All Free Chemistry MCQs with Answers

• A. Urea
• B. Methane
• C. Carbon dioxide
• D. Coal

Explanation: Organic compounds of carbon are classified as organic when carbon is bound to hydrogen.

• A. Closed chain hydrocarbons
• B. Open chain hydrocarbons
• C. Ring compounds
• D. Alicyclic compounds

Explanation: Acyclic are open-chain hydrocarbons while cyclic compounds are closed-chained compounds.

• A. Alpha helix
• B. Beta helix
• C. Spiral
• D. Concentrate

Explanation: In protein secondary structure, the beta helix refers to a left-handed helical conformation formed by the polypeptide chain.

• A. S
• B. C
• C. N
• D. O

Explanation: Nitrogen is in all amino acids and nucleotides, and therefore in all proteins.

• A. Alpha helix
• B. Beta helix
• C. Spiral
• D. Concentrate

Explanation: Option B is correct since B-pleated sheets found in globular protein X-ray structures are twisted.

• A. Elastic
• B. Non-crystalline
• C. Disorgnanized
• D. Both A and B

Explanation: The distinguishing features of fibrous proteins are: Elastic: Fibrous proteins can stretch and return to their original shape.

• A. Lipids
• B. Amino acids
• C. Proteins
• D. DNA

Explanation: Correct option:CWithin a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain.

• A. Carbon
• B. Hydrogen
• C. Nitrogen
• D. Sulfur

Explanation: Proteins are macromolecules composed of amino acids, which are linked together by peptide bonds.

• A. Animals
• B. Plants
• C. Human beings
• D. A and C

Explanation: C is Correct! Since humans are animals, they also contain globulin proteins, especially in their blood plasma.

• A. Simple
• B. Conjugated/compound
• C. Derived
• D. All of these

Explanation: Conjugated/compound proteins are made up of both protein and non-protein components.

• A. Extensive
• B. Intensive
• C. Colligative
• D. Physical

Explanation: The explanation for this question will be added soon.

• A. Homogenous mixture
• B. Colloid
• C. Belong to the same state of matter
• D. All of the above

Explanation: The explanation for this question will be added soon.

• A. Decreasing ionization
• B. Increasing ionization
• C. Maintaining ionization
• D. None of these options is correct

Explanation: Option A: In liquid chromatography, ion suppression describes the adverse effect on detector response due to reduced ionization efficiency…

• A. Energy of solution
• B. Enthalpy
• C. Energy of solvation
• D. None of the above

Explanation: The explanation for this question will be added soon.

• A. Dilute
• B. Saturated
• C. Unsaturated
• D. Supersaturated

Explanation: A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the…

• A. Immiscible
• B. Highly soluble
• C. Insoluble
• D. Partially soluble

Explanation: There are three essential plant nutrients for healthy growth: nitrogen (N), phosphorous (P), potassium (K).

• A. Gamma Rays
• B. X-Rays
• C. Spectrometry
• D. Electron Microscope

Explanation: X-ray crystallography is a method of determining the 3d arrangement of atoms within a molecule.

• A. Cooling
• B. Heating
• C. Impurity
• D. None of these options are correct

Explanation: Option C is correct since the presence of impurity due to its different electronic structure causes the structure of the crystal to…

• A. Crystallite
• B. Unit cell
• C. Unit crystal
• D. Monomer

Explanation: A unit cell is the smallest unit of any crystal lattice. Unit cells keep repeating and making a whole lattice by generating repeatedly in…

• A. Inter-titian distance R
• B. Inter ionic distance R
• C. Inter cationic distance R +
• D. Inter-anionic distance R-

Explanation: The answer is B. Interionic distance for any ionic compound determines the extent of attraction of anions and cations.