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Jeevith Publications 2nd PUC Chemistry Objective for Students
LPG is a mixture of
(a) methane and butane
(b) butane and propane
(c) methane and propane
(d) ethane and propane
Option b – butane and propane
Which one among the following agents is added to domestic LPG cylinders to help in the detection of gas leakage?
(a) Methanol
(b) Ethanol
(c) Thioethanol
(d) Chloroform
Option c – Thioethanol
CNG is
(a) Compressed Natural Gas
(b) Cyanogen Natural Gas
(c) Condensed Nitrogen Gas
(d) Controlled Natural Gas
Option a – Compressed Natural Gas
Quality diesel is measured in terms of its
(a) cetane number
(b) octane number
(c) gold number
(d) Avogadro’s number
Option a – cetane number
The stench due to leakage from the LPG cylinder is because of
(a) Methane
(b) Propane
(c) Butane
(d) Ethyl mercaptan
Option d – Ethyl mercaptan
In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from
(a) sugarcane
(b) potato
(c) rice
(d) wheat
Option a – sugarcane
Biogas is formed through
(a) fermentation
(b) oxidation
(c) aerobic respiration
(d) reduction
Option a – fermentation
Which of the following fuels has a calorific value equal to petrol?
(a) Methane
(b) Kerosene
(c) CNG
(d) LPG
Option b – Kerosene
Gasohol is a mixture of
(a) gasoline and methanol.
(b) gasoline and ethanol.
(c) gasoline and propanol.
(d) methanol and ethanol.
Option b – gasoline and ethanol
Glycol is added to aviation gasoline because it
(a) reduces the evaporation of petrol.
(b) increase the efficiency of petrol.
(c) prevents freezing of petrol.
(d) reduce consumption of petrol.
Option c – prevents freezing of petrol
Hydrogen gas can be conveniently used as fuel for running vehicles if it is absorbed at a very low temperature by a substance only to be released at the temperature generated by the exhaust. What is that substance found in India?
(a) Hydride
(b) Coals
(c) Soapstone
(d) Resins
Option a – Hydride
Consider the following statements. I. Fuels with low octane numbers are ideal for diesel engines. II. The use of gasoline with low octane numbers may lead to the problem of engine knocking. Which of the statement(s) given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
Option c – Both I and II
Consider the following features of newer models of motor cars. I. Radial tyres II. Streamlined body III. Multipoint fuel injection IV. Catalytic converter with exhaust Which of these features make the new models of motor cars more fuel efficient?
(a) I and II
(b) II and III
(c) II, III and IV
(d) I, III and IV
Option d – I, III and IV
Consider the following statements I. Liquefied Natural Gas (LNG) is liquefied under extremely cold temperatures and high pressure to facilitate storage or transportation in specially designed vessels. II. The First LNG terminal in India was built in Hassan. III. Natural Gas Matters (NGM) are separated from LPG and these include ethane, propane, butane, and natural gasoline. Which of the statements given above is/are correct?
(a) Only I
(b) I and III
(c) II and II
(d) I, II, and III
Option a – Only I
How CNG is a cleaner fuel? I. It produces oxides of Sulphur and Nitrogen in very small amounts. II. It makes the environment less polluted. III. It emits less 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
The substances which vaporize during burning give
(a) Brent crude
(b) flame
(c) diesel
(d) petroleum
Option b – flame
The innermost region of flame has the temperature
(a) highest
(b) lowest
(c) medium
(d) high to low
Option b – lowest
The middle region of the flame has color.
(a) Yellow
(b) Black
(c) Red
(d) White
Option a – Yellow
Which one of the flames is used by the Goldsmith to heat the gold?
(a) Innermost region
(b) Middle region
(c) Outermost region
(d) None of these
Option c – Outermost region
Why does carbon form compounds mainly by covalent bonding?
(a) There are four electrons in the outermost shell of carbon.
(b) It requires a large amount of energy to form C4+ or C4sup>4-.
(c) It shares its valence electrons to complete its octet.
(d) All of the above.
Option d – All of the above
Addition reactions are undergone by
(a) saturated hydrocarbons (alkanes)
(b) only alkenes
(c) only alkynes
(d) both alkenes and alkynes
Option d – both alkenes and alkynes
Identify ‘A’ in the following reaction: CH3COOH + Na₂CO3 → A+ CO₂ + H₂O
(a) CH3COONa
(b) CH₂(Na)COOH
(c) NaOH
(d) NaHCO3
Option a – CH3COONa
Which of the following belongs to the homologous series of alkynes? C6H6, C₂H6, C₂H4, C3H4.
(a) C6H6
(b) C₂H4
(c) C₂H6
(d) C3H4
Option d – C3H4
A hydrocarbon has four carbon atoms. Give its molecular formula if it is an alkene.
(a) C₂H10
(b) C4H8
(c) C₂H6
(d) C4H4
Option b – C4H8
Give the IUPAC name of CH3COOC₂H5.
(a) Ethyl ethanoic acid
(b) Butanoate
(c) Ethyl ethanoate
(d) Ethyl methyl carboxylic acid
Option c – Ethyl ethanoate
The first member of the alkyne homologous series is
(a) propyne
(b) ethyne
(c) methane
(d) ethene
Option b – ethyne
In a diamond, each carbon atom is bonded to four other carbon atoms to form
(a) a hexagonal array
(b) a rigid three-dimensional structure
(c) a structure in the shape of a football
(d) a structure of a ring
Option b – a rigid three-dimensional structure
A soap molecule has an
(a) hydrophobic head and hydrophobic tail
(b) hydrophobic head and a hydrophilic tail
(c) hydrophilic head and a hydrophilic tail
(d) hydrophilic head and hydrophobic tail
Option d – hydrophilic head and hydrophobic tail
When ethanoic acid is treated with NaHCO^ the gas evolved is
(a) H₂
(b) CO₂
(c) CH4
(d) CO
Option b – CO₂
Ethanol on complete oxidation gives
(b) CO₂ and water
(c) ethanal
(d) acetone/ethanone
Option b – CO₂ and water
Which of the following will give a pleasant smell of ester when heated with ethanol and a small quantity of sulphuric acid?
(a) CH3COOH
(b) CH3CH₂OH
(c) CH₂OH
(d) CH3CHO
Option a – CH3COOH
Name the functional group present in CH3COCH3.
(a) Alcohol
(b) Carboxylic acid
(c) Ketone
(d) Aldehyde
Option c – Ketone
Which of the following statements is correct for carbon compounds? (1) Most carbon compounds are good conductors of electricity. (ii) Most carbon compounds are poor conductors of electricity. (iii) Force of attraction between molecules of carbon compounds is not very strong. (iv) Force of attraction between molecules of carbon compounds is very strong.
(a) (ii) and (iv)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
C3H8 belongs to the homologous series of
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cycloalkanes
Option c – Alkanes
The number of isomers of pentane is
(a) 2
(b) 3
(c) 4
(d) 5
Option b – 3
Which of the following will undergo additional reactions?
(a) CH4
(b) C3H8
(C) C₂H6
(d) C₂H4
Option d – C₂H4
The correct order of these fuels in terms of their calorific value in increasing order is 1. Hydrogen gas 2. Kerosine oil 3. Charcoal 4. 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
Consider the following statements: The purpose of adding sodium sulphate and sodium silicate to washing powder is 1. To keep washing powder dry 2. To maintain the alkalinity of the powder which of these statements is/are correct?
(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 does not contain nitrogen elements? 1. Superphosphate of lime 2. Urea 3. Indian saltpeter 4. Chile saltpeter
(a) 1, 3 and 4
(b) 1 and 3
(c) 1 only
(d) 3 only
Option c – 1 only
The following question consists of two statements, one labeled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below: Assertion (A): Though carbohydrates are covalent compounds, they are soluble in water. Reason (R): Compounds that form a hydrogen bond with water are generally soluble in water.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true A
Option a – Both A and R are individually true and R is the correct explanation of A
A hydrocarbon has a molecular formula of C6H12. It does not react with hydrogen to give C6H14 nor does it react with chlorine to give C6H12Cl₂. The hydrocarbon C6H12 is A. A saturated hydrocarbon B. An unsaturated hydrocarbon C. An open chain hydrocarbon D. A cycloalkane
(a) A and B
(b) C and D
(c) D and B
(d) A and D
Option d – A and D
Which of the following statements is usually correct for carbon compounds? These (A) are good conductors of heat and electricity (B) are poor conductors of electricity (C) have strong forces of attraction between their molecules (D) do not have strong forces of attraction between their molecules
(a) (A) and (C)
(b) (B) and (C)
(c) (A) and (D)
(d) (B) and (D)
Option d – (B) and (D)
Low visibility during cold weather is due to
(a) the formation of fossil fuels.
(b) unburnt carbon particles or hydrocarbons suspended in the air.
(c) lack of adequate power supply.
(d) none of these
Option b – unburnt carbon particles or hydrocarbons suspended in the air
Consider the following statements : (A) All hydrocarbons show phenomena of isomerism. (B) The members of a homologous series have similar chemical and physical properties. (C) Cyclic hydrocarbons are saturated or unsaturated organic compounds that contain rings of carbon atoms. (D) Synthetic detergents are sodium or potassium salts of long-chain carboxylic acids. Which of the above statement(s) is/are correct?
(a) Only (C)
(b) Only (D)
(c) (A), (B), and (C)
(d) (A), (C), and (D)
Option a – Only (C)
A hydrocarbon has a molecular formula of C6H12. It does not react with hydrogen to give C6H14 nor does it react with chlorine to give C6H₁2Cl₂. The hydrocarbon C6H12is (A) A saturated hydrocarbon (B) An unsaturated hydrocarbon (C) An open chain hydrocarbon (D) A cyclo-alkane
(a) (A) and (B)
(b) (C) and (D)
(c) (D) and (B)
(d) (A) and (D)
Option d – (A) and (D)
Consider the following: Crude oil is a direct source of 1. Asphalt 2. Paraffin wax 3. Fatty acids 4. Gas oil. Which of the above is correct?
(a) 1 and 2 only
(b) 2 and 3
(c) 1 and 4 only
(d) 1, 2 and 4
Option d – 1, 2 and 4
Consider the following statements and select the correct code. Assertion (A): The main constituent of liquefied petroleum gas is methane. Reason (R): Methane can be used directly for burning in homes and factories where it can be supplied through pipelines. Codes :
(a) Both A and Rare are true, and R is the correct explanation of A. and R are true, but R is not the correct
(b) Both A explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Option d – A is false, but R is true
An organic compound is a clear liquid having a molecular formula C₂H₂O. It has an open chain structure. Without any carbon-carbon double bond. The compound can be (A) alcohol (B) an ester (C) an aldehyde (D) a ketone
(a) (A) and (B)
(b) (C) and (D)
(c) (B) and (D)
(d) (D) and (A)
Option b – (C) and (D)
What is true about natural gas? A. Its main component is methane and is used as a fuel in motor cars. B. It is used as the raw material for manufacturing fertilizers. It is used for the generation of electricity. D. It is an inexhaustible natural source.
(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
The gaseous fuels A. burn without producing smoke. B. has a low calorific value. C. are easy to ignite. D. have a high calorific value. Select the correct alternative.
(a) A and B
(b) B and C
(c) C and D
(d) D and B
Option c – C and D
Among the following fuels of energy, which is the most environmentally friendly?
(a) Ethanol
(b) Biogas
(c) CNG
(d) Hydrogen
Option c – CNG
In a fuel cell-driven vehicle, the energy is obtained from the combustion of
(a) Methane
(b) Hydrogen
(c) LPG
(d) CNG
Option b – Hydrogen
The main constituents of biogas are
(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 of the following functional group isomerism is not possible?
(a) Alcohols
(b) Aldehydes
(c) Alkyl halides
(d) Cynides
Option c – Alkyl halides
Which one of the following elements cannot be detected by “Lassaigne’s test”?
(a) I
(b) CI
(c) S
(d) F
Option d – F
A compound X is obtained by the reaction of alkaline KMnO4 with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of a few drops of H₂SO4 to form a sweet-smelling compound Z. The compounds X, Y, and Z are, respectively.
(a) Ethanol, Ethene, Ethanoic Acid
(b) Ethanoic Acid, Ethanol, Ethylethanoate
(c) Ethanoic Acid, Ethanal, Ethene
(d) Ethanol, Ethanoic Acid, Sodium Ethanoate
Option c – Ethanoic Acid, Ethanal, Ethene
The compound C6H1204 contains ( Jeevith publications 2nd puc chemistry )
(a) 22 atoms per mole
(b) twice the mass percent of H as compared to the mass percent of C
(c) six times the mass percent of C as compared to the mass percent of H
(d) thrice the mass percent of H as compared to the mass percent of O
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