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 3 of 31
- 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- A. HF
- B. HCI
- C. HBr
- D. HI
Explanation: HF is the weakest acid in water among these hydrogen halides because the H-F bond is exceptionally strong and does not break readily.
Correct answer: HF- A. pale yellow
- B. freenish yellow
- C. reddish brown
- D. grayish black
Explanation: Chlorine gas appears greenish yellow because it absorbs some wavelengths of visible light while transmitting and reflecting the…
Correct answer: freenish yellow- A. Cl2O7
- B. Cl2O6
- C. ClO2
- D. all
Explanation: ClO2 has an odd number of valence electrons, so one electron remains unpaired, making it paramagnetic.
Correct answer: ClO2- A. Cl2 is the strongest oxidizing agent
- B. I2 is a volatile solid
- C. Br2 is more reactive than Cl2
- D. Cl2 is insoluble in water
Explanation: Iodine is a volatile solid because its relatively weak intermolecular forces allow it to sublime readily on warming.
Correct answer: I2 is a volatile solid- A. AgNO3
- B. AgI
- C. AgCl
- D. AgBr
Explanation: Photographic plates traditionally contain silver bromide, AgBr, in a light-sensitive coating.
Correct answer: AgBr- A. SbF3 is used for manufacture of pottery
- B. Sodium fluoroacetate is a rat poison
- C. Cu F2 is used in ceramic industry
- D. None of the above
Explanation: All three listed fluorine compounds have recognized uses: antimony(III) fluoride is used in pottery-related work, sodium fluoroacetate is…
Correct answer: None of the above- A. Cotton
- B. Costly fabrics
- C. Linen
- D. Paper pulb
Explanation: Bleaching powder releases chlorine or hypochlorous acid, which oxidizes coloured substances but can damage delicate or costly fabrics.
Correct answer: Costly fabrics- A. NaCLO
- B. NaClO2
- C. NaClO3
- D. NaClO4
Explanation: Sodium hypochlorite contains the hypochlorite ion, ClO−, so its formula is NaClO. The oxyanion charge is balanced by one Na+ ion.
Correct answer: NaCLO- A. Flourine
- B. Chlorine
- C. Iodine
- D. Bromine
Explanation: Fluorine is the strongest oxidizing halogen, so it can oxidize and displace chloride, bromide and iodide ions from their compounds.
Correct answer: Flourine- A. Displacement reaction
- B. Double displacement reaction
- C. Disproportionation reaction
- D. Reduction reaction
Explanation: In 3Cl2 + 6NaOH → NaClO3 + 5NaCl + 3H2O, chlorine starts at oxidation state 0 and is simultaneously reduced to -1 in NaCl and oxidized to…
Correct answer: Disproportionation reaction- A. Cl2O
- B. ClO2
- C. Cl2O6
- D. Cl2O7
Explanation: In acidic solution, chlorate ion is reduced to chlorine dioxide, so balancing chlorine atoms gives 2 KClO3 producing 2 ClO2.
Correct answer: ClO2- A. Iodine solution
- B. Chlorine
- C. NaCl
- D. Ki
Explanation: Chlorine is more reactive than bromine and oxidises bromide ions: Cl2 + 2KBr -> 2KCl + Br2.
Correct answer: Chlorine- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Iodine
Explanation: Chlorine has the highest electron affinity among the halogens because its larger atomic size allows an incoming electron to enter with…
Correct answer: Chlorine- A. F2
- B. Cl2
- C. Br2
- D. I2
Explanation: Chlorine reacts directly with gold to form gold(III) chloride: 2Au + 3Cl2 -> 2AuCl3.
Correct answer: Cl2- A. F2
- B. Cl2
- C. Br2
- D. I2Cleaning Agents
Explanation: F2 is the strongest oxidising agent because fluorine has the greatest tendency to gain electrons and its reduction to F- is highly…
Correct answer: F2- A. F2
- B. Cl2
- C. Br2
- D. I2
Explanation: Van der Waals forces increase from F2 to I2 because the electron cloud becomes larger and more easily polarised, producing stronger…
Correct answer: I2- A. Fluorine
- B. Chlorine
- C. Astatine
- D. Iodine
Explanation: Astatine is the rarest naturally occurring halogen because it is radioactive and has no long-lived stable isotope, so only trace amounts…
Correct answer: Astatine- A. Alkali
- B. Acid
- C. Water
- D. Metals
Explanation: Oxygen reacts with many metals to form metal oxides, for example 2Mg + O2 -> 2MgO.
Correct answer: Metals