$1-$In preparing the burette for titration the final rinse should be done by:

a$)$ NaOH solution

b$)$ Titrant

c$)$ Analyte

d$)$ Deionised water

$2-$The evidence of the reaction between NH$.$Cla and NaOH $($ag$)$ is:

a$)$ Temperature decreased

b$)$ Color change

d$)$ Change in odor

c$)$ Precipitate appear

$3-$ Aspirin is produced by the reaction of acetic anhydride with:

a$)$ Acetylsalicylic acid

c$)$ Acetic acid

b$)$ Sulfuric acid

d$)$ Salicylic neid

$4-$ If $10$ml of KOHlag was used to titrate $15$ml of $0\mathrm{.}1$M KHP solution the molar concentration ofKOH solution is:

a$)1\mathrm{.}5$M

c$)0\mathrm{.}15$M

b$)15*10^-3$ M

d$)0\mathrm{.}67$M