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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- A. Mn
- B. Ni
- C. Sb
- D. Sn
Explanation: Cassiterite is tin(IV) oxide, SnO2, so it is an important ore of tin, Sn.
Correct answer: Sn- A. Cl
- B. Br
- C. I
- D. F
Explanation: Chlorine has the greatest electron affinity among these elements because its larger atomic size allows an incoming electron to enter…
Correct answer: Cl- A. 2
- B. 3
- C. 4
- D. 5
Explanation: Orthophosphoric acid, H3PO4, has three ionisable hydrogen atoms attached to oxygen, so its basicity is 3.
Correct answer: 3- A. H3PO3
- B. H3PO4
- C. H3PO2
- D. H2P2O7
Explanation: In H3PO2, hydrogen has oxidation state +1 and oxygen has -2, so 3(+1) + P + 2(-2) = 0, giving P = +1.
Correct answer: H3PO2- A. smelting
- B. roasting
- C. calcinations
- D. froth floatation
Explanation: Smelting is the metallurgical process in which a metal or its compound is heated strongly, often with a reducing agent, to produce the…
Correct answer: smelting- A. +3
- B. +2
- C. +1
- D. +4
Explanation: Lanthanides most commonly lose their two 6s electrons and one additional electron to form the stable oxidation state +3.
Correct answer: +3- A. Be
- B. Cl
- C. K
- D. P
Explanation: Beryllium is called a bridge or diagonal element because it shows similarities with aluminium, which lies diagonally below it in the…
Correct answer: Be- A. Lother Meyer
- B. A.E de Chancourtois
- C. Newland
- D. Dobereiner
Explanation: The telluric helix was proposed by A.E. de Chancourtois, who arranged elements around a cylinder in order of increasing atomic weight and…
Correct answer: A.E de Chancourtois- A. Li, Be, B
- B. F, Cl, Br
- C. Cl, Br, I
- D. Na, K, Rb
Explanation: Dobereiner's triads contain three elements with similar properties, such as chlorine, bromine and iodine, written as F, Cl and Br in the…
Correct answer: Cl, Br, I- A. Fe>Co> Ni
- B. Co > Ni > Fe
- C. Ni> Co> Fe
- D. Co >Fe>Ni
Explanation: The atomic weights are Fe = 55.85 g mol-1, Co = 58.93 g mol-1 and Ni = 58.69 g mol-1.
Correct answer: Co > Ni > Fe- A. Cl2O
- B. Cl2O6
- C. ClO2
- D. Cl2O7
Explanation: The anhydride of an oxyacid is formed by removing water from the acid. For perchloric acid, 2HClO4 loses H2O to give Cl2O7, so the…
Correct answer: Cl2O7- A. XeF4
- B. XeOF4
- C. XeOF2
- D. Na4XeO6
Explanation: In XeOF4, fluorine contributes 4 x -1 = -4 and oxygen contributes -2, so xenon must be +6 because x - 4 - 2 = 0 and x = +6.
Correct answer: XeOF4- A. HF
- B. HBr
- C. HC
- D. HI
Explanation: The reducing strength of hydrogen halides increases down the group because the H-X bond becomes weaker, making the halide ion more willing…
Correct answer: HF- A. Xe
- B. Kr
- C. Rn
- D. All of the above
Explanation: Fluorine is sufficiently reactive to form compounds with the noble gases xenon, krypton and radon under suitable conditions, such as XeF2…
Correct answer: All of the above- A. All are non-metals
- B. All the halogens have electronic conviguration ns2p5
- C. They have high electron attinity and ionization energy
- D. All the halogens react with noble gases to form their halides
Explanation: Halogens do not all react with noble gases to form halides; noble gases are generally unreactive, although some xenon and krypton…
Correct answer: All the halogens react with noble gases to form their halides- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Iodine
Explanation: Fluorine has the highest electronegativity because its very small atomic radius and strong effective nuclear attraction pull bonding…
Correct answer: Fluorine- A. I2O4
- B. I4O2
- C. I2O5
- D. All are equally useful
Explanation: Iodine(V) oxide, I2O5, quantitatively oxidizes carbon monoxide to carbon dioxide: I2O5 + 5CO → I2 + 5CO2.
Correct answer: I2O5- A. Normal salt
- B. Double salt
- C. Mixed salt
- D. Complex
Explanation: Bleaching powder is represented approximately as Ca(OCl)Cl or CaOCl2 and contains chloride and hypochlorite ions associated with calcium…
Correct answer: Mixed salt- A. HCIO
- B. HCIO2
- C. HCIO3
- D. HCIO4
Explanation: For chlorine oxyacids, acidity increases with the number of oxygen atoms because additional oxygen atoms withdraw electron density and…
Correct answer: HCIO4- A. ns2p2
- B. ns2p4
- C. ns2p5
- D. ns2p6
Explanation: Group VIIA elements have seven valence electrons, filling the outer s subshell with two electrons and the p subshell with five electrons…
Correct answer: ns2p5