What mass of CaCl2 (electrolyte) should be dissolved in 750. grams of water to obtain a freezing point of – 4.2°C?
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B. nuclear reactions could first occur.

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m

The answer is b. because when it leaves the bat, its bringing motion on where its going.