Free Periodic Properties and Trends MCQs with Answers
606 Periodic Properties and Trends MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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606 questions · page 7 of 31
- A. Number of valence electrons
- B. Atomic number
- C. Atomic mass
- D. Atomic volume
Explanation: Elements in the same vertical group generally have the same number of valence electrons, especially in the main-group elements, giving…
Correct answer: Number of valence electrons- A. nitrogenous fertilizers
- B. micronutrients
- C. phosphorus fertilizer
- D. all of the above
Explanation: Elements needed by plants in very small quantities, such as iron, zinc, copper and manganese, are called micronutrients.
Correct answer: micronutrients- 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