Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 questions · page 48 of 68
- A. Ag
- B. Mg and Al
- C. Ca
- D. All
Explanation: Magnesium and aluminium can be obtained by the electrolytic reduction of their ores respectively, as they are highly reactive metals with…
Correct answer: Mg and Al- A. Horn silver
- B. Calcite
- C. Hamatite
- D. Magnesite
Explanation: Haematite is the correct answer because it has magnetic properties, making it suitable for separation using magnetic separation…
Correct answer: Hamatite- A. Lime stone
- B. Magnesia
- C. Silica
- D. Coke
Explanation: In the smelting of copper ore SiO2 is used as a flux as it forms FeSiO2 as fusible slag.
Correct answer: Silica- A. Zone refining
- B. Poling
- C. Electrolytic refining
- D. Cupelling
Explanation: Electrolytic refining is the most effective method for obtaining high purity copper, with a purity level of 99.99%.
Correct answer: Electrolytic refining- A. Electrolysis of fused MgCl2
- B. Reducing calcined dolomite with ferrosilicon at high temperature under pressure.
- C. Both are correct
- D. None is correct
Explanation: In the Pidgeon process, magnesium is produced by reducing calcined dolomite with ferrosilicon at high temperature under pressure.
Correct answer: Reducing calcined dolomite with ferrosilicon at high temperature under pressure.- A. Size of IIA is greater than IA
- B. LE of IIA is higher than IA
- C. LE of IIA is less than IA
- D. IIA provide more binding electron
Explanation: The melting points of Group IIA elements are considerably higher than those of Group IA elements because Group IIA elements (alkaline…
Correct answer: IIA provide more binding electron- A. Be
- B. Ca
- C. Mg
- D. Sr
Explanation: Among the elements Be, Mg, Ca, and Sr, Magnesium (Mg) has the lowest melting point.
Correct answer: Mg- A. IA
- B. VIIA
- C. VIIIA
- D. VA
Explanation: In the case of alkali metals (Group IA), the melting and boiling points decrease down the group due to the weakening of metallic bonding…
Correct answer: IA- A. Alkali
- B. Amphoteric
- C. Acidic
- D. None of these
Explanation: The elements of group I-A, also known as the alkali metals, react violently with water to produce hydrogen gas and a basic solution of the…
Correct answer: Alkali- A. Decomposition
- B. Acid-base
- C. Combustion
- D. All of these
Explanation: The correct answer is Option B: Acid-base. The reaction between lithium oxide (Li2O) and water (H2) to form lithium hydroxide (LiOH) is…
Correct answer: Acid-base- A. Ba
- B. Li
- C. Ca
- D. All of these
Explanation: Barium is an alkaline earth metal that can form peroxides with Oxygen. Ba+O2500-600°C BaO2 (Barium peroxide).
Correct answer: Ba- A. Mg
- B. Ca
- C. Sr
- D. Ba
Explanation: Barium is a highly reactive metal that requires storage under oil to prevent contact with air.
Correct answer: Ba- A. Na
- B. Rb
- C. K
- D. Cs
Explanation: The correct answer is Cesium (Cs) because as you go down the group of alkali metals, the atomic size increases leading to higher density.
Correct answer: Cs- A. The atomic and ionic radii increase from Be to Ra
- B. Hardness of alkaline earth metals decreases from Be to Ra
- C. Electropositive character decreases from Be to Ra
- D. Melting and boiling points generally decrease from Be to Ra
Explanation: The correct statement is that the atomic and ionic radii increase from Be to Ra.
Correct answer: Electropositive character decreases from Be to Ra- A. Alkaline earth metals are less reactive than alkali metals
- B. Alkaline earth metals except Mg react with dilute acid to give hydrogen gas
- C. Alkaline earth metals are less basic than alkali metals
- D. Alkaline earth metals form ionic bonds with electronegative elements
Explanation: The correct answer is Option B. While most alkaline earth metals react with dilute acids to produce hydrogen gas, magnesium (Mg) also…
Correct answer: Alkaline earth metals except Mg react with dilute acid to give hydrogen gas- A. MgO
- B. SiO2
- C. Al2O3
- D. NO2
Explanation: Magnesium oxide (MgO) is the correct answer as it is an insoluble oxide of an alkaline earth metal, making it unlikely to dissolve in…
Correct answer: MgO- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct answer is Option B. The statement is incorrect because it mistakenly describes the properties of alkaline earth metals (Group…
Correct answer: Option B- A. The elements of both the families are strongly electropositive
- B. All the elements of the two families are highly reactive
- C. None of the elements of the two families occur in the' free state in nature.
- D. The bicarbonates of all the elements of the two families are insoluble in water
Explanation: The correct answer is Option D: The bicarbonates of all the elements of the two families are insoluble in water.
Correct answer: The bicarbonates of all the elements of the two families are insoluble in water- A. Na and K
- B. Li and Na
- C. K and Rb
- D. Rb and Cs
Explanation: Caesium reacts explosively with water, potentially shattering the container, to form caesium hydroxide and hydrogen.
Correct answer: Rb and Cs- A. The alkali metals have one electron in their valence shells whereas the alkaline earth metals have two electrons
- B. The alkaline earth metals are harder and heavier than alkali metals
- C. The carbonates and sulphates of alkali metals except Li2CO3 are soluble in water, whereas those of alkaline earth metals are insoluble
- D. Reactions of alkaline earth metals are more vigorous than those of alkali metals
Explanation: The incorrect statement about alkali and alkaline earth metals is Reactions of alkaline earth metals are more vigorous than those of…
Correct answer: Reactions of alkaline earth metals are more vigorous than those of alkali metals