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
Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements.
  1. Lithium and oxygen.
  2. Magnesium and nitrogen.
  3. Aluminium and iodine.
  4. Silicon and oxygen.
  5. Phosphorus and fluorine.
  6. Element 71 and fluorine.
✓

Answer

a. $\mathrm{Li}_2 \mathrm{O}$
b. $\mathrm{Mg}_3 \mathrm{~N}_2$
c. $\mathrm{All}_3$
d. $\mathrm{SiO}_2$
e. $\mathrm{PF}_3$ or $\mathrm{PF}_5$
f. The element with the atomic number 71 is Lutetium (Lu). It has valency 3 . Hence, the formula of the compound is $\mathrm{LuF}_3$.

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

Commercially available concentrated hydrochloric acid contains $38 \% \mathrm{HCl}$ by mass.
i. What is the molarity of the solution (density of solution $=1.19 \mathrm{~g} \mathrm{~mL}^{-1}$ )?
ii. What volume of the above concentrated HCl is required to make 1.0 L of 0.10 M HCl ?
→
What happens when:
  1. Aluminium is treated with dilute NaOH.
  2. Boric acid is added to water.
  3. Diborane is reacted with $\text{H}_2\text{O}$.
→
What happens when :
(i) ethylene dibromide is heated with zinc.
(ii) solution of sodium succinate is electrolysed.
(iii) ethylene dichloride is heated with zinc.
→
Define electron gain enthalpy. What are its units?
→
0.90 g of organic compound on combustion gave $2.64 \mathrm{g}$ of $\mathrm{CO}_2$, and 0.63 g of $\mathrm{H}_2 \mathrm{O}$. Calculate the percentage of C and H in the compound.
→
5.975g of the higher oxide of metal gave 5.575g of lower oxide on heating. The quantity of the lower oxide gave 5.175g of metal on reduction. Prove that these results are in accordance with the law of multiple proportions.
→
The combustion of one mole of benzene takes place at 298K and 1atm. After combustion, $\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are produced and 3267.0kJ of heat is liberated. Calculate the standard enthalpy of formation of benzene $(\Delta_\text{f}\text{H}^\circ).$$\Delta_\text{f}\text{H}^\circ\text{CO}_2(\text{g})=-393\text{kJ mol}^{-1}$ and $\Delta_\text{f}\text{H}^\circ\text{H}_2\text{O(l})=-285.83\text{kJ mol}^{-1}.$
→
Describe the general trends in the following properties of the elements in Groups 13 and 14.
Ionisation enthalpy.
→
A certain buffer is made by mixing sodium formate and formic acid in water. With the help of equations explain how this buffer neutralizes addition of a small amount of an acid or a base?
→
What do you understand by:
  1. Electron-deficient.
  2. Electron-precise, and
  3. Electron-rich compounds of hydrogen? Provide justification with suitable examples.
→