The lower the ph of a solution, the a. greater the number of oxygen atoms b. more acidic the solution c. less toxic the solution d. higher the oh— concentration

b.more acidic the solution

Explanation:

pH is the measure of acidity or alkalinity of a solution.  Acids are substances which gives ions when dissolved in water.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Thus as pH and are inversely related, a solution having lower pH will have more amount of concentration , a lower amount of concentration and will be more acidic.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)