Which of the following statements is not correct?
- Be and Mg give characteristic colour to the flame.
- Be and Mg have high ionisation energy
- Sulphates of Be and Mg are readily soluble in water.
- All are correct
The Correct Option is A
Solution and Explanation
The correct answer is:
Option 3: Sulphates of Be and Mg are readily soluble in water.
Explanation:
Option 1: Be and Mg give characteristic colour to the flame:
This statement is correct. Both beryllium (Be) and magnesium (Mg) salts give characteristic colours when burned in a flame. Beryllium gives a green flame, and magnesium produces a bright white flame.
Option 2: Be and Mg have high ionisation energy:
This statement is also correct. Beryllium and magnesium have relatively high ionisation energies due to their small atomic size and the strong attraction between the electrons and the nucleus.
Option 3: Sulphates of Be and Mg are readily soluble in water:
This statement is incorrect. While magnesium sulphate (MgSO₄) is soluble in water, beryllium sulphate (BeSO₄) is only sparingly soluble in water and requires high temperatures for dissolution.
Option 4: All are correct:
Since Option 3 is incorrect, this option is not valid.
Thus, Option 3 is the statement that is not correct.
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Concepts Used:
Group 1 Elements
Group one of alkali metals is s-block elements with just one electron in their s-orbital. They are are alkali metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkali metals are characterized by one s-electron in the valence shell of their atoms.
Alkali metals have a corresponding [Noble gas] ns1 electronic configuration. They occupy the first column of the periodic table. Alkali elements are:
- Lithium(Li)
- Sodium(Na)
- Potassium (K)
- Rubidium (Ru)
- Cesium (Cs)
- Francium (Fr)
They have occupied successive periods from first to seven. Francium is a radioactive element with very low half-life.
Electronic Configuration:
- Alkali metals have one electron in their valence shell.
- The electronic configuration is given by ns1. For example, the electronic configuration of lithium is given by 1ns1 2ns1.
- They tend to lose the outer shell electron to form cations with charge +1 (monovalent ions).
This makes them the most electropositive elements and due to the same reason, they are not found in the pure state.