Download App

3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Ionic radii are
  • A
    Directly proportional to effective nuclear charge
  • B
    Directly proportional to square of effective nuclear charge
  • ✓
    Inversely proportional to effective nuclear charge
  • D
    Inversely proportional to square of effective nuclear charge.
✓

Answer

Correct option: C.
Inversely proportional to effective nuclear charge
c
(c) $n^{th}$ Ionic radius in the nth orbit is given by ${r_n} = \frac{{{n^2}a}}{z}$ or ${r_n} \propto \frac{1}{Z}$

where $n$ is principal equation no., $a$ bohr's radius of hydrogen atom and $Z$ is the effective nuclear energy.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 3. Classification of elements and periodicity in properties→3. Classification of elements and periodicity in properties — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of the following undergoes sulphonation at fastest rate ?
→
Identify the major product of the following reaction
→
The newman projection formula of most stable conformation of $3-$ Hydroxypropanal is
→
$50\, mL$ of $0.1\, M$ solution of a salt reacted with $25\, mL$ of $0.1\, M$ solution of sodium sulphite. The half reaction for the oxidation of sulphite ion is

$SO{{_{3}^{2-}}_{\left( aq. \right)}}+{{H}_{2}}{{O}_{\left( l \right)}}\to SO{{_{4}^{2-}}_{\left( aq. \right)}}+2{{H}^{+}}_{\left( aq. \right)}+2{{H}^{+}}_{\left( aq. \right)}+2{{e}^{-}}$

If the oxidation number of metal in the salt was $+3$, what would be the new oxidation number of metal?

→
The correct order of the first ionization enthalpy is
→
In which state, the matter have highest entropy
→
At $298.2\, \mathrm{~K}$ the relationship between enthalpy of bond dissociation (in $\mathrm{kJ} \,\mathrm{mol}^{-1}$ ) for hydrogen $\left(\mathrm{E}_{\mathrm{H}}\right)$ and its isotope, deuterium $\left(\mathrm{E}_{\mathrm{D}}\right)$, is best described by:
→
Aromatic compounds containing benzene ring are termed as :
→
Which of the following is not correctly matched
→
What is the product of $1, 4$ -addition in the reaction shown below ?
→