All Free Chemistry MCQs with Answers

• A. Half filled subshell
• B. Completely filled subshell
• C. Partially filled subshell
• D. Bought Options A and B are correct

Explanation: As per Hund's rule, atoms with half-filled or completely-filled orbitals are comparably more stable, so removing an electron from such…

• A. Number of electrons
• B. Number of Unpaired electrons
• C. Number of Paired electrons
• D. Number of Protons

Explanation: Melting point: The constant temperature at which a solid changes into liquid is called melting point.

• A. n2
• B. 2n2
• C. 2n
• D. 3n

Explanation: Option BThe number of electrons accommodated in an orbit is given by 2n2.

• A. Electronic configuration
• B. Ionic size
• C. Reactivity
• D. pH

Explanation: Isoelectronic species are atoms, ions, or molecules that have the same number of electrons and therefore the same electronic…

• A. beings-block elements
• B. inert gas configurations
• C. ns1 electronic configuration
• D. being metals

Explanation: Second ionization energy can be defined as the removal of one mole of electron from the one mole of monovalent gaseous cation of the…

• A. [He] 2s1
• B. [Ne] 3s1
• C. [Ne] 3s2
• D. [He] 2s2

Explanation: Option A) [He] 2s1 is incorrect because the electronic configuration of helium (He) has only two electrons in its 1s orbital, and…

• A. [Ar] 4s23d4
• B. [Ar] 4s23d5
• C. [Ar] 4s13d4
• D. [Ar] 4s13d5

Explanation: The atomic number of Cr is 24. Its electronic configuration is as follows;[Ar]4s13d5If we follow the AufBau principle, it should have been…

• A. 8
• B. 32
• C. 18
• D. 25

Explanation: The maximum number of electron that can accommodate in a shell is given by the formula 2n2.

• A. Half filled subshell
• B. Completely Filled Subshell
• C. Partially filled subshell
• D. Both A and B

Explanation: Half-filled subshells and completely filled subshells have a symmetrical distribution of electrons e.g. p3 or p6.

• A. Pt
• B. Fe
• C. Cu
• D. W

Explanation: Tungsten (W) is used in bulbs because of its physical properties like high melting point compared to other options and apt resistivity to…

• A. Lead
• B. Copper
• C. Silver
• D. Gold
• E. None of the above

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

• A. Mn
• B. Fe
• C. Zn
• D. Cr

Explanation: The electronic configuration of zinc is [Ar]3d10 4s2 It can only lose two electrons from the 4s orbital and show +2 oxidation state.

• A. Cu
• B. Sc
• C. Zn
• D. Cr

Explanation: Zn has its d orbital completely filled thus it cannot be called a transition element and cannot possess the properties shown by the…

• A. Na
• B. Cr
• C. Rb
• D. K

Explanation: Chromium (Cr) is a transition metal, therefore it forms complexes due to the difference in the electronic configuration.

• A. 48
• B. 32
• C. 58
• D. 28
• E. 38

Explanation: According to federal text book, there are 38 transition elements. These d-block elements have 4 series i.e first outer transition series…

• A. Because of high melting point
• B. Because d-electrons of outer shell take part in bonding
• C. Because s-electrons of the outer shell take part in bonding
• D. Both s and d electrons take part in bonding

Explanation: Metallic bonding is a type of chemical bonding that arises from electrostatic attractive forces between conduction electrons in the form…

• A. Diamagnetic
• B. Paramagnetic
• C. Good conductor
• D. Ferromagnetic

Explanation: Paramagnetic substances are attracted to magnetic fields.

• A. Ligand
• B. Monodentate ligand
• C. Bidentate ligand
• D. Polydentate ligand

Explanation: Bidentate ligands have two electron pairs that they can donate to form a dative bond.

• A. Zn
• B. Mg
• C. H
• D. All of these

Explanation: C is correct option because several interstitial compounds are formed by the transition metals.

• A. Complex compound
• B. Transition element ion
• C. Anion
• D. Complex anion

Explanation: [Fe(CN)6)4- is a complex species as it has a central transition metal ion, Fe2+, that is surrounded by 6 anions, CN-, which act as ligands…