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Calculate the value of "x + y - z" here, x, y and z are total number of non-bonded electron pair(s),p Block Elements Chemistry Question

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.

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
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