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 8 of 68
- A. urea
- B. DAP
- C. Ammonium sulphate
- D. Ammonium nitrate
Explanation: Urea, DAP and ammonium sulfate are commonly used nitrogen or nitrogen-phosphorus fertilizers in rice cultivation.
Correct answer: Ammonium nitrate- A. Cu
- B. Cl
- C. H
- D. Zn
Explanation: Hydrogen is a macronutrient because plants require it in relatively large amounts as part of water and organic compounds.
Correct answer: H- A. It enhances plant growth
- B. It is involved in the synthesis of protein and nucleic acids
- C. it accelerates fruits and flowers growth
- D. It is involved in the chlorophyll synthesis
Explanation: Nitrogen supports vegetative growth and is needed to form proteins, nucleic acids and chlorophyll.
Correct answer: it accelerates fruits and flowers growth- A. urea
- B. calcium superphosphate
- C. diammonium phosphate
- D. potassium nitrate
Explanation: Diammonium phosphate, (NH4)2HPO4, contains both nitrogen in the ammonium ions and phosphorus in the phosphate ion, so it supplies both…
Correct answer: diammonium phosphate- A. N P K
- B. N K C
- C. N S P
- D. N Ca P
Explanation: Nitrogen, phosphorus and potassium are the three primary macronutrients required by plants and are represented by the fertiliser notation…
Correct answer: N P K- A. boron
- B. iron
- C. copper
- D. carbon
Explanation: Carbon is a macronutrient because plants require it in large amounts to build carbohydrates, proteins, lipids and other organic compounds.
Correct answer: carbon- A. Equal to 1.7
- B. Greater than 1.7
- C. Less than 1.7
- D. No specificity exists
Explanation: In the usual electronegativity-difference guideline, a difference greater than 1.7 indicates predominantly ionic bonding because electron…
Correct answer: Greater than 1.7- A. Increases
- B. Decreases
- C. Remain constant
- D. Variable trend
Explanation: Electronegativity generally increases from left to right across a period because nuclear charge increases while shielding changes little…
Correct answer: Increases- A. Metals
- B. Non metals
- C. Liquids
- D. Solids
Explanation: Ionization energy is the energy needed to remove an electron from a gaseous atom.
Correct answer: Non metals- A. Increases
- B. Decreases
- C. No change
- D. Variable trend
Explanation: Ionization energy generally increases across a period as effective nuclear charge increases and atomic radius decreases, making electron…
Correct answer: Increases- A. Increases
- B. Decreases
- C. No change
- D. Variable trend
Explanation: Ionic radius generally increases down a group because each successive element has an additional electron shell, increasing the distance of…
Correct answer: Increases- A. Gain stability
- B. Form a bond
- C. Complete its outermost shell
- D. all are accurate justifications
Explanation: Atoms may lose or gain electrons to obtain a more stable electronic arrangement, often by completing their valence shell, and this…
Correct answer: all are accurate justifications- A. F
- B. Cl
- C. Br
- D. I
Explanation: Chlorine has the highest electron affinity among F, Cl, Br and I because its larger 3p orbital accommodates the added electron with less…
Correct answer: Cl- A. Ionization energy
- B. Electron affinity
- C. Electro negativity
- D. None of the above
Explanation: Electronegativity is the relative attraction an atom exerts on shared electrons in a chemical bond.
Correct answer: Electro negativity- A. IA and VIA
- B. IA IIA and VIIA
- C. IB and VIIB
- D. IA and IB
Explanation: Highly ionic compounds are most readily formed between electropositive metals of groups IA and IIA and electronegative halogens of group…
Correct answer: IA IIA and VIIA- A. Electronegative
- B. Electropositive
- C. Neutral
- D. IA is electropositive while IIA is electronegative
Explanation: Group IA and IIA elements readily lose their outer electrons and therefore show electropositive character.
Correct answer: Electropositive- A. Ionization potential
- B. Electronegativity
- C. Electron affinity
- D. Activation energy
Explanation: Electron affinity is the energy change when an electron is added to an isolated gaseous atom; it is often described as energy released or…
Correct answer: Electron affinity- A. Greater
- B. Lesser
- C. Remain same
- D. No effect
Explanation: Greater shielding reduces the effective nuclear attraction experienced by the outer electron, so less energy is needed to remove it and…
Correct answer: Lesser- A. Ionization potential
- B. Electronegativity
- C. Electron affinity
- D. Activation energy
Explanation: Ionization potential, or ionization energy, is the energy required to remove an electron from an isolated gaseous atom.
Correct answer: Ionization potential- A. Increases
- B. Decreases
- C. Remain same
- D. First decreases then increases
Explanation: Atomic radius generally decreases from left to right across a period because the nuclear charge increases while added electrons enter the…
Correct answer: Decreases