36.0 g of ‘A’ (Molar mass : 60 g and 56.0 g of ‘B’ (Molar mass : 80 g are allowed to react. Which of the following statements are correct ? A. ‘A’ is the limiting reagent. B. 77.0 g of AB? is formed. C. Molar mass of AB? is 140 g D. 15.0 g of A is lef

Question

$A + 2 B ⟶ A B_{2}$

36.0 g of ‘A’ (Molar mass : 60 g $m o l ⁻ ¹)$ and 56.0 g of ‘B’ (Molar mass : 80 g $m o l ⁻ ¹)$ are allowed to react. Which of the following statements are correct ?

A. ‘A’ is the limiting reagent.
B. 77.0 g of $A B_{2}$ is formed.
C. Molar mass of $A B_{2}$ is 140 g $m o l ⁻ ¹ .$
D. 15.0 g of A is left unreacted after the completion of reaction.

Choose the correct answer from the options given below : [2026]

Smart Achievers · Accepted Answer

(1)

$\begin{matrix} A & + & 2 B & ⟶ & A B_{2} \\ Mole & \frac{36}{60} & \frac{56}{80} \\ 0.6 mole & 0.7 mole \\ 0.25 mole & - & 0.35 mole \end{matrix}$

$(A) Molecular wt. of A B_{2} is$

$60 + 2 \times 80 = 220 g/mol$

$(B) LR is A B .$

$(C) Wt. of A remaining = 0.25 \times 60 = 15 g$

$(D) Wt. of A B_{2} formed = 0.35 \times 220 = 77 g$

Solution

1 B and D Only

2 A and B Only

3 A and C Only

4 C and D Only

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