All Free Chemistry MCQs with Answers

• A. CN-
• B. SO4-2
• C. CHO3-
• D. PO4-3

Explanation: CHO3- can act as a Bronsted acid and a Bronsted base. A Bronsted acid is a species that donates a proton (H+), while a Bronsted base is a…

• A. An electron pair
• B. Proton
• C. An electron
• D. Pair of proton

Explanation: By Bronsted-Lowery concecpt an acid is a substance which lose a proton.

• A. Mother liquor
• B. Filtrate
• C. Extract
• D. Molasses

Explanation: Molasses is indeed the residue left behind after the crystallization of sugar from concentrated sugar cane juice.

• A. C2H5OH
• B. H2CO3
• C. C6H5OH
• D. H3PO3

Explanation: Carbolic acid is indeed another name for phenol, and its chemical formula is C6H5OH.

• A. Picric acid
• B. o-Nitrophenol
• C. 1,3,5-Trinitrobenzene
• D. p-Nitrophenol

Explanation: When phenol is heated with concentrated nitric acid (HNO3), the product is not 1,3,5-trinitrobenzene.The reaction between phenol and…

• A. As a solvent
• B. As an anti-freezing agent
• C. As a substitute for petrol
• D. For denaturing of ethyl alcohol

Explanation: Methyl alcohol, commonly known as methanol, is not typically used as a substitute for petrol (gasoline) in most conventional automobile…

• A. Vegetable oil
• B. Coal tar
• C. Wood
• D. None of these

Explanation: Phenol was isolated by Runge from coal tar. Phenol was indeed isolated by Friedrich Ferdinand Runge from coal tar.

• A. Iodoform test
• B. Lucas test
• C. Benedict's test
• D. Tollen's test

Explanation: Ethanol and methanol can indeed be distinguished by the iodoform test.The iodoform test is a chemical test used to detect the presence of…

• A. Methanal
• B. Ethanal
• C. Propanal
• D. 2-Hexanone

Explanation: "2-hexanone has more surface area, which is why it has a high boiling point, as it has more bonds to be broken down.

• A. Phenol
• B. Alcohol
• C. Carboxylic acid
• D. Water

Explanation: Relative acidic strength of alcohol, phenol, water and carboxylic acid is as follows:Carboxylic Acids>Phenol>Water>Alcohols The acidic…

• A. C2H6
• B. C2H5Cl
• C. CH3−O−CH3
• D. C2H5OH

Explanation: Alcohols are readily soluble in water but solubility decreases in higher alcohols.

• A. CH3OH
• B. C2H5OH
• C. CH3−O−CH3
• D. C6H5OH

Explanation: Alcohols are readily soluble in water but solubility decreases in higher alcohols.

• A. As a solvent
• B. As an anti-freezing agent
• C. As a substitute for petrol
• D. For denaturing of ethyl alcohol

Explanation: Methanol is used as a solvent for fats oils, paints, varnishes. It isalso used as antifreeze in the radiators of automobiles and…

• A. 80%
• B. 85%
• C. 90%
• D. 95%

Explanation: Alcohol obtained by fermentation is only upto 12% and never exceeds14% because beyond this limit enzymes become inactive.

• A. Carbolic acid
• B. H2O
• C. Methanol
• D. Butanoic acid

Explanation: OPTION A: Carbolic acid is a weak organic acid with a pKa of around 10.

• A. Carbonic acid
• B. Carbolic acid
• C. Acetic acid
• D. Hydroxy acid

Explanation: Option A: Carbonic acid is a carbon-containing compound that has the chemical formula H2CO3.

• A. Butyl alcohol
• B. Glycol
• C. Glycerol
• D. Propyl alcohol

Explanation: The common name of 1, 2, 3-propanetriol is glycerol. Glycerol is a trihydroxy alcohol commonly used in various industries, including food…

• A. O2
• B. H2
• C. [O] (nascent oxygen)
• D. H

Explanation: In the reaction, the dichromate ion is reduced and generates nascent oxygen ([O]), a highly reactive single atom of oxygen responsible for…

• A. Me-O-Me
• B. Et-O-Et
• C. iPr-O-iPr
• D. All of them

Explanation: Peroxide formation involves radicals as intermediate. So, that ether would readily form peroxide which forms more stable radical.

• A. CH3CHCH3
• B. CH3-CH-CH3
• C. CH3CH2CH2-
• D. CH3CH2CH2+

Explanation: Dehydration of alcohols proceeds by carbocation intermediate. A primary alcohol initially gives a primary carbocation, which rearranges to…