Classification of elements and Periodicity in properties MCQs for NEET — Chemistry Questions with Answers

Choose the correct option. Hint T=true F = False

I. In the second period atomic radii of Be is 90pm, F is 64pm, & that of Ne is 160pm

II. Atomic radii decreases from Li to Ne

III. The increase in size of Ne is due to presence of vanderwaals force of attractio n & presence of covalent bond

IV. In Ne there is absence of covalent bond therefore the radii is vanderwaals radii

V. The order of radii is Metallic > Covalent > Vanderwaals

Choose correct option I. $ Ionisation enthalpy \infty 1/shielding effect $ II. $ Ionisation enthalpy \infty Chemical reactivity $ III. $ Ionisation enthalpy \infty 1/Metallic character $ IV. $ Ionisation enthalpy \infty Effective nuclear charge $

Choose correct option

I. $Cs^+$ is the most hydrated than other alkali metal

II. Among the alkali metals, Li has the highest M.P

III. Li is the strongest reducing agent because of low ionisation enthalpy

IV. Li is the strongest reducing agent because the high ionisation potential compensated by high hydration enthalpy

V. Li is resemble to Al

Choose correct option

I. $ NaCl \lt NaI \lt NaF \lt NaBr $ Ionic character

II. $ Si \lt P \lt C \lt N$ Electronegativity

III. $ BeCl_2 \lt MgCl_2 \lt CaCl_2 \lt BaCl_2 $ Ionic character

IV. $Al^{3+} \lt Mg ^ {2+} \lt Na^{+} $ Ionic mobility

Choose correct option

I. Transition metals are characterised by variable oxidation state II. Elements of IB & IIB are transition elements

III. Elements of gp1 exhibit only +1 O.S

IV. Group 17 contains only gases

Choose correct option I. The ionisation enthalpy of Be > B II. d–Block elements are known as representative elements III. Palladium is the only element of fifth period that has no electron in fifth energy level IV. The second ionisation enthalpy of Al is greater than that of Mg V. Among Li, Be, B ,C N ; Li has least value of electron gain enthalpy

Choose correct option I. O.S of ‘O’ in $OF_2$ is –2 II. Ionisation enthalpy is the minimum amount of energy required to remove an electron from an atom III. Screening effect : it is the attraction of electron towards the nuclear IV. Half filled orbitals are more stable half fully filled orbitals

Match the following Set A

1. Strongest reductant
2. Fully filled d–orbital
3. Noble metal
4. Actinide Set B p) silver q) Berkelium r) Copper s) Iodide ion t) Sodium ion

Match the following Set A 1. Osmium 2. Lead 3. Tungsten 4. Caesium Set B p) Hardest metal electric q) poor conductor of current r) largest size s) most reactive solid matter t) highest oxidation state

Set A

1. Br
2. Ba
3. Se
4. Rb Set B p) Chalcogen q) alkali metal r) alkaline earth metal s) Halogen