All Free Chemistry MCQs with Answers

• A. S and p block
• B. D and f block
• C. S and f block
• D. None of these options are correct

Explanation: The location of transition elements is in between the s and p block of the periodic table. Transition elements are found in the d-block.

• A. Fe²⁺
• B. Mn4⁺
• C. Cr³⁺
• D. Cu²⁺

Explanation: The electron configuration of Fe²⁺ is [Ar] 3d⁶. In the 3d orbital, there are 4 unpaired electrons.

• A. [Cr(NH3)5SO4]Cl
• B. [Co(NH2)4SO4]NO2
• C. [Cr(NH3)5Cl]SO4
• D. Both (A) and (C)

Explanation: BaCl2 gives white precipitate of BaSO4 with SO4 ions, so the complex must have SO4 ions in the ionization sphere.

• A. English
• B. Greek
• C. Roman number
• D. Latin

Explanation: Oxidation number of central metal in the complex is written in roman number i.e.K3[F+3e(CN)6 Potassium Hex cyanoferrate (III)

• A. Si
• B. P
• C. B
• D. All of these

Explanation: Silicon and boron are both nonmetals that are smaller than most transition metals, so they can fit into the interstitial sites in the…

• A. We are all really good friends so we would just having a laugh and egging one another on.
• B. We are all really good friends so we were just having a laughter and egging each other on.
• C. We are all really good friends so we were just having a laugh and egging each others on.
• D. We are all really good friends so we were just having a laugh and egging each other on.

Explanation: The correct option is: We are all really good friends so we were just having a laugh and egging each other on.

• A. Primary proteins
• B. Secondary proteins
• C. Tertiary proteins
• D. Quaternary proteins

Explanation: Antibodies are proteins the immune system produces to identify and neutralize foreign objects like bacteria and viruses.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: The primary structure of a protein is defined as the sequence of amino acids linked together to form a polypeptide chain Secondary…

• A. Adjacent to each other
• B. In successive spiral turns
• C. Between two different polypeptide chains
• D. None of the given options

Explanation: The most common types of secondary structures are the α helix and the β pleated sheet.

• A. Primary structure
• B. Secondary structure
• C. Tertiary structure
• D. Quaternary structure

Explanation: Hemoglobin has a quaternary structure. It consists of two pairs of different proteins, designated the α and β chains.

• A. Non-crystalline
• B. More amino acids
• C. Peptide bonds
• D. Soluble in aqueous medium

Explanation: The following question deals with the differences between Globular and fibrous proteins and the student must be able to identify the…

• A. Primary Proteins
• B. Secondary Proteins
• C. Tertiary Proteins
• D. Both Primary and Tertiary Proteins

Explanation: •Primary structure of protein is the simplest level of protein structure.It comprises the number and sequence of amino acids in a protein…

• A. Intermediate
• B. Simple
• C. Globular
• D. Fibrous

Explanation: Fibrous: This option is the correct answer. Fibrous proteins are characterized by their elongated, thread-like structure.

• A. A catalyst changes the potential energies of the reactants and products
• B. A catalyst decreases the temperature of the reaction which leads to a faster rate
• C. A catalyst lowers the activation energy barrier for the reaction by providing a different reaction mechanism.
• D. A catalyst raises the activation energy for the reaction which produces a faster rate

Explanation: Catalysts function by providing an alternate reaction mechanism that has a lower activation energy.Note that a catalyst decreases the…

• A. Activation energy
• B. Lattice energy
• C. Bond energy
• D. Hydration energy

Explanation: Explanation for this question will be added soon.

• A. More Energy
• B. No energy
• C. Less Energy
• D. A catalyst

Explanation: Exothermic reactions are bond-making reactions in which heat energy is released.

• A. 2, 4 - DNPH test
• B. Tollen's test
• C. Lucas test
• D. Fehling's solution test

Explanation: The "Lucas test" uses Lucas Reagent, which is a solution of Anhydrous zinc in concentrated H2SO4.

• A. 2-propanol
• B. 1- propanol
• C. 2 - ethanol
• D. 2 - propane-1-ot

Explanation: Reason: Isopropyl alcohol is another name for 2-propanol.

• A. CH3CH2OH
• B. CH3COOCH3
• C. CH3COCH3
• D. CH3CHO

Explanation: A Grignard reagent reacts with compounds containing active H atom, such as water, ammonia, amines, alcohols, alkynes etc., to form a…

• A. H3PO4
• B. H3PO2
• C. HPO3
• D. H3PO3

Explanation: 3 moles of OH- react with one mole of Phosphorus to form one mole of P(OH)3 or H3PO3. 3C2H5OH+PBr3→3C2H5Br + H3PO3