All Free Chemistry MCQs with Answers

• A. Ionic
• B. Covalent
• C. Coordinate covalent
• D. All of these

Explanation: In the NH4Cl molecule, an ionic bond is formed between NH4+ and Cl- ions. 3 covalent bonds are formed between N and three H atoms.

• A. Attraction between atoms
• B. Size of molecule
• C. Nature of bond
• D. Shape of molecule

Explanation: Explanation:VESPR theory helps in explaining shape of molecules. The attraction between atoms is mainly explained by different theories…

• A. Caustic soda
• B. Lime water
• C. Alum
• D. Soda ash

Explanation: A is incorrect as caustic soda is not used as a coagulant.B is incorrect as lime water is not used as a coagulant,but is used to detect…

• A. Only translational motion
• B. Only vibrational motion
• C. Only rotational motion
• D. All motion is ceased

Explanation: At absolute zero, which is 0 Kelvin or -273.15°C, all molecular motion ceases.

• A. Forward activation energy < reverse activation energy
• B. Forward activation energy = reverse activation energy
• C. Forward activation energy > reverse activation energy
• D. No change

Explanation: In an endothermic reaction, the forward reaction generally requires more energy than the reverse reaction.

• A. Propane and methyl Grignard
• B. Methyl ethyl ketone and methyl
• C. Propanaldehyde and ethyl Grignard
• D. None of these

Explanation: The addition of Grignard reagent to aldehydes leads to the production of secondary alcohol, and the addition of ketone leads to the…

• A. Cu
• B. CuO
• C. Cu2O
• D. Cu2O + Cu2O3

Explanation: Fehling solution is reduced by aldehydes and a red precipitate of Cu2O is obtained.

• A. Diethyl ether
• B. Ethane
• C. Ethanal
• D. Ethanol

Explanation: When CH3CH2l reacts with dry Ag2O, the correct product formed is ethanol.

• A. C2H6
• B. C2H2Cl
• C. CH3OCH3
• D. C2H5OH

Explanation: Among the given compounds, C2H5OH (ethanol) has the highest boiling point.

• A. Alkoxides
• B. Ethane
• C. Alkane
• D. Alloyed

Explanation: Alcohols react with sodium to form a salt (sodium alkoxide) and bubbles of hydrogen gas will be seen.

• A. Carbonal
• B. Methanol
• C. Ethanol
• D. Glycol

Explanation: (D) is correct because the product of this reaction is ethylene glycol, which is a colorless, odorless, and slightly viscous liquid.

• A. Witting reaction
• B. Tollen test
• C. Lucas test
• D. Ninhydrin test

Explanation: The Lucas test is commonly used to differentiate between primary, secondary, and tertiary alcohols.

• A. 100% ethanol
• B. 95% ethanol
• C. 90% ethanol
• D. 35% ethanol

Explanation: Rectified spirit, also known as neutral spirits, is a high-purity ethanol solution that has undergone multiple distillation processes…

• A. Alcohols
• B. Phenols
• C. Amino acids
• D. Carboxylic acids

Explanation: The Lucas test is a chemical test used to differentiate between primary, secondary, and tertiary alcohols.

• A. Methanol
• B. Formaldehyde
• C. Formic acid
• D. Carbon dioxide gas

Explanation: The complete oxidation of methane in the presence of a copper catalyst at high pressure (200 atm) leads to the formation of methanol.

• A. CH3CH2OH + PCl5 →
• B. CH3CH2OH + Na →
• C. CH3CH2OH + PCl3 →
• D. CH3CH2OH + 5OCl →

Explanation: The correct answer is Option B: CH3CH2OH + Na →. In this reaction, sodium (Na), a metal, reacts with ethanol (CH3CH2OH) to form sodium…

• A. Primary alcohol
• B. Secondary alcohol
• C. Tertiary alcohol
• D. All of the above

Explanation: Ketones are prepared by the oxidation of secondary alcohols. When a secondary alcohol is oxidized, it loses hydrogen atoms and forms a…

• A. COCH3
• B. (CH 3)2 CHOH
• C. (CH3)3COH
• D. CH3CH2OH

Explanation: To undergo dehydrogenation, the compound must have OH group. Only compound in option A is not an alcohol thus, it is the correct answer.

• A. Benedicts reagent
• B. Tollen's reagent
• C. Lucas test
• D. None of the above

Explanation: The lucas test is used to differentiate between primary, secondary and tertiary alcohols,an oily layer of alkyl halides separates out in…

• A. Alkene
• B. Sodum alkoxide
• C. Alkane
• D. Ether

Explanation: When alcohols react with metals a salt is formed,the reaction when a monohydric alcohol reacts with sodium metal results in the production…