All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 583 of 686
- A. Destructive distillation
- B. Fractional distillation
- C. Vacuum distillation
- D. Dry distillation
Explanation: Fractional distillation is the industrial process used to separate crude oil into its various components, or fractions.
Correct answer: Fractional distillation- A. C10H22
- B. CH3CHO
- C. CHCl3
- D. CH3CH2OH
Explanation: C10H22 is non-polar organic compound. In fact, it is example of alkane. Its name is decane.
Correct answer: C10H22- A. They have low boiling points
- B. They are more soluble in non-polar solvent
- C. They show polymorphism and isomorphism
- D. They are flammable
Explanation: Organic compounds do not show the property of polymorphism and isomorphism. The show the property of isomerism.
Correct answer: They show polymorphism and isomorphism- A. CnH2n
- B. CnH2n-2
- C. CnH2n+2
- D. C2H20-4
Explanation: CnH2n+2 is valid only in case of saturated open chain hydrocarbons
Correct answer: CnH2n+2- A. Number of carbon atom
- B. Number of hydroxyl group
- C. Position of hydroxyl group
- D. All of these
Explanation: Glycol has 2 hydroxyl groups attached to two different carbon atoma while glycerol has 3 hydroxyl groups attached to 3 different carbons.
Correct answer: All of these- A. 3-Ethyl 2-methyl hexane
- B. Iso propyl hexane
- C. 4-Ethyl 5-methyl hexane
- D. 3-Ethyl,2,3-Dimethylhexane
Explanation: If we start counting from immediate right end of the chain then, there are two methyl groups on carbon 2 and 3, also a ethyl group on…
Correct answer: 3-Ethyl,2,3-Dimethylhexane- A. They have low boiling points.
- B. They are more soluble in non-polar solvent.
- C. They show polymorphism and isomorphism.
- D. They are inflammable.
Explanation: While polymorphism and isomorphism are less common in organic compounds compared to inorganic compounds, it's challenging to make a…
Correct answer: They show polymorphism and isomorphism.- A. R3C+
- B. CH+3
- C. R2CH+
- D. RCH2+
Explanation: Alkyl groups are electron donating groups. They increase the stability of carbocation.
Correct answer: CH+3- A. High boiling points
- B. High melting points
- C. Low melting points
- D. Low vapour pressure
Explanation: Yes, that statement is correct. Organic compounds that exhibit weak attractive forces, such as London dispersion forces (Van der Waals…
Correct answer: Low melting points- A. (Cn H2n+2) O
- B. (Cn + H2n+1) CO
- C. C2 H2n+1 CHO
- D. (Cn H2n+1 COOCn H2n+1)
Explanation: The correct option is A aas the general formula for Ether is (Cn H2n+2) O .
Correct answer: (Cn H2n+2) O- A. Decrease boiling point
- B. Prevent heating
- C. Prevent freezing ors fuel
- D. Prevent knocking
Explanation: The octane number of a poor fuel can also be improved by blending it with a small amount of additive like tetraethyl lead (TEL).
Correct answer: Prevent knocking- A. Pyridine
- B. Pyrrole
- C. Phenol
- D. Piperidine
Explanation: Pyridine is heterocyclic compound in which contain N in carbon ring.
Correct answer: Piperidine- A. Sp
- B. Sp³
- C. Sp²
- D. dsp
Explanation: The orbitals that undergo sp hybridization have a linear shape with a bond angle of 180
Correct answer: Sp- A. CH3CH2OH
- B. CH3OCH3
- C. CH3COOH
- D. CH3CH2Br
Explanation: The compound a is an alcohol due to the presence of OH functional group.
Correct answer: CH3CH2OH- A. Sp³
- B. Sp²
- C. Sp
- D. dsp³
Explanation: The hybridization of carbon atoms in ethane is SP3. This is because each carbon atom in ethane forms four covalent bonds, which require…
Correct answer: Sp³- A. Two hydrogen atom
- B. Three hydrogen atom
- C. One hydrogen atom
- D. No hydrogen atom
Explanation: In t butyl alcohol the central carbon atom is attached directly to three C atom hence it is not in contact with any H atom thus this…
Correct answer: No hydrogen atom- A. Option A: 1-butene is a linear hydrocarbon.
- B. Option B: Cyclohexene is an alicyclic hydrocarbon.
- C. Option C: Toluene is an aromatic hydrocarbon.
- D. Option D: Phenol is a heterocyclic compound.
Explanation: The correct answer is Option D: Phenol is not a heterocyclic compound. A heterocyclic compound contains a ring structure with different…
Correct answer: Option D: Phenol is a heterocyclic compound.- A. Aromatic compounds
- B. Branched-chain compound
- C. Alicyclic compounds
- D. None of these
Explanation: Alicyclic compounds are 3 or more atoms of carbon are linked together in a ring.
Correct answer: Branched-chain compound11659. Choose the correct option
- A. One of the best-known gardens is the Generalife - a word which comes from the Arabic, Jannat al'-arif, "the inspector's paradise".
- B. One of the best-known gardens are the Generalife - a word which comes from the Arabic, Jannat al'-arif, "the inspector's paradise".
- C. One of the best-known gardens is the Generalife - a word which come from the Arabic, Jannat al'-arif, "the inspector's paradise".
- D. One of the best-known garden is the Generalife - a word whose comes from the Arabic, Jannat al-arif, "she inspector's paradise".
Explanation: One of the best-known gardens is the Generalife - a word which comes from the Arabic, Jannat al-'arif, "the inspector's paradise." This…
Correct answer: One of the best-known gardens is the Generalife - a word which comes from the Arabic, Jannat al'-arif, "the inspector's paradise".- A. H 2(s)
- B. I 2(s)
- C. Cl 2(g)
- D. CH 4(g)
Explanation: CH4 has largest intermolecular attraction because as it form sp3 hybridization in which bond energy is greater
Correct answer: CH 4(g)