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 chemistry the p-block elements - group 13 study of orthoboric acid some important compounds of boron study of boron

Which of the following statements about $H _3BO _3$ is not correct?

  1. It is a strong tribasic acid

  2. It is prepared by acidifying an aqueous solution of borax

  3. It has a layer structure in which planar borate ions are joined by hydrogen bonding

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Boric acid, also called hydrogen borate is a weak, monobasic Lewis acid of boron. So it is not a strong tribasic acid. Remaning all options are correct

Hence option $A$ is correct.

Multiple choice chemistry the p-block elements - group 13 study of orthoboric acid some important compounds of boron study of boron

Which one of the following statements about $H _3BO _3$ is not correct?

  1. It is a strong tribasic acid

  2. It is a prepared by acidifying an aqueous solution of borax
  3. It has a layer structure in which planar $BO _3$ units are joined by hydrogen bonds

  4. It does not act as proton donor as it acts as a Lewis acid by accepting hydroxyl ions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is weak monoprotic acid and it does not act as proton donor but removes proton from water.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

Statement I: $HCl$ is considered to be an acid.

Statement II: $HCl$ is a proton donor.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An acid is a substance that can donate a hydrogen ion ($H^+$) or proton to another substance. $HCl$ can donate proton so it is a acid.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

Which of the following acids is capable of dissolving gold?

  1. Hydrochloric acid

  2. Nitric acid

  3. Sulfuric acid

  4. A combination of A and B

  5. A combination of A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aqua regia is a mixture of hydrochloric acid and nitric acid in the ration $3:1$. It is a very strong acid and can dissolve any metals including noble metals like gold and silver.

Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

The concentrated $HCl$ acid strongly fumes in_________.

  1. air

  2. water

  3. both

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Concentrated hydrochloric acid fumes in the air forming acidic mists. Both the mist and the solution have a corrosive effect on human tissue with the potential to damage respiratory organs, eyes, skin and intestines.

Multiple choice chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

$Ca(H _{2}PO _{4}) _{2}$ in baking powder:

  1. Behaves as an acid in moist condition and decomposes $NaHCO _{3}$ to give $CO _{2}$
  2. Behave as a base in moist condition and gives $H _{3}PO _{4}$

  3. Behaves as binder

  4. Behaves as a filler
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The baking powder consists of sodium bicarbonate and calcium dihydrogen phosphate.In this process the ${ H } _{ 2 }{ PO } _{ 4 }$ acts as acid in the baking powder and then reacts with ${ NaHCO } _{ 3 }$  so that carbon dioxide that expands in the food items.When sufficient heat is given bond will breaks between  $Ca$ and ${ H } _{ 2 }{ PO } _{ 4 }$ and then reacts with 

$NaHC{ O } _{ 34 }$ and the carbon dioxide will be formed.

Multiple choice chemistry substances in common use preparation, properties and uses of baking soda chemical from common salt compounds of carbon

The pair whose both species are used in antacid medicinal preparation is

  1. $NaHCO _3$ and $Mg(OH) _2 $
  2. $Na _2CO _3$ and $Ca(HCO _3) _2 $
  3. $Ca(HCO _3) _2$ and $Mg(OH) _2 $
  4. $Ca(OH) _2$ and $NaHCO _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Milk of magnesia is an aqueous suspension of magnesium hydroxide $[Mg(OH) _2]$ used to treat acid indigestion.
Also sodium bicarbonate is used for antacid medicinal preparation.

Multiple choice biology aids to health immunization, treatment and antibiotics antibodies and antitoxin prevention and treatment of disease

Benzoic acid in ---------- solution is a good antiseptic.

  1. Concentrated

  2. Dilute

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Antiseptics are mild or dilute chemical substances which when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), benzoic acid.

Multiple choice biology aids to health immunization, treatment and antibiotics antibodies and antitoxin prevention and treatment of disease

Benzoic acid in ............... solution are good antiseptics.

  1. Concentrated

  2. Dilute

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose. Dettol, savlon are all antiseptics.

So, the correct answer is 'Dilute'.