Hi... Could u guys help me to solve this question? thanks?

Question

Which of the following are TRUE regarding buffers? (Check all that apply):
A 60/40 mixture of 1M ammonia and 1M ammonium nitrate will make a buffer.
Buffers help keep the pOH constant.
Man-made buffers were first invented by Robert Boyle.
A buffer in chemistry is a machine used to polish shoes and equipment.
Buffers are often present in biological systems.
Buffers help keep the pH constant.
A 50/50 mixture of 1M acetic acid and 1M sodium hydroxide will make a buffer.
pH buffers are added to shampoos and other cosmetic products.
Buffers are a mixture of an acid and its conjugate base in roughly equal proportions.
A 50/50 mixture of 1M acetic acid and 1M sodium acetate will make a buffer.

Answer 1

I don't know about Robert Boyle inventing buffers, and the chemistry laboratory shoe buffer is what they call a "distractor" question (ie a stupid answer).
The penultimate question misses out the very important word "weak" when it refers to an acid and its conjugate base.
Otherwise they are all true.

Answer 2

a million.sixty 2 hours x is time for lion to eat y is time for leopard z is time for undergo First make certain the lion and leopard: xy/(x + y) (4 * 5)/(4 + 5) = 20/9 that is two hours 13 minutes (2.22 hrs) allow's call this importance 'a' now make certain interior the undergo: az/(a + z) 2.22 * 6/(2.22 + 6) = a million hour 37 minutes (a million.sixty 2 hrs)