Consider the following oxyanions : PO4^3-, P2O7^4-, MnO4^-, CrO4^2-, S2O5^2-, S2O7^2- and find the value of R + Q - P. Where
P = Number of oxy anions having three equivalent X - O bonds per central

Question

Consider the following oxyanions : PO4^3-, P2O7^4-, MnO4^-, CrO4^2-, S2O5^2-, S2O7^2- and find the value of R + Q - P. Where
P = Number of oxy anions having three equivalent X - O bonds per central atom
Q = Number of oxy anions having two equivalent X - O bonds per central atom
R = Number of oxy anions having four equivalent X - O bonds per central atom

Prashant Kotian · Accepted Answer

Correct answer: 2

**SOLUTION:**
R = 3 (PO4^3-, MNO4^-, CRO4^2-)
P = 3 (P2O7^4-, S2O5^2-, S2O7^2-)
Q = 2 (S2O5^2-)
R + Q - P = 3 + 2 - 3 = 2.. Step 1: Ice has an open cage-like hexagonal structure with a large amount of empty space due to highly organized, rigid intermolecular hydrogen bonds. Step 2: Upon melting, the thermal energy partially disrupts this rigid hydrogen-bonded network. Step 3: This collapse of the cage structure allows the water molecules to pack more closely together, resulting in a volume contraction. This matches option (b).

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