Free s-Block and p-Block Elements MCQs with Answers

• A. 1 Only
• B. 2 Only
• C. 3 and 4 only
• D. 1,2,3 and 4

Explanation: Lithium exhibits unique properties among alkali metals. It reacts slowly with water, forms stable complex compounds, is harder and lighter…

• A. It is non-reactive metal
• B. It forms stable layer of oxide
• C. It has non-reactive nature with the acid
• D. It has small size

Explanation: Beryllium becomes passive on reaction with concentrated nitric acid (HNO3) because it forms a thin, protective layer of beryllium oxide…

• A. It is as hard as iron.
• B. It is not resistant towards complete oxidation.
• C. Its melting and boiling points are higher than other alkaline earth metal.
• D. It is the only member of alkaline earth metals which reacts with sodium hydroxide to produce hydrogen gas.

Explanation: Beryllium, in particular, is quite resistant towards complete oxidation, even by acids, because of its BeO coating.

• A. Li
• B. Na
• C. K
• D. Cs

Explanation: The element that reacts only with nitrogen and carbon is lithium (Li). It forms specific compounds with these elements, distinguishing it…

• A. Be
• B. K
• C. Cl
• D. P

Explanation: The correct answer is beryllium (Be) because it is considered a bridge element with properties that are intermediate between elements in…

• 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.