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Calculate the value of " x+y-z" here x,y...

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 `(sigma)` bonds in hydrogen phosphite ion respectively.

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The correct Answer is:
3

x=7, y=1, z=5
7+1-5=3
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