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 chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following is not amphoteric ?

  1. $HS{O _4}$
  2. ${H _2}P{O _2}$
  3. ${H _2}O$

  4. non of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HSO4- and H2PO2- are amphoteric. H2O is amphoteric. Since all options listed are amphoteric, the correct choice is that none of them are 'not amphoteric'.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Among the following which one has more acidic character?

  1. $B _{2}O _{3}$
  2. $CO _{2}$
  3. $N _{2}O _{3}$

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

$B _2O _3$ is more acidic than $CO _2$ and $N _2O _5$ because oxides of elements of 13th group of modern periodic table is more acidic than than 14th and 15th group elements.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

ABA is degraded into 

  1. Mallic acid

  2. Oxalic acid

  3. Phaseic acid

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Abscisic acid is also called stress hormone because the produc­tion of hormone is stimulated by drought, waterlogging, and other adverse environmental conditions. Abscisic acid is known as dormin as it induces dormancy in buds, underground stems, and seeds. ABA is degraded to phaseic acid via CYP707A (a group of P450 enzymes). 
So, the correct answer is 'Phaseic acid'.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Which of the following is used as chemical preservatives ?

  1. Citric acid

  2. Nitric acid

  3. Oxalic acid

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Citric acid and phosphoric acid are added to carbonated beverages and fruit drinks for both flavoring and preservation. Nitric acid and Oxalic acid are much acidic in nature which can cause harm to the digestion system.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Vinegar is ________.

  1. Acidic

  2. Basic

  3. Odourless

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Vinegar is an aqueous solution of acetic acid. Usually, the acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria. Vinegar is mildly acidic, with the pH of 2 to 3. The lower the pH, the more acidic the vinegar is. Though vinegar is acidic in nature, it is mainly used as a cooking ingredient, or in pickling. 

So, the correct answer is option A.
Multiple choice biology biotechnology and genetic engineering stds and infertility gm crops biotechnology

Bathe spruce and fir trees on mountains are more acidic than

  1. $SO _{2}$

  2. Lime juice

  3. Vinegar
  4. $NO _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The question is garbled and likely refers to acid rain affecting trees. Vinegar is a common acidic substance, but the comparison in the prompt is nonsensical. Given the options, vinegar is the most acidic substance listed.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

$-{ NH } _{ 2 }$ group shows acidic nature while reacts with this reagent:

  1. $Na$
  2. ${ CS } _{ 2 }$
  3. ${ Br } _{ 2 }+NaOH$

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

A compound shows acidic nature if the opposite atom or compound of the bond shows basic character. Sodium is a metal and it is basic in nature. $-NH _2$ shows acidic character when it reacts with sodium.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Acidic nature of amino group is shown by the reaction :-

  1. $R{ - }{ N }{ H } _{ 2\quad }+NOCL\longrightarrow RCI+{ N } _{ 2 }+{ H } _{ 2 }O$
  2. $2RN{ H } _{ 2 }+2Na\longrightarrow 2RNH.Na+{ N } _{ 2 }$
  3. $R.C{ H } _{ 2 }N{ H } _{ 2 }+HN{ O } _{ 2 }+{ N } _{ 2 }+{ H } _{ 2 }{ O }$
  4. $R.N{ H } _{ 2 }+HCL\longrightarrow RN{ H } _{ 3 }CL$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The acidic nature of the amino group (or more accurately, the hydrogen atoms attached to the nitrogen) can be demonstrated by reactions with strong bases or active metals like sodium, where the hydrogen is replaced.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Which of the following compounds are formed by the reaction of ammonia with acids?

  1. Calcium ammonium nitrate

  2. Ammonium chloride

  3. Ammonium phosphate

  4. Ammonium sulphate
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

$ { NH } _{ 3 }+{ HNO } _{ 3 }\longrightarrow { NH } _{ 4 }NO\ { NH } _{ 3 }+HCl\longrightarrow { NH } _{ 4 }Cl\ { NH } _{ 3 }+{ H } _{ 4 }{ PO } _{ 4 }\longrightarrow ({ { NH } _{ 4 }) } _{ 3 }{ PO } _{ 4 }\ { NH } _{ 3 }+{ H } _{ 2 }{ SO } _{ 4 }\longrightarrow { { (NH } _{ 4 }) } _{ 2 }{ PO } _{ 4 }\  $

All of the above in respective order. 

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Which of the following compounds are formed by the reaction of ammonia with acids?

  1. Calcium ammonium nitrate

  2. Ammonium chloride

  3. Ammonium phosphate

  4. Ammonium sulphate
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

$NH _3$ is a base and it forms salt with acids.
Ammonia reacts with Nitric acid to form ammonium nitrate and on further addition with Calcium carbonate it forms Calcium ammonium nitrate.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Formation of ammonium sulphate from ammonia and dil sulphuric acid is given by :

  1. ${3NH } _{ 3 }+{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { \left(2 { NH } _{ 4 } \right) } _{ 2 }{ SO } _{ 4 }$
  2. ${ 2NH } _{ 3 }+{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { \left( { NH } _{ 4 } \right) } _{ 2 }{ SO } _{ 4 }$
  3. ${ 2NH } _{ 3 }+3{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { \left( { NH } _{ 4 } \right) } _{ 2 }{ SO } _{ 4 }$
  4. ${ 2NH } _{ 3 }+2{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { \left( { NH } _{ 4 } \right) } _{ 2 }{ SO } _{ 4 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

${ 2NH } _{ 3 }+{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { \left( { NH } _{ 4 } \right)  } _{ 2 }{ SO } _{ 4 }$