Question : Which of the following statements is correct?
Option 1: Atomic radius increases across a period and decreases down a group in the periodic table.
Option 2: Atomic radius decreases across a period and increases down a group in the periodic table.
Option 3: Atomic radius decreases across a period and down a group in the periodic table.
Option 4: Atomic radius increases across a period and increases down a group in the periodic table.
Correct Answer: Atomic radius decreases across a period and increases down a group in the periodic table.
Solution : The correct option is Atomic radius decreases across a period and increases down a group in the periodic table.
This trend occurs because, across a period, increasing nuclear charge attracts electrons more strongly, leading to a decrease in atomic size. Down a group, atomic radius increases due to the addition of electron shells, leading to electrons being further from the nucleus, resulting in larger atomic size.
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Question : Solubility of gases in liquids ______ with a decrease in temperature.
Option 1: remains constant
Option 2: first decreases and then increases
Option 3: increases
Option 4: decreases
Question : What will happen to the level of water in a vessel when a piece of ice floating in it melts?
Option 1: Decreases
Option 2: Increases
Option 3: Remains same
Option 4: First increases and then decreases
Question : Identify whether the given statements about ionisation energy are correct or incorrect.
Statement A: The ionisation energy of an atom is the amount of energy that is required to remove an electron from a mole of atoms in the gas phase.
Statement B: The ionisation energy increases from top to bottom in groups and decreases from left to right across a period.
Option 1: Both Statements A and B are correct.
Option 2: Only Statement A is correct.
Option 3: Both Statements A and B are incorrect.
Option 4: Only Statement B is correct.
Question : Identify whether the given statements about p-block elements are correct or incorrect.
Statement A: In p-block elements, the last electron enters the outermost p orbital.
Statement B: The non-metals and metalloids exist only in the p-block of the periodic table.
Question : Which of the following is not true when the interest rate in the economy goes up?
Option 1: Saving increases
Option 2: Lending decreases
Option 3: Cost of production increases
Option 4: Return on capital increases
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