All Free Chemistry MCQs with Answers

• A. Li2O
• B. MgO
• C. AlF
• D. NaF

Explanation: c) AlF (aluminum fluoride):AlF consists of aluminum (Al) and fluorine (F) atoms.

• A. F
• B. Cl
• C. Br
• D. I

Explanation: Due to its large atomic size, the first IE of Xe is very less, while the valence electrons are much further away from the nucleus, meaning…

• A. Ar→Ca2+→K+
• B. Ar→K+→Ca2+
• C. K+→Ca2+→Ar
• D. Ca2+→K+→Ar

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

• A. Colorless
• B. Paramagnetic
• C. Diamagnetic
• D. ns2 np6 configuration

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

• A. Moseley
• B. Newland
• C. Lothar Meyer
• D. Mendeleev

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

• A. I A
• B. III A
• C. IV A
• D. VII A

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

• A. Ne
• B. He
• C. X
• D. Kr

Explanation: Helium is the least polarizable noble gas due to presence of weakest Van der Waal's forces.

• A. Increase in atomic radius
• B. Decrease in atomic radius
• C. Increase in electronegativity
• D. All of the above options are correct

Explanation: Electron affinity decreases from top to bottom within a group. This is caused by the increase in atomic radius.

• A. NaCl
• B. AlCl3
• C. MgCl3
• D. KCl

Explanation: The ionic characteristics decrease as we move from left to right in the periodic table and it increases as we move top to bottom in any…

• A. F2
• B. Cl2
• C. Br2
• D. I2

Explanation: Order of reactivity towards halogenation is F2 > Cl2 >Br2 > I2.

• A. NaCl
• B. MgCI3
• C. AICl3
• D. KCI

Explanation: The difference in electronegativity between aluminium (Al) and chlorine (Cl) is 3.16-1.61 = 1.55 which is lower than 1.7, hence, according…

• A. Proton number increases
• B. Atomic radius increases
• C. Shielding decrease
• D. Atomic radius decreases

Explanation: As atomic size increases, the electrons become further away from the nucleus and hence, electron affinity decreases.

• A. Complete outermost shell
• B. Ability to form negative ion
• C. Existence as diatomic molecule
• D. Smaller size and higher nuclear charge in the resepective period

Explanation: Small size and high nuclear charge is the reason of high EN of fluorine

• A. Cs
• B. Fr
• C. Li
• D. K

Explanation: Francium is toxic due to its radioactivity

• A. Protium
• B. Deuterium
• C. Tritium
• D. Both A & C

Explanation: Heavy water contains the isotope of hydrogen known as Deuterium. Deuterium is an isotope of hydrogen that has one proton and one neutron…

• A. Acidity of the metal
• B. Polarization power
• C. Basicity of the metal
• D. None of these options are correct

Explanation: OPTION A: Acidic character increases with an increase in oxidation state because the tendency to gain electrons increases with the…

• A. Cs
• B. Fr
• C. Li
• D. K

Explanation: Francium is radioactive because it contains unstable nuclei and is able to naturally release energy in the process of shedding high speed…

• A. K3(AlF6)
• B. AIH3
• C. K[AIF3H]
• D. K3[AIF3H3]

Explanation: Aluminium forms fluoride complexes more easily. So, AlF3 easily dissolve in mixture of (HF+KF).AlF3 is soluble in HF due to the formation…

• A. Sodium and Lithium.
• B. Lithium and Magnesium.
• C. Lithium and Berylium.
• D. Boron and Beryllium.

Explanation: Lithium (Li) and magnesium (Mg) show a diagonal relationship in the periodic table.

• A. Size of atoms
• B. Nuclear charge
• C. Number of shells
• D. All of these

Explanation: Ionization energy depends on: -atomic size -nuclear charge -shielding/screening effect -nature of orbital