JEE Main 2026 — Jan 21, Shift 1 — Chemistry solution

JEE Main2026Jan 21, Shift 1Chemistry

14.0 g of calcium metal is allowed to react with excess $H C l$ at 1.0 atm pressure and 273 K. Which of the following statements is incorrect?

[Given: Molar mass in g mol $^{- 1}$ of Ca−40, Cl−35.5, H−1]

Solution

$C a + 2 H C l \to C a C l_{2} + H_{2}$ . Moles of Ca $= 14/40 = 0.35$ mol.

Moles of $H_{2}$ evolved $= 0.35$ mol $\Rightarrow$ volume at STP $= 0.35 \times 22.4 = 7.84$ L. (1) and (2) correct.

$C a C l_{2}$ produced $= 0.35 \times 111 = 38.85$ g, not 33.3 g. Statement (3) is incorrect.

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