All Free Chemistry MCQs with Answers

• A. Be
• B. Zn
• C. Al
• D. Ca

Explanation: CaO is a basic oxide, and when it reacts with acid, salt and water are produced.

• A. Be(OH)2
• B. Ca(OH)2
• C. Sr(OH)2
• D. Ba(OH)2

Explanation: The correct answer is Be(OH)2 because it is the most insoluble hydroxide among the IIA group elements.

• A. Be and Mg
• B. Ca and Ba
• C. Ba and Sr
• D. Sr and Ca

Explanation: Barium and Strontium are the elements in Group IIA that form peroxides when treated with oxygen.

• A. Low value of ionization enthalpy
• B. Low enthalpy of atomization
• C. Both A and B
• D. Neither A nor B

Explanation: The reactivity of alkali metals is a result of both their low ionization energy and low enthalpy of atomization.

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

Explanation: All four statements in Option D are correct and highlight the anomalous properties of lithium and its diagonal relationship with…

• A. Be
• B. Mg
• C. Ca
• D. Sr

Explanation: Among Group IIA elements, the metallic radius generally increases as you move down the group.

• A. K2O
• B. MgO
• C. CaO
• D. Al2O3

Explanation: To determine the basic nature of oxides, we look at the elements' positions in the periodic table.

• A. K
• B. Li
• C. Na
• D. Cs

Explanation: When exposed to oxygen, lithium forms the normal oxide Li2O. This is why option B is correct.

• A. Be
• B. Mg
• C. Ca
• D. Sr

Explanation: Beryllium forms an insoluble oxide (BeO) when it reacts with oxygen, making it practically insoluble in water.

• A. Ba(NO3)2 and Ca(OH)2
• B. BaSO4 and CaCO3
• C. CaCO3 and MgSO4
• D. Ca(OH)2 and MgCO3

Explanation: The correct answer is B, which includes BaSO4 (barium sulfate) and CaCO3 (calcium carbonate).When a mixture of white solids Z is treated…

• A. Th
• B. Al
• C. In
• D. B

Explanation: Boron forms boron oxide (B2O3), which is an acidic oxide and it also shows a diagonal relationship with Si.

• A. Green
• B. Yellow
• C. Golden yellow
• D. Violet

Explanation: The characteristic flame color of sodium is indeed golden yellow, making option C the correct choice.

• A. B
• B. Al
• C. In
• D. Tl

Explanation: As you move down group IIIA, the size of the atoms increases, leading to weaker forces of attraction and lower melting and boiling points.

• A. Hydrides
• B. Hydrogen halides
• C. Halides
• D. Salts

Explanation: The correct answer is D, which is 'Salts.'When basic oxides react with acidic oxides, they form salts through a reaction known as…

• A. Be
• B. Mg
• C. Ba
• D. Ca

Explanation: Barium is located at the bottom of Group 2, and it is the largest and most metallic element among the options.

• A. Li2CO3
• B. Na2CO3
• C. K2CO3
• D. Rb2CO3

Explanation: All alkali metal carbonates are generally stable and do not decompose upon heating, except for lithium carbonate (Li₂CO₃).

• A. F
• B. Al
• C. Be
• D. Ga

Explanation: Option a is correct. Fluorine doesn't form polymeric halides due to its unique characteristics such as small size, high ionization energy…

• A. Mg is less electropositive than calcium
• B. Mg is lower then Ca in the relative reactivity series
• C. The chance of hydration of Mg 2+ is less exothermic than of Ca2+
• D. The solubility product of Mg(OH)2 is lower than that of Ca(OH)2

Explanation: The solubility product (Ksp) is a measure of the equilibrium solubility of a compound in water.

• A. B
• B. Al
• C. Ga
• D. Tl

Explanation: Thallium (Tl) is the correct answer because it is a metal from Group IIIA (Group 3) of the periodic table that can form basic oxides.Basic…

• A. Francium
• B. Cesium
• C. Rubidium
• D. Radium

Explanation: Among the options provided, only Radium is not an alkali metal. Alkali metals are located in the first column of the periodic table…