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 s-block elements (alkali and alkaline earth metals) uses of alkali and alkaline earth metals uses of s block elements group 1 elements: alkali metals

The common name, "cream of tartar" refers to :

  1. $KHC _{4}H _{4}O _{6}$
  2. $K(SbO)C _{4}H _{4}O _{6}$
  3. $KNaC _{4}H _{4}O _{6}$
  4. $Mg _{2} (OH) _{2}(C _{4}H _{4}O _{6})H _{2}O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cream of tartar : Potassium bitartrate(potassium hydrogen tartrate) $KHC _4H _4O _6$

Multiple choice chemistry organic nitrogen compounds nitroarenes- preparation and properties nitro compounds types of organic reactions

A compound X of formula $\displaystyle C _{2}H _{5}NO _{2}$ on treatment with $\displaystyle (HNO _{2}+HCl)$ gives off an inactive gas Y and form Z when heated with soda lime X gives A $\displaystyle (CH _{5}N)$ soluble in acid Find the true statements among the following.

  1. A answers carbylamine test

  2. X is an amino acid
  3. Y is $\displaystyle CO _{2}$

  4. Z is a hydroxyl acid
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

A major constituent of vinegar is:

  1. Methanoic acic

  2. Benzoic acid

  3. Ethanoic acid

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

The main constituent of vinegar is acetic acid. The other constituents will depend on the nature of the raw material that has undergone fermentation.

Hence, option $C$ is correct.

Multiple choice chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

Among the following compounds, the most acidic is:

  1. p-nitrophenol

  2. o-hydroxybenzoic acid

  3. p-toluic acid

  4. p-hydroxybenzoic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Order of strength is ortho hydroxy benzoic acid > Toulic acid > p-hydroxy benzoic acid > p nitro phenol. Ortho hydroxy acid is strongest acid due to stabilisation conjugate by intermolecular H-bond which outweigh the electron donating resonance effect of –OH

 

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

The organic acid present in vinegar is :

  1. methanoic acid

  2. ethanoic acid

  3. propanoic acid

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

Vinegar is also known as acetic acid and water. Acetic acid is ethanoic acid produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is a cooking ingredient and commercially produced by fast or slow fermentation processes. 

Multiple choice chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

The acidic strength of methoxyphenols are in order

  1. Para > Ortho > Meta > Phenol

  2. Para > Ortho > Phenol > Meta

  3. Meta > Phenol > Ortho > Para

  4. Meta > Phenol > Para > Ortho
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The acidity of methoxyphenols is influenced by the inductive and resonance effects of the methoxy group. The para-isomer is most acidic due to resonance stabilization, followed by ortho (due to proximity), then phenol, and meta is least acidic.

Multiple choice chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

Which of the following anions neutralize the acidic pH of the chime that enters into the duodenum from the stomach?

  1. $H _2PO^- _4$
  2. $HSO^- _4$
  3. $HCO^- _3$
  4. $CH _3COO^-$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$HCO _3$ which is produced by the duct cells helps in neutralizing the acidic chime. It creates an optimum pH for the digestive enzymes in the duodenum.

Multiple choice evs - i constituents of food simple test for nutrients test for nutrients protein and its function nutrients and foodstuffs

Select the correct option:

Acidic amino acids have two $-COOH $ groups and one $-NH _2$ group per molecule. Select the pair that consists of acidic amino acids. 

  1. Aspartic acid, glutamic acid

  2. Lysine, arginine

  3. Glycine, alanine

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An amino acid is the structural and functional unit of protein and are made up of carbon, hydrogen, oxygen, nitrogen and sometimes sulphur. These are organic acids with a carboxyl group and one amino group.  Amino acid acts as a buffer. 

Based on the groups that are present on the side chain of amino acid they are divided into various categories. 
Acidic amino acids are the ones that have a carboxyl group in their side chain for example aspartic acid and glutamic acid.
Basic amino acids are the ones that have a basic group and NH2 in their side chain; for example lysine and arginine.
Simple amino acids are the ones that do not have any functional group in their side chain; for example glycine, valine and alanine.

So, the correct option is 'Aspartic acid, glutamic acid'

Multiple choice pseudo first order reaction order of reactions chemical kinetics electrochemistry and chemical kinetics chemistry

The acid hydroylsis of ester is:

  1. first order reaction

  2. bimolecular reaction

  3. pseudo unimolecular reaction

  4. none of the above
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The acid hydrolysis of ester is a first-order reaction, bimolecular reaction and pseudo unimolecular reaction.


When an ester (such as ethyl acetate) is mixed with water it is converted into alcohol and acid according to the following equation: 

$CH _3COOC _2H _5 + H _2O \rightarrow CH _3COOH + C _2H _5OH$

When the amount of water is relatively large, the reaction goes practically to completion (the equilibrium shifts to the right) and the rate is first order with respect to the ester. The hydrolysis takes place slowly with pure water and is catalyzed by acids.

Hence, options A, B and C are correct.

Multiple choice bio-chemistry biological oxidation classical idea of redox reactions oxidation reduction redox reaction

Oxalic acid dihydrate, $H _{2}C _{2}O _{4}\cdot 2H _{2}O(s)$ is often used as a primary reagent to standardise sodium hydroxide solution. Which of these facts are reasons to choose this substance as a primary standard?
I. It is diprotic.
II. It is a stable compound that can be weighed directly in air.
III. It is available in pure form.

  1. III only

  2. I and II only

  3. II and III only

  4. I, II and III
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\begin{array}{l} { H _{ 2 } }{ C _{ 2 } }{ O _{ 4 } }\cdot 2{ H _{ 2 } }O\left( s \right) \to oxadic\, acid\, dihydrate\,  \ Since,\, it\, is\, very\, stable\, and\, also\, available\, in\, pressure \ from\, in\, the\, laboratory\, i.e.\, it's\, always\, used\, as\, primary\, s\tan  dard\, in\, the\, lab. \ Hence,\, the\, option\, C\, is\, the\, correct\, answer. \end{array}$

Multiple choice hydrogen ion scale or the ph scale inorganic analysis chemical analysis and investigation practical work chemistry

What is pH?

  1. Used in identification of cations

  2. Identification of non metals

  3. Specify the acidity or basicity of an aqueous solution
  4. Both $A$ and $C$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$pH$ is a numeric scale used to specify the acidity or basicity of an aqueous solution. It is roughly the negative of the logarithm to base 10 of the concentration, measured in units of moles per liter, of hydrogen ions or $H^+$.