Statement I: Along the period, the chemical reactivity of the element gradually increases from group 1 to group 18.
Statement II: The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic.
In the light of the above statements, choose the most appropriate from the questions given below:
Statement II: The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic.
In the light of the above statements, choose the most appropriate from the questions given below:
Both statement-I and statement-II are true
- Statement-I is true and statement-II is false
- Statement-I is false and statement-II is true
- Statement-I and statement-II both are false
The Correct Option is C
Solution and Explanation
Statement I is incorrect. Chemical reactivity does not increase along the period. Instead:
For metals (on the left side of the periodic table), chemical reactivity decreases as we move across the period because ionization energy increases.
For nonmetals (on the right side of the periodic table), chemical reactivity increases as we move across the period due to higher electronegativity and electron affinity.
Thus, the chemical reactivity shows no uniform trend across the period, and the statement is false.
Statement II is correct. The oxides formed by:
- Group 1 elements (alkali metals) are basic in nature because these elements form oxides like Na2O and K2O, which react with water to form strong bases (e.g., NaOH).
- Group 17 elements (halogens) are acidic in nature because their oxides, like Cl2O7, react with water to form strong acids (e.g., HClO4).
Thus, Statement II is true.
Thus, the evaluation of the statements leads to the conclusion that: Statement I is false while Statement II is true, making the correct answer:
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Occurrence of metals
The existence of metals often plays an important role in our survival, even if we are unaware of them. Our reliance on metals has been strong since the old industrial era. From buildings to jewelry, we utilize them for everything. But where do we acquire these metals from and how are they made? Let's read the occurrence of metal in more detail.
Metals are found in the earth's crust, and it seems to be a good place to extract them through various processes such as metallurgy. The process of extracting metals from ores is called metallurgy. Mining is the most common method of extracting metals from the earth.
In nature, metals are mostly found in mixed conditions. However, they can also be found in a free state. In its natural state, a native metal is one that can be found in its pure form or as part of an alloy. Most metals are exposed to natural processes such as oxidation and corrosion. As a result, only non-reactive metals such as gold, silver, platinum, and others are discovered in their native or open-free condition. Most metals are obtained as compounds, which must be filtered to remove contaminants before being employed in numerous applications.
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