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 32 of 68
- A. N2O5
- B. N2O3
- C. NO2
- D. NO
Explanation: The brown gas formed when HNO_3 is reduced by metal to form nitrogen dioxide which is a poisonous brown gas with an irritating odou
Correct answer: NO2- A. NO
- B. N2O
- C. NO2
- D. N2O4
Explanation: Nitrous oxide, commonly known as laughing gas or happy gas, is a colorless, non-flammable gas.
Correct answer: N2O- A. Te
- B. Se
- C. S
- D. Pb
Explanation: Among all the elements Te) atomic number =74 , has the highest boiling point (5930°C) and melting point (3422°C ) and lowest vapor…
Correct answer: Te- A. The reaction does not go to completion
- B. The reaction is quite slow
- C. The reaction is highly exothermic
- D. SO3 is insoluble in water
Explanation: SO3 dissolution in water is extremely exothermic. This forces the sulfuric acid to form a mist of tiny droplets.
Correct answer: The reaction is highly exothermic- A. Na,K
- B. Mg and Ca
- C. Li and Ca
- D. None of these
Explanation: Similar to Mg and Ca, lithium nitrate (LiNO3) and calcium nitrate (Ca(NO3)2) also decompose differently.
Correct answer: Li and Ca- A. Gypsum
- B. Dolomite
- C. Calcite
- D. Plaster of Paris
Explanation: Chemical formula: CaSO4.H2O accurately represents the formula of gypsum, a naturally occurring mineral composed of calcium sulfate (CaSO4)…
Correct answer: Gypsum- A. Na
- B. H2
- C. O2
- D. Cl2
Explanation: The correct answer for the element produced at the cathode during the electrolysis of brine in a Nelson's cell is:(a) NaHere's…
Correct answer: Na- A. 2500⁰C
- B. 2600⁰C
- C. 2700⁰C
- D. 2800⁰C
Explanation: Calcium carbide (CaC2) is prepared by heating a mixture of lime (calcium oxide, CaO) and coke (carbon, C) in an electric furnace at…
Correct answer: 2700⁰C- A. Lose water and remain solid
- B. Gain water and remain solid
- C. Gain water and become liquid
- D. Remains unchanged
Explanation: Sodium carbonate monohydrate (Na2CO3.H2O) is a hygroscopic compound, meaning it readily absorbs moisture from the air.However, it loses…
Correct answer: Lose water and remain solid- A. They are more reactive
- B. They have greater atomic radii
- C. They have smaller atomic sizes
- D. All
Explanation: Alkaline earth metals have larger atomic radii than alkali metals due to the presence of an additional energy level (n=3) with…
Correct answer: They have greater atomic radii- A. sodium and lithium
- B. Lithium and magnesium
- C. Lithium and beryllium
- D. Boron and Beryllium
Explanation: The diagonal relationship occurs between elements lying diagonally across each other in the periodic table, typically from Group 1 (alkali…
Correct answer: Lithium and beryllium- A. Sodium
- B. Hydrogen
- C. Chlorine
- D. Oxygen
Explanation: The correct option for the product at the anode during the electrolysis of a dilute solution of sodium chloride (NaCl) is:(c)…
Correct answer: Chlorine- A. Na
- B. Cr
- C. K
- D. Li
Explanation: Complex formation: Complex formation generally involves transition metals due to their unique electronic properties.
Correct answer: Cr634. Which one is natron?
- A. Na2CO3
- B. Na2CO3.10H2O
- C. NaHCO3
- D. Na2HCO3.H20
Explanation: Na2CO3.10H2O, also known as sodium carbonate decahydrate, is the exact formula for natron.
Correct answer: Na2CO3.10H2O- A. PCl3 (phosphorus trichloride)
- B. P2O3 (diphosphorus trioxide)
- C. P2O5 (diphosphorus pentoxide)
- D. All of the above
Explanation: (a) PCl3 (phosphorus trichloride): Although PCl3 does liberate hydrochloric acid (HCl) alongside phosphoric acid as a byproduct, the…
Correct answer: All of the above- A. P2O5
- B. H2SO4
- C. Both a & b
- D. Electrode of electrolytic cell
Explanation: Acetic anhydride can be produced by treating ethyl alcohol with either of the following reagents:1.
Correct answer: Both a & b- A. Phosphine (PH3)
- B. Phosphorus (P)
- C. Water (H2O)
- D. phosphorus pentaoxide
Explanation: When heated or treated with a strong dehydrating agent like concentrated sulfuric acid, phosphorous acid (H3PO3) undergoes decomposition…
Correct answer: Phosphine (PH3)- A. 260°C
- B. 360°C
- C. 630°C
- D. 620°C
Explanation: The correct answer for the sublimation temperature of P2O5 is:(b) 360°C.P2O5, also known as diphosphorus pentoxide, is a white…
Correct answer: 360°C- A. S (sulfur)
- B. Se
- C. Te
- D. Po
Explanation: Non-metals in Group VIA:Sulfur (S): It's a non-metal with a characteristic yellow color and a strong, pungent odor.
Correct answer: S (sulfur)- A. hygroscopic
- B. Metals
- C. Polymeric
- D. All of the above
Explanation: The correct answer is (a) hygroscopic. Here's why:Hygroscopic: This means a substance readily absorbs moisture from the air.Group VIA…
Correct answer: hygroscopic