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S Block Elements question

2023 · 8 Apr · Shift 2 · Q7
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S Block Elements question

2023 · 8 Apr · Shift 2 · Q7

JEE MainChemistryS Block ElementsMCQ+4 / −1
For a good quality cement, the ratio of lime to the total of the oxides of Si,Al\mathrm{Si}, \mathrm{Al}Si,Al and Fe\mathrm{Fe}Fe should be as close as to :
  1. A
    3
  2. B
    2
  3. C
    1
  4. D
    4
View written solutionFree

Correct answer: B

  1. In good quality cement, the composition is controlled by the lime saturation factor, i.e. the ratio of lime to the acidic oxides.

  2. The relevant ratio is:

lime (CaO)SiO2+Al2O3+Fe2O3\frac{\text{lime }(\mathrm{CaO})}{\mathrm{SiO_2}+\mathrm{Al_2O_3}+\mathrm{Fe_2O_3}}SiO2​+Al2​O3​+Fe2​O3​lime (CaO)​

  1. For good quality cement, this ratio should be approximately 2.

  2. Therefore, among the given options:

  • A: 333 ❌
  • B: 222 ✅
  • C: 111 ❌
  • D: 444 ❌

Hence, the correct answer is Option B.