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 68 of 68
- A. B
- B. Na
- C. K
- D. Mg
Explanation: Boron (B) is more electronegative compared to the other elements listed (Na, K, and Mg).
Correct answer: K- A. Mg (OH)
- B. MgO
- C. MgO 10H2O
- D. MgO2
Explanation: Metals react with water under different conditions and produce metal oxide or hydroxide and liberate hydrogen gas.
Correct answer: MgO- A. Na
- B. Ca
- C. Sr
- D. Ba
Explanation: A flame test is an analytical procedure used by chemists to detect the presence of particular metal ions, based on the color of the flame…
Correct answer: Ba- A. calcium
- B. Potassium
- C. iron
- D. magnesium
Explanation: The Mohs scale of mineral hardness is used to compare the scratch resistance of different minerals.
Correct answer: iron- A. MgO and clay
- B. MgCO3 and clay
- C. MgSO4 and clay
- D. MgCO3 and CaCO3
Explanation: Refractory materials can withstand high temperatures. Refractory bricks are used in lining furnaces, kilns, fireboxes, and fireplaces.
Correct answer: MgO and clay- A. Sodium
- B. Potassium
- C. Strontium
- D. Calcium
Explanation: The correct answer is Strontium because it imparts a crimson red color to the flame when subjected to a flame test.
Correct answer: Strontium- A. CaSO4
- B. CaCO3
- C. CaCl2
- D. MgCO3
Explanation: In this reaction, dilute hydrochloric acid reacts with a carbonate compound, releasing carbon dioxide gas (CO2).
Correct answer: CaCO31348. The cation that distort the electron cloud of NO3− ion more and facilitates its decomposition is:
- A. Li+
- B. Mg2+
- C. Cs+
- D. Be2+
Explanation: Polarizability refers to the ability of a cation to distort the electron cloud of an anion in an ionic compound and the anionic cloud is…
Correct answer: Be2+- A. Diamond
- B. Graphite
- C. Coal
- D. Charcoal
Explanation: Diamond: Diamond is the inert form of carbon. It is a crystalline structure where each carbon atom is bonded to four neighboring carbon…
Correct answer: Diamond- A. Hg
- B. Pb
- C. Fe
- D. Sn
Explanation: Pb (Lead): If pellets containing lead (Pb) remain in the body, they can cause lead poisoning, which can result in neurological…
Correct answer: Pb- A. CH4
- B. C2H6
- C. C3H4
- D. C4H20
Explanation: The hydrolysis of Al4C3 (aluminum carbide) produces methane gas. The chemical equation for the hydrolysis reaction of Al4C3 can be…
Correct answer: CH4- A. Soda glass
- B. Water glass
- C. Jinna glass
- D. Pyrex glass
Explanation: Sodium silicate is commonly known as water glass, or soluble glass. It gets its name because it is essentially glass (silicon dioxide) in…
Correct answer: Water glass- A. Slow and exothermic
- B. Fast and exothermic
- C. Slow and endothermic
- D. Fast and endothermic
Explanation: The correct answer is that the conversion of carbonate to urea is slow and endothermic.
Correct answer: Slow and endothermic- A. Bauxite
- B. Borax
- C. Carborundum
- D. Colemanite
Explanation: The compound Na2B4O7 10 H2O is known as Borax. It is a naturally occurring mineral and a common household cleaning agent.
Correct answer: Borax- A. PbO + 4NaOH →Pb (OH)4 + 2 Na2O
- B. PbO + 2NaOH + H2O →Na2 [Pb(OH)4]
- C. PbO + NaOH + H2O →Na [Pb(OH)3]
- D. PbO + 4NaOH + H2O →Na4 [Pb(OH)6]
Explanation: When PbO hydrolyses in water and NaOH, Na2 [Pb(OH)4 is formed, thus B is correct.
Correct answer: PbO + 2NaOH + H2O →Na2 [Pb(OH)4]- A. Copper and zinc
- B. Copper and tin
- C. Zinc and tin
- D. Chromium and Tin
Explanation: Bronze is an alloy traditionally composed of copper and tin. Modern bronze is typically 88 percent copper and about 12 percent tin.
Correct answer: Copper and tin- A. SnO + 4NaOH --> Sn(OH)4 + 2Na2O
- B. SnO + 4NaOH --> Na4Sn (OH)4
- C. SnO + 2NaOH --> Na2Sn (OH)4
- D. None of the above
Explanation: The correct reaction for SnO and NaOH is: SnO + 2NaOH → Na2SnO2 + H2O. In this reaction, tin(II) oxide reacts with sodium hydroxide to…
Correct answer: None of the above- A. Isotropic
- B. Anisotropic
- C. good conductor of electricity
- D. Both (b) & (c)
Explanation: Graphite is one of the allotropic forms of carbon, and it is known to be anisotropic and a good conductor of electricity.
Correct answer: Both (b) & (c)- A. Xenon
- B. Radon
- C. Krypton
- D. Argon
Explanation: Radon is the only noble gas with no stable isotope: radon-222 is an alpha emitter with a half-life of about 3.8 days, produced in the…
Correct answer: Radon