All Free Chemistry MCQs with Answers

• A. Aldehyde
• B. Alcohol
• C. Both A and B
• D. Ketone

Explanation: Aldole consists of both an Aldehyde group (-CHO) and an alcohol group (-OH) in the same molecule.

• A. Dipole dipole forces
• B. London dispersion forces
• C. Hydrogen bonding
• D. Covalent bonding

Explanation: Hydrogen bonds are formed between the individual molecules of the acid and water molecules.

• A. Are more reactive
• B. Have hydrogen bonding
• C. Have low melting point
• D. Have high density

Explanation: When added to water the carboxylic acids do not form dimers. Rather, hydrogen bonds are formed between the individual molecules of the…

• A. Aldehyde
• B. Alkyle Halide
• C. Ketones
• D. Alcohol

Explanation: Alcohol reacts with carboxylic acid to form ester

• A. Ether
• B. Alcohol
• C. Water
• D. Both Options A and B are correct

Explanation: The question directly lifts from a statement in the Punjab book (11 Biology, Chapter 2: Biological Molecules).

• A. H2
• B. He
• C. N2
• D. CO

Explanation: The real gas that acts most like an ideal gas is helium. Because it exists in a single atom and its vander waals forces are very low.

• A. Freezing effect
• B. Joule Thomson effect
• C. Boyles effect
• D. J Perrin effect

Explanation: Joule-Thomson effect, also called Joule-Kelvin effect, the change in temperature that accompanies expansion of a gas without production of…

• A. H2
• B. N2
• C. CO2
• D. Cl

Explanation: The least value of van der waal cont is of H2 because of its small size and non polar character i.e, 0.245 atm dm3/mol.

• A. Expansion factor
• B. Depression factor
• C. Compressibility factor
• D. Diffusion factor

Explanation: Compressibility Factor is also often defined as "the ratio of molar volume of gas to that of an ideal gas." It is expressed as Z = pV /…

• A. Freezing effect
• B. Joule Thomson effect
• C. Boyle's effect
• D. J.Perrin effect

Explanation: Answer: B Joule Thomson effect is the phenomenon accompanying a change in temperature due to a rapid change in the volume of a gas (rapid…

• A. 95.56g/dm3
• B. 64.51 g/dm3
• C. 74.42g/dm3
• D. 99.9 g/dm3

Explanation: The critical volume of oxygen 74.42 cm3/mol. So the correct answer is C.

• A. O2, H2
• B. O2, Na
• C. O2, SO2
• D. O2, S2O4-2

Explanation: Keeping in mind the electrochemical series; OH- gets discharged at the anode whereas H+ gets discharged at the cathode giving out O2 and…

• A. Fe
• B. Cu
• C. Zn
• D. Sn

Explanation: d) Sn (tin):The action of nitric acid (HNO3) on tin (Sn) does indeed produce nitric oxide (NO).

• A. Mercury
• B. Titanium
• C. Graphite
• D. Copper

Explanation: The explanation for this question will be added soon.

• A. Hall's
• B. Nelson's
• C. Down's
• D. Hoope's

Explanation: The explanation for this question will be added soon.

• A. NaCl, NaClO, H2O
• B. NaCl , NaClO3 , H2O
• C. NaClO , NaClO3, H2O
• D. NaCl , H2O

Explanation: Cold dilute sodium hydroxide and chlorine gas reaction is disproportionation.

• A. Electroplating
• B. Conductivity
• C. Galvanizing
• D. Metallurgy

Explanation: In electroplating, we have the object replacing the cathode and the metal, the anode.

• A. Lead-acid accumulator
• B. H2 - O2 fuel cell
• C. Silver oxide battery
• D. Alkaline battery

Explanation: All the sources listed except H2 - O2 fuel cells produce electrical energy but they need to be disposed of eventually.

• A. Water
• B. HCI
• C. Na+
• D. NaCl

Explanation: In a diaphragm cell, which is a type of electrolytic cell used for the production of chlorine and sodium hydroxide, hydrogen gas is…

• A. (NH4)2Cr2O7
• B. K2Cr207
• C. Zn(CIO3)2
• D. KCIO3

Explanation: Equations for each reaction: A- (NH4)2Cr2O7 (aq) ⇌ N2 (g) + 4 H2O (l) + Cr2O3 (s) [No oxygen released] B- 4 K2Cr2O7(1) ⇌ 4K2CrO4(1) + 2…