All Free Chemistry MCQs with Answers

• A. LiCl and CsCI
• B. NaCl and LiCI
• C. CsCI and NaCl
• D. CsCI and BeCl2

Explanation: To determine the compounds with the greatest and the least ionic character, we need to consider the electronegativity difference between…

• A. Aluminum is electron rich
• B. Aluminum is having lone pair of electron
• C. Aluminum donates lone Pair to form bridge
• D. Aluminum forms coordinate bonds with chlorine to complete Its octet

Explanation: The dimer of aluminum chloride is formed through the formation of coordinate bonds.

• A. I B
• B. VII A
• C. IV A
• D. VI A

Explanation: Group IV-A of the periodic table, also known as Group 14, contains elements that include non-metals, metalloids, and metals.

• A. BeSO4
• B. BaSO4
• C. MgSO4
• D. CaSO4

Explanation: BaSO4 (barium sulfate) is insoluble in water. When BaSO4 is added to water, it does not readily dissolve and remains as a solid precipitate.

• A. Beryllium
• B. Magnesium
• C. Calcium
• D. Strontium

Explanation: The correct answer is a) Beryllium. Among the given alkaline earth metals, beryllium is the exception that does not display a white color…

• A. Molecular crystals
• B. Ionic crystals
• C. Covalent crystals
• D. Metallic crystal

Explanation: Iodine is a molecular crystal due to its non-polar nature.

• A. Shielding
• B. Atomic number
• C. proton number
• D. Ionization energy

Explanation: Ionization energy always decreases down the group because atomic size increases which weakens the force of attraction between the nucleus…

• A. Na
• B. K
• C. Li
• D. Cs

Explanation: Na forms normal oxide during deficiency of oxygen and peroxide when provided with excess of oxygen.

• A. Benzene
• B. Toulene
• C. Ethylbenzene
• D. Xylene

Explanation: Benzene (C6H6) is a stable aromatic hydrocarbon. It consists of a ring of six carbon atoms bonded together with alternating single and…

• A. HF > HCL> HBr > HI
• B. HBr > HCl > HI
• C. HCl> HBr >HI > HF
• D. HI> HBr >HCl > HF

Explanation: The correct option is D: HI > HBr > HCl > HF. It correctly identifies iodine (I) as the most reactive halogen, followed by bromine (Br)…

• A. IA
• B. VA
• C. VIA
• D. VIIA

Explanation: Group 1-A elements being the most electropositive easily loose electrons that's why they are called reducing agents and alkali metals.

• A. 1s², 2s², 2p²
• B. 1s², 2s², 2p⁴
• C. 1s², 2s², 2p⁴, 3s²
• D. 1s², 2s², 2p⁴, 3s², 3p⁴

Explanation: The electronic configuration of carbon is: C = 1s², 2s², 2p²So, only option A is correct.

• A. NaOH
• B. LiOH
• C. KOH
• D. RbOH

Explanation: Except lithium hydroxide,all the alkali metal hydroxides are highly soluble in water.

• A. Blue
• B. Violet
• C. Yellow
• D. White

Explanation: The color of the flame produced burning magnesium metal is a bright white.

• A. Acetaldehyde
• B. Acetic acid
• C. Acetone
• D. Ethane

Explanation: When calcium acetate is dry-heated, it undergoes a decarboxylation reaction, resulting in the formation of acetone.The reaction can be…

• A. Ba
• B. Na
• C. K
• D. Cs
• E. Li

Explanation: Sodium (Na), an alkali metal from Group 1, gives a bright yellow flame during a flame test.

• A. Caustic soda
• B. Alum
• C. Borax
• D. Sulfuric acid
• E. Nitric acid

Explanation: The correct answer is Sulfuric acid (Option D). Historically, sulfuric acid was called 'oil of vitriol' because it was produced by…

• A. Oxygen
• B. Water
• C. Halogens
• D. Nitrogen
• E. Hydrogen

Explanation: Option C is correct. P-block elements primarily react with halogens to form binary compounds, such as halides.

• A. Aluminum oxide
• B. Magnesium oxide
• C. Potassium oxide
• D. Sodium oxide

Explanation: Aluminum oxide (Al₂O₃) is amphoteric, meaning it can exhibit both acidic and basic properties depending on the environment.

• A. Increase down the group
• B. Decrease down the group
• C. Increase then decrease down the group
• D. Doesn't change down the group

Explanation: The solubility of alkaline earth metal sulfates varies down the group and generally decreases as you move from beryllium to barium.