Download App

Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties3 Marks
Question
i. Arrange $\mathrm{Fe}^2 \mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}$ in increasing order of radii.
ii. Explain why Be has higher ionization enthalpy than B .
iii. Predict the formula of compound which might be formed by silicon and bromine.
✓

Answer

i. $\mathrm{Fe}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Fe}$ is an increasing order of ionic radii.
ii. Be (4) has electronic configuration $1 s^2 2 s^2$ whereas $B(5)$ has $1 s^2 2 s^2 2 p^1$.
The energy required to remove electron from completely filled 2 s orbital is higher than the energy required to remove electron from $2 p$ orbital.
iii. $\mathrm{SiBr}_4$ is a formula of compound which might be formed by Si and $\mathrm{Br}_2$.

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 "3 Marks Question" from Classification of Elements and Periodicity in Properties→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

According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/ h. Calculate the wavelength of the ball and explain why it does not show wave nature.
→
Consider the reactions:
$H_3PO_2(aq) + 4AgNO_3(aq) + 2H_2O(l) → H_3PO_4(aq) + 4Ag(s) + 4HNO_3(aq)$
$H_3PO_2(aq) + 2CuSO_4(aq) + 2 H2O(l) → H_3PO_4(aq) + 2Cu(s) + H_2SO_4(aq)$
$C_6H_5CHO(l) + 2[Ag(NH_3)_2]^+(aq) + 3OH^-(aq) → C_6H_5COO^-(aq) + 2Ag(s) + 4NH_3(aq) + 2H_2O(l)$
$C_6H_5CHO(l) + 2Cu^{2+}(aq) + 5OH^-(aq) → N$o change observed.
What inference do you draw about the behaviour of $Ag^+$ and $Cu^{2+}$ from these reactions?
→
Why do we pass $\mathrm{H}_2 \mathrm{S}$ gas in acidic medium in group 2?
→
Elements X, Y and Z have 4, 5 and 7 valence electrons respectively:
  1. Write the molecular formula of the compounds formed by these elements individually with hydrogen.
  2. Which of there compound will have the highest dipole moment?
→
Equilibrium constant, $K_c$ for the reaction
$\text{N}_2\text{ (g) + 3H}_2\text{ (g)}\rightleftharpoons2\text{NH}_3\text{ (g) at 500k is 0.061}$
At a particular time, the analysis shows that composition of the reaction mixture is $3.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~N}_2, 2.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{H}_2$ and $0.5 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{NH}_3$. Is the reaction at equilibrium? If not in which direction does the reaction tend to proceed to reach equilibrium?
→
Account for the following:
i. Which is smaller $\mathrm{Fe}^{2+}$ or $\mathrm{Fe}^{3+}$, why?
ii. Chlorine (Cl) have more negative electron gain enthalpy than Fluorine (F).
[Atomic no.: $\mathrm{F}=9, \mathrm{Cl}=17]$
iii. Anions are bigger in size than their parent atom.
→
Calculate the energy and frequency of the radiation emitted when an electron jumps from n = 3 to n = 2 in a hydrogen atom.
→
The density of 3 molal solution of NaOH is $1.110 \mathrm{~g} \mathrm{~mL}^{-1}$. Calculate the molarity of the solution.
→
Calculate the wavelength of an electron moving with a velocity of $2.05 \times 107 \mathrm{~ms}^{-1}$.
→
A cell is constructed using $\frac{\text{Cu}^{2+}}{\text{Cu}}$ and $\frac{\text{Al}^{3+}}{\text{Al}}$ electrodes.
  1. Identify cathode and anode.
  2. Write the reactions at anode, cathode and net cell reaction.
  3. Calculate $\text{E}^0_\text{cell}$
$\text{E}^0_\frac{\text{Al}^{3+}}{\text{Ag}}=-1.66\text{V}$

$\text{E}^0_\frac{\text{Cu}^{2+}}{\text{Cu}}=+0.34\text{V}$
→