Chemistry

Acids and Bases

594 Questions

Acids and bases questions cover the chemical properties, common examples, and theoretical concepts of acidic and basic substances. Topics include identifying proton acceptors, recognizing amphoteric substances, and knowing the sources of everyday organic acids. These foundational chemistry questions are common across SSC, banking, and railways examinations.

Acid and base propertiesOrganic acidsAmphoteric substancesProton donors and acceptorsChemical formulas

Acids and Bases Questions

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Bayer's reagent is

  1. $Br _{2}/CCl _{4}$
  2. Cold, dilute alkaline $KMnO _{4}$
  3. Acidified $KMnO _{4}$
  4. $O _{3}/Zn/H _{2}O$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bayer's reagent is defined as a cold, dilute, alkaline solution of potassium permanganate (KMnO4). It is used to test for unsaturation in organic compounds, where it turns from purple to brown.

Multiple choice reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

Which of the following acid is used in fire extinguishers?

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Oxalic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sulphuric acid is non flammable so soda acid is most common fire extinguisher. Carbon dioxide is liberated by the action of sulphuric acid on baking soda or sodium bicarbonate. This increases the percentage of carbon dioxide in air. Due to this the supply of air is cut off and fire is extinguished.

Multiple choice reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

Which of  the following acids is called the king of the acids?

  1. Acetic acid

  2. Phosphoric acid

  3. Oxalic acid

  4. Sulphuric acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sulphuric acid is diprotic acid and shows different properties depending upon its concentration. It is a strong acid and in concentrated form it has strong dehydrating and oxidising properties. It has large number of applications. In almost all industrial processes sulphuric acid is used,in production of lead acid batteries,production of fertilizers,in chemistry labs,petroleum refining and production of paper. So it is called as the king of all acids.

Multiple choice reactions of acids and bases properties of acids and bases acids, bases and salts acids and bases chemistry

The acid generally stored in batteries is :

  1. sulphuric acid

  2. nitric acid

  3. hydrochloric acid

  4. acetic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphuric acid develops voltage from the chemical reaction produced when two unlike materials such as the positive and negative plates are immersed in the electrolyte a solution of sulphuric acid and water. In typical lead-acid battery the voltage is approx. 2 volts per cell for a total of 12 volts.

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

According to recent views, which is the current representation of hydrated proton in aqueous solution?

  1. $H^{+}$
  2. $H _{9}O _{5}^{+}$
  3. $H _{9}O _{4}^{+}$
  4. $H _{3}O^+$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The hydrated proton is represented as $H _3O^+$. Hence, the correct option is $D$.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which is not a ketone body?

  1. Succinic acid

  2. Acetone

  3. Acetoacetic acid

  4. p-hydroxybutyric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemicals that the body makes when there is not enough insulin in the blood and it must break down fat instead of the sugar glucose for energy. The ketone bodies -- acetone,  acetoacetate, and beta-hydroxybutyrate -- are toxic acidic chemicals. They build up in the blood and then spill over into the urine. The body can also rid itself of acetone through the lungs. This gives the breath a fruity odor.

So, the correct option is 'Succinic acid'.

Multiple choice botany cell cycle difference between meiosis and mitosis division for growth and reproduction meiosis

A buffer is a mixture of 

  1. Weak acid and its salt with a strong base

  2. Strong acid and its salt with a strong base

  3. Weak acid and its salt with a weak base

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A buffer is a solution that resists a change in pH upon the addition of acidic or basic components. To effectively maintain a pH range, a buffer consists of a weak conjugate acid-base pair, meaning either a weak acid and its conjugate base, or a weak base and its conjugate acid. An acidic buffer solution is the one which has a pH less than 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts having a strong base. Thus the correct answer is option A.
Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Acid neutraliser present in mucus of saliva is

  1. Bicarbonate ion

  2. Thiocyanate

  3. Sodium acetate

  4. Sodium hydroxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Saliva contains bicarbonate ions, which act as a buffer to neutralize acids produced by bacteria or present in food, helping to maintain a neutral pH in the mouth and protect tooth enamel.

Multiple choice chemistry study of compounds a. hydrogen chloride laboratory method of preparation of hydrochloric acid physical and chemical properties and uses of hydrochloric acid hydrogen chloride: occurrence, preparation, purification and identification

The compound which does not have oxygen is :

  1. nitric acid

  2. sodium hydroxide

  3. hydrochloric acid

  4. acetic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitric acid $(HNO _3)$ has 3 oxygen atoms in its formula.

Sodium hydroxide $(NaOH)$ has 1 oxygen atom in its formula.
Acetic acid $(CH _3COOH)$ has 2 oxygen atoms in its formula.
Hydrochloric acid $(HCl)$ does not have oxygen atom in its formula.

Hence, option C is correct.

Multiple choice chemistry study of compounds a. hydrogen chloride laboratory method of preparation of hydrochloric acid physical and chemical properties and uses of hydrochloric acid hydrogen chloride: occurrence, preparation, purification and identification

Which of the following acid is used in fire extinguishers?

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Nitric acid

  4. Oxalic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soda-acid extinguisher uses the reaction between sodium bicarbonate solution and sulphuric acid to expel pressurized water onto a fire. The reaction takes place as follows :-

$2NaHCO _3+H _2SO _4 \rightarrow Na _2SO _4+2CO _2+2H _2O$
The $CO _2$ formed forces the water out of the discharge and hence the device must be held in upright position.
However, such extinguisher can't be used in case of fire caused due to electricity (as water is a good conductor of electricity) and fire caused due to oil or petrol (as the oil or petrol may float over water).
Thus, the correct answer is option (B).

Multiple choice chemistry study of compounds a. hydrogen chloride laboratory method of preparation of hydrochloric acid physical and chemical properties and uses of hydrochloric acid hydrogen chloride: occurrence, preparation, purification and identification

Which of the following is known as battery acid?

  1. $HCl$
  2. $H _2SO _4$
  3. $HNO _2$
  4. $H _2S$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sulfuric acid is one of the most important industrial chemicals. It serves as the electrolyte in the lead-acid storage battery commonly used in motor vehicles (acid for this use, containing about 33% $H _2SO _4$ and with specific gravity about 1.25, is often called battery acid).