All Free Chemistry MCQs with Answers

• A. Azides
• B. Esters
• C. Ketones
• D. Ethers

Explanation: When carboxylic acids react with alcohols in the presence of catalytic amounts of mineral acids, they undergo an esterification reaction.

• A. Reduction
• B. Oxidation
• C. Hydrolysis
• D. None of above

Explanation: The process of converting a carboxylic acid into alcohol in the presence of LiAlH4 is reduction.

• A. FCH COOH
• B. CH3COOH
• C. CICH COOH
• D. C6H5CH,COOH

Explanation: Electronegativity increases the acidity by increasing the ionic character of O-H.

• A. CH3COOH
• B. CH2ClCOOH
• C. CHCl2COOH
• D. CCl3COOH

Explanation: The acidity of a carboxylic acid is influenced by the presence of substituents that can stabilize the carboxylate ion.

• A. CH3COOH
• B. C2H5NH2
• C. CH3COCH3
• D. CH3CH2OH

Explanation: The correct answer is CH3COOH. Carboxylic acids, such as acetic acid (CH3COOH), react with sodium bicarbonate (NaHCO3) to produce carbon…

• A. CH3COOH
• B. CH3CH2COOH
• C. C6H5CG2COOH
• D. FCH2COOH

Explanation: D is the correct option, as it contains a halogen which have strong electron-withdrawing effects.

• A. CH3COOH >> CHCl2COOH > CH2ClCOOH
• B. CHCl2COOH > CH2ClCOOH > CH3COOH
• C. CH3COOH > CHCl2COOH > CH2ClCOOH
• D. CHCl2COOH >> CH2COOH > CH2ClCOOH

Explanation: The acidity of carboxylic acids is influenced by the presence of electron-withdrawing groups.

• A. Option A: Acetic acid reacts with sodium to form sodium acetate and hydrogen gas.
• B. Option B: Acetic acid reacts with ethanol in the presence of sulfuric acid to form ethyl acetate and water.
• C. Option C: Acetic acid reacts with phosphorus pentoxide to form acetic anhydride.
• D. Option D: Acetic acid reacts with ammonia to form acetyl chloride and water.

Explanation: The correct answer is Option D. Acetic acid does not react with ammonia to form acetyl chloride and water; instead, it usually forms…

• A. CH3COOH
• B. C2H5OH
• C. C2H2O-C2H5
• D. (CH3CH2)3N

Explanation: CH3COOH (acetic acid) has the highest boiling point among the options at 118°C, primarily due to its ability to form strong hydrogen…

• A. (CH4 - CH2)3 N
• B. C2H3OH
• C. C2H3 - O - C2H3
• D. CH3COOH

Explanation: Acetic acid (CH3COOH) has the highest boiling point among the compounds you mentioned.

• A. Ethanol
• B. Acetic acid
• C. Chloroacetic acid
• D. Fluoroacetic acid

Explanation: Fluoroacetic acid (FCH2COOH) is the strongest acid among the options provided.

• A. Hydrogen
• B. Nitrogen
• C. Methane
• D. Sulphur dioxide

Explanation: For gas to deviate from ideal behavior, there should be significant intermolecular forces present in the gas.

• A. High temperature only
• B. High pressure only
• C. High pressure and low temperature
• D. Low pressure and high temperature

Explanation: High pressure and low temperature: Both high pressure and low temperature amplify intermolecular forces, leading to greater deviations…

• A. Bronstect effect
• B. Joule Thomson effect
• C. Graham's effect
• D. Dalton's effect

Explanation: Therefore, the correct term is the "Joule-Thomson effect," which describes the cooling observed when a gas expands rapidly without any…

• A. Xe
• B. H2
• C. CO2
• D. He

Explanation: Helium is an inert gas that exists as a single atom, resulting in the lowest conceivable van der Waals dispersion forces.

• A. I, II, and III
• B. I and II only
• C. I and III only
• D. II and III only

Explanation: More significantly, the Van der Waals equation takes into consideration the molecular size and molecular interaction forces (attractive…

• A. Pressure
• B. Volume
• C. Temperature
• D. Concentration

Explanation: The compressibility factor (Z) is a measure of how much a gas deviates from ideal gas behavior.

• A. Ethane
• B. Potassium iodate (V)
• C. Sodium hydroxide
• D. Potassium hydroxide

Explanation: Chlorine reacts with sodium hydroxide to give NaCl and NaClO where oxidation states of Cl are different.

• A. ZnSO4
• B. FeSO4
• C. AgNO3
• D. All of the above

Explanation: For a metal to be displaced in a salt solution, the metal being added must be more reactive than the metal cation in the salt.

• A. Decomposition
• B. Redox
• C. Hydration
• D. Precipitation

Explanation: In a redox reaction, one substance is oxidized during the reaction (oxidation number increases) and another is reduced (oxidation number…