Chemistry

Solutions and pH Chemistry

451 Questions

Solutions and pH chemistry focus on the acidity or alkalinity of various substances, from human urine to acidic soils. Questions involve titration calculations, molarity determination, and understanding mole fractions. This topic is a staple in the chemistry sections of state and national level competitive exams.

Calculating solution molarityMole fraction calculationpH value interpretationAcidic soils and pHTitration and neutralization

Solutions and pH Chemistry Questions

Multiple choice redox and stoichiometry applications of redox reaction oxidation- reduction reactions redox reactions chemistry

0.2 g of a sample of $
{\text{H}} _{\text{2}} {\text{O}} _{\text{2}}
$ required 10 mL of 1 N $
{\text{KMnO}} _{\text{4}}
$ in a titration in the presence of $
{\text{H}} _{\text{2}} {\text{SO}} _{\text{4}}
$. Purity of $
{\text{H}} _{\text{2}} {\text{O}} _{\text{2}}
$ is:

  1. 25%

  2. 85%

  3. 65%

  4. 95%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

b'

In 0.2 g of a sample of  H2O2,

Let \'\'x\'\' gm of pure H2O2 is present, then

Equivalents of H2O2 = Equivalents of KMnO4

Moles of H2O2 X V.F of H2O2 = moles of KMnO4 X V.F of KMnO4

  = Molarity x volume x V.F of KMnO4

 = Normality x V.F of KMnO4   [N =M. V.F]

   Thus,

(x/34) x 2 = 1 x 10/1000

X/17 = 1/100

x = 17/100

x = 0.17.

Thus Pure H2O2 in 0.2 gm sample is =0.17/0.2 x 100

= 85 %

Hence Option “B” is correct answer.

'

Multiple choice action of alkalis on some metals and metal oxides analytical chemistry properties of acids and bases acids, bases and salts chemistry

If the pH of an alkali metal hydroxide is 13.6, the concentration of hydroxide is ;

  1. More than 1 M

  2. Between 0.1 M and 1 M

  3. Between 0.01 M and 1 M

  4. Less than 0.001 M
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Given that :

$pH = 13.6$

Thus, $pOH = 14 - 13.6$

                     $=0.4$
Hence,
$[O{H^ - }] = lo{g^{ - 1}}( - 0.4)$

               $ = 0.3979$

Therefore the value of $[O{H^ - }]$ is between $0.1M$ and $1M$.

Therefore, the option is B.

Multiple choice chemistry chemical reactions of organic compounds uses of alcohols commercially important alcohols - ethanol some commercially important alcohols commercially important alcohols - methanol methanol

Write the balanced equation for the following :-
Bromoethane and an aqueous solution of sodium hydroxide.

  1. $C _2H _5Br+NaOH\rightarrow C _2H _6$
  2. $C _2H _5Br+NaOH\rightarrow C _2H _5OH$
  3. $C _2H _5Br+NaOH\rightarrow C _2H _4O$
  4. $C _2H _5Br+NaOH\rightarrow C _2H _2O$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reaction:
$C _2H _5Br+NaOH\rightarrow C _2H _5OH$

Multiple choice chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

Vinegar is a :

  1. 5-8% solution of acetic acid in water

  2. 25-30% solution of acetic acid in water

  3. 40-45% solution of acetic acid in water

  4. 45-50% solution of acetic acid in water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vinegar is a liquid containing acetic acid and water. This acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient. It is a 5-8% solution of acetic acid in water and most easily available mild acid.