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How many numbers of lone pairs of electrons around the centeral atom does SO2 have? Which of the following is the equation of the parabola having vertex (-2,4) and passing through the point (1,1)? What was the hardest chemistry regents? Initially 0.50 mol of H2H and 0.50 mol Cl2O are placed in a 1.0 L container. Calculate the [HOCl] at equilibrium? How many times is the first digit 4 greater than the secind 4 in 2 454? in 46 481?in 426 847?