbon usually form covalent bonds?
a) It has four electrons in its outer shell.
b) Forming C4+ or C4− ions requires a lot of energy.
c) It shares electrons to complete its octet.
d) All of the above
Option d – All of the above
Which compounds undergo addition reactions? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Saturated hydrocarbons (alkanes)
b) Only alkenes
c) Only alkynes
d) Both alkenes and alkynes
Option d – Both alkenes and alkynes
What is product A in the reaction:
CH₃COOH + Na₂CO₃ → A + CO₂ + H₂O
a) CH₃COONa
b) CH₂(Na)COOH
c) NaOH
d) NaHCO₃
Option a – CH₃COONa
Which compound is part of the alkyne homologous series?
C₆H₆, C₂H₆, C₂H₄, C₃H₄
a) C₆H₆
b) C₂H₄
c) C₂H₆
d) C₃H₄
Option d – C₃H₄
What is the molecular formula of an alkene with four carbon atoms? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) C₂H₁₀
b) C₄H₈
c) C₂H₆
d) C₄H₄
Option b – C₄H₈
What is the IUPAC name for CH₃COOC₂H₅?
a) Ethyl ethanoic acid
b) Butanoate
c) Ethyl ethanoate
d) Ethyl methyl carboxylic acid
Option c – Ethyl ethanoate
Which of the following is the first compound in the alkyne series? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Propyne
b) Ethyne
c) Methane
d) Ethene
Option b – Ethyne
In the diamond structure, each carbon atom is connected to four other carbon atoms, forming
a) a hexagonal lattice
b) a rigid 3D framework
c) a spherical structure
d) a ring-like arrangement
Option b – a rigid 3D framework
A soap molecule consists of ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) a hydrophobic head and a hydrophobic tail
b) a hydrophobic head and a hydrophilic tail
c) a hydrophilic head and a hydrophilic tail
d) a hydrophilic head and a hydrophobic tail
Option d – a hydrophilic head and a hydrophobic tail
When ethanoic acid reacts with sodium bicarbonate, the gas released is
a) Hydrogen
b) Carbon dioxide
c) Methane
d) Carbon monoxide
Option b – Carbon dioxide
Complete oxidation of ethanol results in the formation of ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Ethanoic acid
b) Carbon dioxide and water
c) Ethanal
d) Acetone
Option b – Carbon dioxide and water
Which of the following gives a sweet-smelling ester when heated with ethanol and a few drops of sulfuric acid?
a) CH₃COOH
b) CH₃CH₂OH
c) CH₂OH
d) CH₃CHO
Option a – CH₃COOH
Identify the functional group present in CH₃COCH₃. ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Alcohol
b) Carboxylic acid
c) Ketone
d) Aldehyde
Option c – Ketone
Choose the correct statements regarding carbon compounds:
(i) Most carbon compounds conduct electricity well.
(ii) Most carbon compounds are poor conductors of electricity.
(iii) The intermolecular forces in carbon compounds are relatively weak.
(iv) The intermolecular forces in carbon compounds are quite strong.
a) (ii) and (iv)
b) (ii) and (iii)
c) (i) and (iv)
d) (i) and (iii)
Option b – (ii) and (iii)
The compound C₃H₈ belongs to which homologous group?
a) Alkynes
b) Alkenes
c) Alkanes
d) Cycloalkanes
Option c – Alkanes
How many structural isomers exist for pentane?
a) 2
b) 3
c) 4
d) 5
Option b – 3
Which of the following compounds can undergo an addition reaction? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) CH₄
b) C₃H₈
c) C₂H₆
d) C₂H₄
Option d – C₂H₄
Arrange the following fuels in increasing order of their calorific value:
- Hydrogen
- Kerosene
- Charcoal
- Wood
a) 4, 3, 2, 1
b) 4, 2, 3, 1
c) 1, 2, 3, 4
d) 1, 3, 2, 4
Option a – 4, 3, 2, 1
Why are sodium sulfate and sodium silicate added to detergent powder? ( Jeevith Publications 2nd PUC Chemistry MCQ )
- To keep the powder dry
- To preserve the alkaline nature of the powder
a) Only 1
b) Only 2
c) Both 1 and 2
d) Neither 1 nor 2
Option c – Both 1 and 2
Which of the following fertilizers does not contain nitrogen?
- Superphosphate of lime
- Urea
- Indian saltpeter
- Chile saltpeter
a) 1, 3 and 4
b) 1 and 3
c) 1 only
d) 3 only
Option c – 1 only
Read the following statements and select the correct option:
Assertion (A): Carbohydrates, although covalent, dissolve in water.
Reason (R): Compounds capable of forming hydrogen bonds with water tend to be water-soluble.
a) Both A and R are correct, and R is the correct explanation of A
b) Both A and R are correct, but R is not the correct explanation of A
c) A is correct but R is incorrect
d) A is incorrect but R is correct
Option a – Both A and R are correct, and R is the correct explanation of A
A hydrocarbon has the formula C₆H₁₂. It does not undergo hydrogenation to form C₆H₁₄, nor does it react with chlorine to produce C₆H₁₂Cl₂. Based on this, C₆H₁₂ is likely to be:
a) A saturated hydrocarbon
b) An unsaturated hydrocarbon
c) A straight-chain hydrocarbon
d) A cycloalkane
Option d – A cycloalkane
Which of the following is typically true for carbon-based compounds?
a) They are good conductors of heat and electricity
b) They are poor conductors of electricity
c) The molecules have strong intermolecular forces
d) The molecules do not exhibit strong intermolecular forces
Option d – The molecules do not exhibit strong intermolecular forces
What causes reduced visibility during winter? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Formation of fossil fuels
b) Presence of suspended unburnt carbon or hydrocarbons in the air
c) Inadequate energy supply
d) None of the above
Option b – Presence of suspended unburnt carbon or hydrocarbons in the air
Evaluate the following statements:
A. All hydrocarbons exhibit isomerism
B. Members of a homologous series share similar physical and chemical traits
C. Cyclic hydrocarbons may be either saturated or unsaturated and consist of carbon rings
D. Artificial detergents are sodium or potassium salts of long-chain carboxylic acids
a) Only C
b) Only D
c) A, B, and C
d) A, C, and D
Option a – Only C
C₆H₁₂ does not react with either hydrogen or chlorine. This hydrocarbon can be:
a) A saturated and unsaturated hydrocarbon
b) A linear and cyclic hydrocarbon
c) A cyclic and unsaturated hydrocarbon
d) A saturated hydrocarbon and a cycloalkane
Option d – A saturated hydrocarbon and a cycloalkane
Which substances are directly derived from crude oil? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Asphalt and paraffin wax only
b) Paraffin wax and fatty acids
c) Asphalt and gas oil only
d) Asphalt, paraffin wax, and gas oil
Option d – Asphalt, paraffin wax, and gas oil
Consider the following statements:
Assertion (A): Methane is the primary component of LPG
Reason (R): Methane is used as a domestic and industrial fuel and can be delivered through pipelines
a) Both A and R are correct, and R explains A
b) Both A and R are correct, but R is not the explanation of A
c) A is correct, R is incorrect
d) A is incorrect, R is correct
Option d – A is incorrect, R is correct
An organic liquid with molecular formula C₂H₂O is straight-chained and lacks any carbon-carbon double bonds. This compound could be: ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) An alcohol and an ester
b) An aldehyde and a ketone
c) An ester and a ketone
d) A ketone and an alcohol
Option b – An aldehyde and a ketone
Which statements are accurate regarding natural gas?
A. Its major component is methane and it is used as vehicle fuel
B. It serves as a raw material in fertilizer production
C. It is used in electricity generation
D. It is an unlimited natural resource
a) A, B, and C
b) B, C, and D
c) C, D, and A
d) D, A, and B
Option a – A, B, and C
Identify the correct properties of gaseous fuels:
A. They burn without producing smoke
B. They have low calorific value
C. They ignite easily
D. They possess high calorific value
a) A and B
b) B and C
c) C and D
d) D and B
Option c – C and D
Among the given energy sources, which is the most eco-friendly?
a) Ethanol
b) Biogas
c) CNG
d) Hydrogen
Option c – CNG
In fuel cell-powered vehicles, which gas undergoes combustion to provide energy?
a) Methane
b) Hydrogen
c) LPG
d) CNG
Option b – Hydrogen
Biogas is primarily composed of ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Methane and Carbon dioxide
b) Methane and Nitric oxide
c) Methane, Hydrogen, and Nitric oxide
d) Methane and Sulphur dioxide
Option a – Methane and Carbon dioxide
In which group is functional group isomerism not found?
a) Alcohols
b) Aldehydes
c) Alkyl halides
d) Cyanides
Option c – Alkyl halides
Which element cannot be identified using Lassaigne’s test? ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) Iodine
b) Chlorine
c) Sulphur
d) Fluorine
Option d – Fluorine
A reaction involving alkaline KMnO₄ and a compound Y, followed by acidification, yields compound X. When X is treated with Y in the presence of a few drops of H₂SO₄, it forms a sweet-smelling product Z. What are X, Y, and Z?
a) Ethanol, Ethene, Ethanoic Acid
b) Ethanoic Acid, Ethanol, Ethyl ethanoate
c) Ethanoic Acid, Ethanal, Ethene
d) Ethanol, Ethanoic Acid, Sodium ethanoate
Option c – Ethanoic Acid, Ethanal, Ethene
The compound C₆H₁₂O₄ contains: ( Jeevith Publications 2nd PUC Chemistry MCQ )
a) 22 atoms per molecule
b) Twice the percentage by mass of hydrogen compared to carbon
c) Six times the mass percent of carbon relative to hydrogen
d) Three times the mass percent of hydrogen compared to oxygen
Option c – Six times the mass percent of carbon relative to hydrogen
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