All Free Chemistry MCQs with Answers

• A. 3, 2, -2, 1/2
• B. 3, 3, 1, -1/2
• C. 0, 3, 1, -1/2
• D. 3, 1, 1, -1/2
• E. Both B and C

Explanation: The correct answer is Option E both B and C : 3, 3, 1, -1/2. According to the rules of quantum numbers, the azimuthal quantum number l…

• A. n = 2, l = 0, m = 0, s = +1/2
• B. n = 1, l = 1, m = 0, s = -1/2
• C. n = 1, l = 0, m = 0, s = +1/2
• D. n = 1, l = 0, m = 1, s = +1/2

Explanation: The correct four quantum numbers for an electron in the K-shell are:Principal quantum number (n) = 1, which defines the energy…

• A. nh
• B. nh /2pie
• C. h/2i
• D. 2.5h/h

Explanation: The angular momentum of the electron is given by : nh/2pie where n=1,2,3...etc. and in option 'B' n=2,hence it is the correct option.

• A. The population increase is due to the number of people who are born in any year being greater than the number who dies.
• B. The population increase is due to the number of people who are born in any year being greater than the number who die.
• C. The population increase are due to the number of people who are born in any year being greater than the number who die.
• D. The population increase is due to the number of people who is born in any year being greater than the number who die.

Explanation: The population increase is due to the number of people who are born in any year being greater than the number who die.

• A. Silverdale train station can be reached by going the left at this road junction.
• B. The Silverdale train station can be reached by going left at this road junction.
• C. Silverdale train station can be reached by going left at this road junction.
• D. Silverdale train station can be reached by going to left at this road junction.

Explanation: It's correct - the phrase "can be reached by going left" properly shows direction and means the station is accessible by turning left at…

• A. It is a vehicle through which to teach children how to behave and how to feel about himself and others.
• B. It is a vehicle through which to teach children how to behave and how to feel about themselves and others.
• C. It is a vehicle through which to teach children how to behave and how to feel about yourselves and others.
• D. It is a vehicle through which to teach children how to behave and how to feel about themself and others.

Explanation: Option (B) is the correct choice as it uses the reflexive pronoun "themselves" correctly to refer to the children learning how to behave…

• A. Addition
• B. Substitution
• C. Polymerization
• D. Aromatization

Explanation: Benzene does not undergo polymerisation reaction due to the aromaticity of the ring.

• A. Lanthanides and actinides.
• B. s and p block elements.
• C. Chalcogens and halogens
• D. d and f block elements.

Explanation: Transition element are those elements which lie between s and p-block elements and their properties are also between s and p-block elements.

• A. Straight line parallel to x-axis
• B. Straight line parallel to y-axis
• C. Straight line passing through origin
• D. Curve

Explanation: If 1/V is plotted on the X-axis and pressure on the Y-axis at constant temperature, a straight line passing through the origin will…

• A. SO2
• B. Cl
• C. SO3
• D. No nucleophile is formed

Explanation: In the reaction between acetic acid and thionyl chloride, the chloride ion (Cl-) acts as the nucleophile.

• A. CO2
• B. Alkane
• C. Ester
• D. Acidamide

Explanation: A carboxylic acid first reacts with ammonia to form ammonium carboxylate, RCOO-NH4+, and heating removes water to form the acid amide…

• A. Aromatic
• B. Dicarboxylic
• C. Hydrocarbons
• D. Fumaric acid

Explanation: Both phthalic acid and oxalic acid share the crucial characteristic of being dicarboxylic acids.

• A. 2 amino groups and 1 carboxylic group
• B. 1 amino and i carboxylic groups
• C. 2 carboxylic groups and 1 amino group
• D. 2 amino and 2 carboxylic groups

Explanation: Acidic amino acids have (c) 2 carboxylic groups and 1 amino group. The term "acidic" in this context refers to the presence of an…

• A. Citric acid
• B. Benzoic acid
• C. Lactic acid
• D. Tartaric acid

Explanation: Citric acid is present in lemon juice. It is a natural acid that imparts the characteristic sour taste to citrus fruits, including lemons.

• A. Ninhydrin test
• B. Molisch test
• C. Bluretic test
• D. Benedict test

Explanation: Citric acid is present in lemon juice. It is a natural acid that imparts the characteristic sour taste to citrus fruits, including lemons.

• A. CO2
• B. Alkane
• C. Ester
• D. Acetamide

Explanation: When an ammonium salt of a carboxylic acid is heated, it undergoes a dehydration reaction, losing a molecule of water (H₂O) and forming an…

• A. monocarboxyle acid
• B. aromatic carboxylic acid
• C. dicarboxylic acid
• D. none of these

Explanation: Picric acid is not a monocarboxylic acid, dicarboxylic acid, or an aromatic carboxylic acid.

• A. C15H31COOH
• B. C13H27COOH
• C. C16H32COOH
• D. C17H35COOH

Explanation: Palmitic acid is a saturated fatty acid with 16 carbon atoms. Its formula reflects this chain length and functional groups, accurately…

• A. proteins and oils
• B. fats and proteins
• C. fats and oils
• D. all above

Explanation: Aliphatic monocarboxylic acids have a single straight-chain hydrocarbon backbone with a carboxylic acid group at the end.Fats and oils are…

• A. Carboxylic acid
• B. Ethanol
• C. Phenol
• D. Ethyne

Explanation: Acid strength decreases as pka increases, and ethyne has the highest pka (-25) among the options.