66 gm sample of an oxalate salt ${Al}_{x} H_{y} {(C_{2} O_{4})}_{z} \cdot {nH}_{2} O$ is dissolved in water to form 500 mL solution. 50 mL solution requires 60 mL of 0.5 M $Ba {(OH)}_{2}$ and 240 mL 0.1 M ${KMnO}_{4}$ in acidic medium separately. If in salt x, y, z and n are present in simplest ratio then select the correct statement(s).

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Ratio of y / z is equal to 1

Number of oxalate ions per molecule of oxalate salt is 2

Moles of oxalate salt in original sample is 0.2

Value of (x + y + z) - n = 5

answer is A, B, C.

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Detailed Solution

Let moles of oxalate = n

$n \times y = \frac{60}{1000} \times 0 .5 \times 2 \times 10$

$n \times 2 z = 240 \times 0 .5 \times 10$

$\Rightarrow \frac{y}{z} = 1$

Also, $3 x + y = 2 z$

${Al}_{1} H_{3} {(C_{2} O_{4})}_{3} \cdot n H_{2} O$

Thus, correct options are A, B and C.

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