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

• A. Higher
• B. Lower
• C. Same
• D. Varies

Explanation: The melting point of Group I-A elements is lower than Group II-A elements.

• A. Li
• B. Mg
• C. Both
• D. None of these

Explanation: Both Li and Mg are highly reactive metals and do not occur in their free state in nature. They are found in combined states as compounds.

• A. Carbon
• B. Sulphur
• C. Nitrogen
• D. Calcium
• E. Both b and d

Explanation: Gypsum (CaSO₄·2H₂O) is a naturally occurring mineral that supplies both sulfur and calcium to the soil.

• A. It causes painful burns
• B. It has purgative smell
• C. It is manufactured by Castner-Kellner process
• D. It is used as an anti-acid
• E. Both b and d

Explanation: Caustic soda (NaOH) is a strong base. It causes painful burns on contact with skin. It is manufactured by the Castner-Kellner process.

• A. MgSO₄.H₂O
• B. MgSO₄.7H₂O
• C. CaSO₄.2H₂O
• D. PbCr₂O₇

Explanation: Epsom salt is a hydrated magnesium sulfate with the formula MgSO₄.7H₂O.

• A. Alkali
• B. Alkaline earth
• C. s block elements
• D. P block elements

Explanation: Group 1A and 11A elements are known as s-block elements. This is because their valence electrons occupy the s-orbital.

• A. Decreases down the group
• B. Increases down the group
• C. Remains same
• D. None of these

Explanation: The basic character of alkali metal oxides increases down the group. This is because the metallic character of the elements increases down…

• A. Na
• B. Al
• C. Fe
• D. Ca

Explanation: Sodium (Na) is a highly reactive alkali metal that reacts rapidly with water at room temperature to produce sodium hydroxide (NaOH) and…

• A. Ions
• B. Hydrogen gas
• C. Water
• D. None of these

Explanation: The fire produced when alkali metals react with water is due to the ignition of the hydrogen gas released during the reaction.

• A. White
• B. Pink
• C. Blue
• D. Green

Explanation: Epsom salt (MgSO₄.7H₂O) is a white crystalline solid. It is commonly used as a bath salt, laxative, and fertilizer.

• A. Charge on the nucleus
• B. Distance between nucleus and outer most electron
• C. Size of the atom
• D. None of these

Explanation: As you move down the group, the atomic size increases because additional electron shells are added.

• A. Feldspar
• B. Limestone
• C. Diamond
• D. None of these

Explanation: Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO₃).

• A. Spodumene
• B. Rock salt
• C. Carnallite
• D. Alunite

Explanation: Spodumene is a lithium aluminum silicate mineral with the formula LiAlSi₂O₆.

• A. MgSO4.7H2O
• B. MgCO3
• C. MgCO3.CaCO3
• D. Mg(SiO3)4

Explanation: Epsom salt is a hydrated magnesium sulfate with the chemical formula MgSO₄.7H₂O.

• A. Nitrogen
• B. Phosphorous
• C. Oxygen
• D. Sulphur

Explanation: Phosphorous (P) is a highly reactive nonmetal and does not occur in its free state. It is found in various minerals like phosphate rocks.

• A. NO
• B. NH4
• C. N₂O
• D. NO3

Explanation: Laughing gas is the common name for nitrous oxide (N₂O). It is a colorless, odorless gas that is used as an anesthetic and as an oxidizer…

• A. SO₂
• B. SCl₂
• C. H₂SO₄
• D. H₂SO₃

Explanation: The oxidation state of S in H₂SO₄ is +6, which is the highest oxidation state of sulfur.In SO₂ the oxidation state of S is +4.In SCl₂ the…

• A. Oxygen
• B. Sulphur
• C. Both
• D. None of these

Explanation: Allotropes are different structural modifications of the same element in the same physical state.

• A. 7
• B. 8
• C. 6
• D. 9

Explanation: Rhombic sulphur is one of the allotropic forms of sulphur. It has a crystalline structure where eight sulphur atoms are linked together in…

• A. Paint
• B. Textile
• C. Rubber
• D. Aluminum

Explanation: Sulfuric acid (H₂SO₄) is a highly corrosive strong acid that is widely used in many industries.