Exams › JEE Advanced › Chemistry
Beryl is a cyclic silicate mineral whose formula can be written as Beₙ Al₂ Si₆ O₁₈. What is the value of n?
- 1
- 2
- 3
- 4
Correct answer: 3
Solution
For the formula to be neutral, the sum of cation charges must equal the total anion charge of the 18 oxide ions (-36). Solving 2n + 6 + 24 = 36 gives n = 3.
Related JEE Advanced Chemistry questions
- When carbonates from the s-block break down, a gas is released that is denser than air and extinguishes a burning splint. Identify the gas.
- What is the classification of Be2C and Al4C3 based on their chemical composition?
- When heated, magnesium nitrate and barium nitrate break down as follows: 2M(NO3)2 → heat → 2MO + 4NO2(g) + O2(g) (where M = Mg or Ba). Which statement is accurate regarding their decomposition behavior?
- Consider the following reactions of Group IA (alkali) metals with liquid ammonia: M + (x+y) NH3 -> [M(NH3)ₓ]+ + [e(NH3)_y]- [M(NH3)ₓ]+ + e-(in NH3) -> M-NH2(aq) + (1/2) H2(g) Which of the following statements about these solutions is INCORRECT?
- How many of the following elements give a characteristic flame test color: Li, Na, K, Be, Mg, Ca, Ba, Cs?
- Arrange the following carbonates in the correct increasing order of their thermal stability: BeCO3, MgCO3, CaCO3, K2CO3.
⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →