Refer to aqueous solutions containing 1:1 mole ratios of the following pairs of substances. Assume all concentrations are 1 M.
Which solution has the lowest pH?

a) NH3 and NH4Cl
b) H3PO4 and NaH2PO4
c) HCl and NaCl
d) NaOH and NH3
e) NH2 and HC2H3O2 (acetic acid)

HCl and NaCl option c

Explanation:

 According to the pH scale interpretation a lower pH means that its is more acidic, while a higher pH means that it is more basic.

Simply put a pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

From the question above c fits in the option with the lower pH meaning its a strong acid and it tends more towards 0 than 7.

A solution, containing a buffer, is one that maintains a relatively constant pH.

NH3 and NH4Cl ;H3PO4 and NaH2PO4 are an acid/base conjugate pair each. They will make an excellent buffer.

NaOH and NH3 would rather make a slightly basic mixture

NH2 and HC2H3O2 (acetic acid) slightly basic mixture ..

Solution c has the lowest pH.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.