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 53 of 68
- A. Zn
- B. Ba
- C. Sr
- D. Ca
Explanation: Zinc does not give a characteristic flame test because its flame color is not distinctive.
Correct answer: Zn- A. Toluene
- B. Alcohol
- C. Benzene
- D. Kerosene oil
Explanation: Alcohol is correct because alcohols can react with sodium metal, posing a safety hazard.
Correct answer: Alcohol- A. Ca and Ba
- B. Mg and Al
- C. Ca and Mg
- D. Na
Explanation: Dolomite is a double carbonate mineral composed of calcium (Ca) and magnesium (Mg). It has the chemical formula CaMg(CO3)2.
Correct answer: Ca and Mg- A. [Ar] 3d10 4s2
- B. [Ne] 3d23p2
- C. [Ar] 4s2
- D. [Ar] 3d10 4s1
Explanation: Alkaline earth metals belong to Group 2 of the periodic table, which includes elements like beryllium (Be), magnesium (Mg), calcium (Ca)…
Correct answer: [Ar] 4s21045. Dead burnt gypsum is:
- A. CaSO4 . 2H2O
- B. CaSO4 .1/2 H2O
- C. CaSO4
- D. MgSO4 . 7H2O
Explanation: It represents the anhydrous form of calcium sulfate, which is dead burnt gypsum.
Correct answer: CaSO4- A. 1%
- B. 10%
- C. 4%
- D. 2%
Explanation: When water is added to plaster of Paris, it undergoes a chemical reaction called hydration, forming gypsum.
Correct answer: 1%- A. NaO2
- B. Na2O2
- C. Na2O
- D. Na2O3
Explanation: This is sodium peroxide, formed when sodium burns in excess air. Therefore,option b is the correct answer.
Correct answer: Na2O2- A. CaCO3
- B. Ca(OH)2 . H2O
- C. Ca(OH)2
- D. CaSO4
Explanation: This is the correct formula for slaked lime, also known as calcium hydroxide. It's formed when calcium oxide (quicklime) reacts with water.
Correct answer: Ca(OH)2- A. Enlarged root system in plants
- B. Chlorophyll development in leaves
- C. Good yield of crops
- D. Control of pH of soil
Explanation: Sulfur can affect soil pH when it reacts with water to form sulfuric acid or sulfate ions, thereby influencing soil acidity.
Correct answer: Control of pH of soil- A. H2
- B. Na
- C. Cl2
- D. O2
Explanation: Hydrogen gas is produced at the cathode during the electrolysis of brine (sodium chloride solution) in Nelson's cell.
Correct answer: H2- A. Be
- B. Mg
- C. Ca
- D. Sr
Explanation: Beryllium is amphoteric, which means it can react with both acids and bases (alkalis).
Correct answer: Be- A. 800oC
- B. 600oC
- C. 1800oC
- D. 900oC
Explanation: This is the correct operating temperature of a Down's cell. The temperature is kept around 600°C to ensure that the electrolyte (a mixture…
Correct answer: 600oC- A. Dolomite
- B. Gypsum
- C. Calcite
- D. Asbestos
Explanation: The composition CaMg3(SiO3)4 corresponds to asbestos, a group of fibrous silicate minerals.
Correct answer: Asbestos- A. KCl
- B. NaCl
- C. MgCl2
- D. SrCl2
Explanation: NaCl, is the correct answer as halite is the mineral name for sodium chloride.
Correct answer: NaCl- A. Be
- B. Ra
- C. Ba
- D. Rn
Explanation: Radon is not an alkaline earth metal; it is a noble gas. Radon is a radioactive, colorless, and odorless gas that is formed naturally as a…
Correct answer: Rn- A. Acidic
- B. Basic
- C. Amphoteric
- D. None of these
Explanation: Beryllium oxide (BeO) exhibits amphoteric behavior, meaning it can react with both acids and bases.
Correct answer: Amphoteric- A. KNO3
- B. KNO2
- C. Na2B4O7
- D. Na2CO3 . H2O
Explanation: Potassium nitrate has the chemical formula KNO3, and it is commonly known as saltpetre or saltpeter.
Correct answer: KNO3- A. Gypsum
- B. Dolomite
- C. Calcite
- D. Epsom salt
Explanation: CaSO4 . 2H2O is commonly known as gypsum. It's a soft sulfate mineral composed of calcium sulfate dihydrate.
Correct answer: Gypsum- A. H2
- B. Na
- C. Cl2
- D. O2
Explanation: During the electrolysis of brine in a diaphragm cell, hydrogen gas is indeed deposited at the cathode.
Correct answer: H2- A. Gypsum
- B. Dolomite
- C. Calcite
- D. Plaster of Paris
Explanation: CaSO4.1/2H2O is also known as Plaster of Paris.
Correct answer: Plaster of Paris