Strength of Acids and Bases

A student added a drop of universal indicator to $1.00$ mL of given solution and found that a green colour is produced. The $\mathrm{pH}$ value of the solution will be

The $\mathrm{pH}$ value of pure water is

The ${\mathrm{H}}^{+}$ ion concentration of a solution is $2\times {10}^{-8} \mathrm{mol} {\mathrm{L}}^{-1}$ . The pH value of the solution is ${\log }_{10} 2=0.3010$.

Digestive fluids in the stomach have approximate pH of 

The $\mathrm{pH}$ of acid rain is

The pH of the solution having hydrogen ion concentration$\left({\mathrm{H}}^{+}\right)=1\times {10}^{-4}\mathrm{mol}/\mathrm{lit}$ will be:

Given $\mathrm{pH}$ of a solution $\mathrm{A}$ is $3$ and it is mixed with another solution $\mathrm{B}$ having $\mathrm{pH}$ $2$. The resultant $\mathrm{pH}$ of the solution will be

$\mathrm{pH}$ is defined as

Which of the following is the strong a base:

pH of 0.001 M NaOH will be 

A milkman adds a very small amount of baking soda to fresh milk, why?

Tooth enamel contains 

A solution turns red litmus blue, its $\mathrm{pH}$ is likely to be 

$\mathrm{pH}$ is defined as 

Fresh milk has a $\mathrm{pH}$ of $6$. When milk changes into curd. The $\mathrm{pH}$ value will

The nature of calcium phosphate present in tooth enamel is

A solution turns red litmus into blue, its pH is likely to be

In certain solutions,

(i) moles of H⁺= moles of OH^-

(ii) pH < 7

(iii) pH = 7

(iv) moles of OH^- > moles of H⁺

Which of the above conditions refers to a neutral environment in standard conditions?

Self-ionisation equation of pure water is as follows.

$2H_{2}O\left(s\right)\rightleftharpoons H_3{O}^{+}+O{H}^{-}$

(i) Pure water is neutral.

(ii) The number of H₃O⁺(hydronium) ions is equal to the number of OH^-(hydroxide) ions.

(iii) Pure water ionises very little.

Which of these statements are correct?

In Figure - 1 and Figure - 2, equal moles of $HA$and $BOH$substances are added to the same volume of pure water at the same temperature. The equations for the solubility of these substances in water are given thereafter.

(i) The number of moles of $H^{+}$ vessel 1 equals the number of moles of $O{H}^{-}$ in vessel 2.

(ii) The electrical conductivity of $HA$(in water) is higher than that of $BOH$(in water).

(iii) The number of moles of $O{H}^{-}$ions in $HA$(water) is greater than the number of moles of $O{H}^{-}$ions in $BOH$(water).

Which of the statements out of $I, II, III$ are correct?