Calculate the value of "x + y - z" here, x, y and z are total number of non-bonded electron pair(s), pie() bond(s) and sigma bonds in hydrogen phosphite ion respectively.

Question

Calculate the value of "x + y - z" here, x, y and z are total number of non-bonded electron pair(s), pie($\pi$) bond(s) and sigma bonds in hydrogen phosphite ion respectively.

Prashant Kotian · Accepted Answer

Correct answer: 3 / HYDROGEN PHOSPHITE ION IS [HPO3]2-. X = 7 (LONE PAIRS), Y = 1 ($\PI$ BONDS), Z = 5 ($\SIGMA$ BONDS). X+Y-Z = 7+1-5 = 3. Step 1: Heating oxalic acid (H2C2O4) yields carbon monoxide (CO, gas A), carbon dioxide (CO2, gas B), and water (H2O, liquid C). CO burns with a blue flame and is oxidized to CO2. Step 2: Carbon monoxide (gas A) reacts with chlorine gas in the presence of sunlight to form phosgene (COCl2, compound D). Phosgene reacts with ammonia (NH3) under heating to form urea (NH2CONH2, compound E). Step 3: Therefore, the substances A, B, C, and E are CO, CO2, H2O, and NH2CONH2 respectively, which corresponds to option (c).

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