Exams › JEE Advanced › Chemistry

Arrange the alkaline earth metal hydroxides in the correct order of increasing thermal stability.

1. Ba(OH)2 < Sr(OH)2 < Ca(OH)2 < Mg(OH)2
2. Mg(OH)2 < Sr(OH)2 < Ca(OH)2 < Ba(OH)2
3. Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2
4. Ba(OH)2 < Ca(OH)2 < Sr(OH)2 < Mg(OH)2

Correct answer: Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2

Solution

On descending Group 2, cation size increases and the hydroxides become more thermally stable, so the order of increasing stability is Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2.

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 →