Acids, Bases and Salts

Which one of the following is the correct order of $\mathrm{pH}$ for the given substances?

Consider the following statements :

While diluting concentrated nitric acid solution

$1.$ The concentration of $\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]$ ions/ volume increases

$2.$ Water must be added slowly to concentrated acid.

$3.$ Acid must be added slowly to water.

Which of the statements given above is/are correct?

Which one of the following pairs of enzymes do not work acidic $\mathrm{pH}$ ?

Milk of Magnesia is used when people suffer from indigestion of food. It is a _____. 

Stinging hair of nettle leaves inject fluid in the human body causing burning pain. The fluid is _____. 

Which of the following acids is used in the purification of gold and silver? 

The compound that is not a Lewis acid is:

“An acid is a proton donor”. This theory was given by

A buffer solution can be prepared by mixing equal volumes of

Among the following, the correct statement is

The weakest base among the following species is ________

Three reactions involving ${\mathrm{H}}_2{{\mathrm{PO}}_4}^{-}$ are given below :

(i)  ${\mathrm{H}}_3{\mathrm{PO}}_4 +{\mathrm{H}}_2\mathrm{O} \to {\mathrm{H}}_3{\mathrm{O}}^{+} + {\mathrm{H}}_2{{\mathrm{PO}}_4}^{-}$

(ii) ${\mathrm{H}}_2{{\mathrm{PO}}_4}^{-} +{\mathrm{H}}_2\mathrm{O} \to {{\mathrm{HPO}}_4}^{2-} +{\mathrm{H}}_3{\mathrm{O}}^{+}$

(iii) ${\mathrm{H}}_2{{\mathrm{PO}}_4}^{-} +{\mathrm{OH}}^{-} \to {\mathrm{H}}_3{\mathrm{PO}}_4 + {\mathrm{O}}^{2-}$

The $\mathrm{pH}$ of $100 \mathrm{mL}$ of $0.10 \mathrm{M}$ $\mathrm{NaOH}$ mixed with $100 \mathrm{mL}$ $0.10 \mathrm{M}$ ${\mathrm{CH}}_3\mathrm{COOH}$ solution is

Identify the buffer solution among the following.

What will be the $\mathrm{pH}$ of resultant mixture when $20\mathrm{ml}$ of $0.1\mathrm{M}{\mathrm{H}}_2{\mathrm{SO}}_4$ solution is added to $30\mathrm{mL}$ of $0.2\mathrm{M}{\mathrm{NH}}_4\mathrm{OH}$ solution ?

Given:- $\left[{\mathrm{pk}}_{\mathrm{b}}\mathrm{ }\mathrm{of}\mathrm{ }{\mathrm{NH}}_4\mathrm{OH}=4.7\right]$

Among the following, which is/are correct?

Among the following, which can act as a Lewis acid?

Which of the following is possible acid base reaction?

Among the following, aluminium chloride is.

Among the given molecules, which one will act as a Lewis acid?