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 9 of 68
- A. Ionization energy
- B. Electron affinity
- C. Electro negativity
- D. Atomic size
Explanation: Electronegativity is a relative scale for an atom’s tendency to attract bonding electrons, so it is not an absolute measurable property.
Correct answer: Electro negativity- A. Generally increases from left to right in a period
- B. Does not change in a period
- C. Increase from top to bottom in a group
- D. Does not change in a group
Explanation: Ionization energy generally increases from left to right across a period because effective nuclear charge increases and the outer electron…
Correct answer: Generally increases from left to right in a period- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. CI > 1
Explanation: Atomic size generally increases down a group because additional electron shells are added.
Correct answer: Ba > Mg- A. White
- B. Redox potential
- C. Black
- D. Violet
Explanation: White phosphorus exists as discrete P4 molecules with considerable ring strain, making it chemically more reactive than the polymeric red…
Correct answer: White- A. Aluminium
- B. Sodium
- C. Carbon
- D. Sulphur
Explanation: Sodium is a metal, so its delocalised electrons allow it to conduct electricity, and its melting point is about 97.8 °C, just below 100…
Correct answer: Sodium- A. H2SO4
- B. HNO3
- C. both A and B
- D. none of the above
Explanation: Sulfur dioxide and nitrogen oxides dissolve in atmospheric water and form sulfuric acid, H2SO4, and nitric acid, HNO3, respectively.
Correct answer: both A and B- A. B
- B. C
- C. N
- D. O
Explanation: Nitrogen has the greatest first ionization energy among B, C, N and O because its 2p3 configuration has three singly occupied p orbitals…
Correct answer: N- A. aluminium can be recycled
- B. aluminium has very low density
- C. aluminium is the most abundant metal in the earth crust
- D. aluminium is resistant to corrosion by organic acids.Chemistry
Explanation: Aluminium rapidly forms a thin, adherent aluminium oxide film that protects the metal from further corrosion, making it suitable for…
Correct answer: aluminium is resistant to corrosion by organic acids.Chemistry- A. Carbon
- B. Arsenic
- C. Nitrogen
- D. Sulphur
Explanation: Carbon, arsenic and sulphur exist in different structural forms called allotropes, but nitrogen is normally found as N2 and is not…
Correct answer: Nitrogen- A. IIIA group
- B. IVA group
- C. VA group
- D. VIA group
Explanation: Across a short period, melting and boiling points generally rise as bonding becomes stronger, reaching a maximum at Group IVA because…
Correct answer: IVA group171. Which of the elements do not fall in stair case of the modern periodic table__________________?
- A. Si
- B. As
- C. Te
- D. None of the above
Explanation: Silicon, arsenic and tellurium all lie on or form part of the staircase boundary between metals and non-metals in the modern periodic…
Correct answer: None of the above- A. Uni-negative
- B. Uni-positive
- C. Di-negative
- D. Di-positive
Explanation: Formation of a uni-negative ion involves adding one electron, and the first electron affinity of an atom is generally exothermic because…
Correct answer: Uni-negative- A. Relative abundance
- B. Average mass of element
- C. Number of isotopes
- D. Relative isotopic mass
Explanation: In a mass spectrum, isotopes of an element produce separate signals at different mass-to-charge values, so the number of peaks generally…
Correct answer: Number of isotopes- A. Atomic number
- B. Relative abundance
- C. Electronic configuration
- D. All of the above
Explanation: A mass spectrometer separates ions according to their mass-to-charge ratios and records their intensities, allowing the mass numbers and…
Correct answer: Relative abundance- A. 0.2m
- B. 0.2mm
- C. 0.2nm
- D. 0.2pm
Explanation: An atomic diameter is typically about 0.1 to 0.3 nm, so 0.2 nm is the appropriate order of magnitude.
Correct answer: 0.2nm- A. Light brown
- B. Light green
- C. Light Blue
- D. Light yellow
Explanation: Silver bromide forms a pale cream or light-yellow precipitate when bromide ions react with silver ions, so light yellow is the closest…
Correct answer: Light yellow- A. used as mordant in dyeing
- B. used in photography and medicines
- C. used in making green pigments
- D. All of these
Explanation: Silver nitrate is widely used in photography because light converts silver halides into metallic silver, and it is also used medicinally…
Correct answer: used in photography and medicines- A. Blue Stone
- B. Blue Vitriol
- C. Lunar Caustic
- D. Both A & B
Explanation: Silver nitrate is called lunar caustic because it is a corrosive silver salt that was historically associated with the moon and silver.
Correct answer: Lunar Caustic- A. AgNO
- B. AgNO2
- C. AgNO3
- D. AgNO4
Explanation: Silver forms Ag+ and nitrate is NO3−, so charge balance gives the formula AgNO3.
Correct answer: AgNO3- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine
Explanation: Chlorine is widely used as a bleaching agent because it forms hypochlorous acid in water, which releases reactive oxygen species that…
Correct answer: chlorine