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 45 of 68
- A. 20
- B. 30
- C. 100
- D. 10
Explanation: The correct answer is Option C: 100. Perhydrol, also known as hydrogen peroxide (H2O2), has a volume strength of 100, indicating a highly…
Correct answer: 100- A. NaHCO3
- B. NaHSO3
- C. Na2SO3
- D. NaHSO4
Explanation: The correct answer is Option C: Na2SO3. Sodium carbonate reacts with SO2 in aqueous solution to give Na2SO3.
Correct answer: Na2SO3- A. K2CO3 is more soluble
- B. K2CO3 is less soluble
- C. KHCO3 is more soluble than NaHCO3
- D. KHCO3 is less soluble than NaHCO3
Explanation: The Solvay process relies on the precipitation of bicarbonates. In the case of sodium, NaHCO3 is less soluble and precipitates out easily…
Correct answer: KHCO3 is more soluble than NaHCO3- A. Be++ < Mg++ < Ca++ < Ba++ < Si++
- B. Si++ < Ba++ < Ca++ < Mg++ < Be++
- C. Ba++ < Si++ < Ca++ < Mg++ < Be++
- D. Ba++ < Si++ < Mg++ < Ca++ < Be++
Explanation: Hydration energy is inversely related to the size of the cation. Smaller cations have higher hydration energy because they can attract…
Correct answer: Ba++ < Si++ < Ca++ < Mg++ < Be++- A. Ionization energy
- B. Solubility of their hydroxides
- C. Solubility of their sulphates
- D. Electronegativity
Explanation: The correct answer is Option B: Solubility of their hydroxides. The property of alkaline earth metals that increases with their atomic…
Correct answer: Solubility of their hydroxides- A. CaCl2
- B. CaSO4
- C. HClO
- D. Ca(ClO3)2
Explanation: The correct answer is HClO. The bleaching action of bleaching powder is due to the formation of hypochlorous acid (HClO).
Correct answer: HClO- A. d-d transition in the solvated metal ion
- B. presence of unpaired electron
- C. charge - transfer transition
- D. absorption of light by the solvated electrons.
Explanation: Alkaline earth metals produce a bright blue color when dissolved in liquid ammonia due to the presence of solvated electrons.
Correct answer: absorption of light by the solvated electrons.- A. Mg(NO3)2
- B. Mg3N2
- C. NH3
- D. MgO
Explanation: The correct answer is Mg3N2. When magnesium (X) is heated in nitrogen, it forms magnesium nitride (Y).
Correct answer: Mg3N2- A. Ba(OH)2
- B. Mg(OH)2
- C. Sr(OH)2
- D. Ca(OH)2
Explanation: Barium hydroxide (Ba(OH)2) is the correct answer. The solubility trend of hydroxides of Group 2A metals increases as you move down the…
Correct answer: Ba(OH)2- A. KO2
- B. SiO2
- C. TiO2
- D. BaO2
Explanation: KO2 (potassium superoxide) is the correct answer as it contains an unpaired electron, making it paramagnetic and attracted to a magnetic…
Correct answer: KO2- A. Al3+
- B. Na+
- C. Be2+
- D. Mg3+
Explanation: The correct answer is option B: Na^+. The hydration energy of Mg^2+ is greater than that of Na^+ because Na^+ has lesser ionization energy…
Correct answer: Na+- A. Al4C3
- B. CaC2
- C. VC2
- D. SiC2
Explanation: Aluminum carbide (Al4C3) is the correct answer as it reacts with water to produce aluminum hydroxide and methane.
Correct answer: Al4C3- A. NO
- B. N2O
- C. H2
- D. NO2
Explanation: When magnesium reacts with very dilute nitric acid, it forms magnesium nitrate and hydrogen gas is evolved.
Correct answer: H2- A. NaOH, Na2O, Li2O
- B. Na2CO3, Na2O2, Li2O
- C. Na2O, Li3N, NH3
- D. Na2O, Li2O, Li3N
Explanation: When Na and Li are placed in dry air, we get a mixture of sodium oxide (Na2O) and lithium oxide (Li2O).
Correct answer: Na2O, Li2O, Li3N- A. H-(aq) + H2O → H3O+
- B. H-(aq) + H2O → OH- + H2
- C. H- + H2O→ H2 + O2
- D. H- + H2O → No reaction
Explanation: When sodium hydride (NaH) is dissolved in water, the hydride ion (H-) being a stronger base than hydroxide ion (OH-) reacts with water to…
Correct answer: H-(aq) + H2O → OH- + H2- A. X is lithium hydride (LiH)
- B. X is BeH2
- C. X is beryllium dichloride dihydrate (BeCl2 · 2H2O)
- D. X is beryllium hydride (BeH2)
Explanation: In the given chemical equation, BeCl2 reacts with LiAlH4 to produce 2BeH2, LiCl, and AlCl3. Therefore, the correct identity of X is BeH2.
Correct answer: X is BeH2- A. NaAlO2
- B. NaHCO3
- C. Na2CO3
- D. Na2O2
Explanation: During the reaction, Na reacts with Al2O3 at high temperatures to yield Na2O and Al.
Correct answer: Na2CO3898. CsBr3 contains:
- A. Cs-Br covalent bonds
- B. Cs3+ and Br- ions
- C. Cs+ and Br3- ions
- D. Cs3+ and Br33- ion
Explanation: CsBr3 is an ionic compound. Cs is a monovalent ion, i.e., Cs+. So, the other ion will be Br3−.
Correct answer: Cs+ and Br3- ions- A. NaNO3
- B. KNO3
- C. Na2CO3
- D. LiNO3
Explanation: Upon heating, LiNO3 decomposes as follows: 4LiNO3 → 2Li2O + 4NO2 + O2. The decomposition releases nitrogen dioxide (NO2), a coloured gas…
Correct answer: LiNO3- A. Only CO2 is released
- B. CO & CO2 are released
- C. Only CO is released
- D. Water vapour is released
Explanation: When washing soda is heated, it loses all water of crystallisation and becomes anhydrous sodium carbonate.
Correct answer: Water vapour is released