Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : Sodium reacts with oxygen to form \(Na _{2} O _{2}\) but potassium reacts with oxygen to form \(KO _{2}\).
Reason (R) : Potassium is more reactive metal than sodium.
In the light of the above statements, choose the correct answer from the options given below
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : Sodium reacts with oxygen to form \(Na _{2} O _{2}\) but potassium reacts with oxygen to form \(KO _{2}\).
Reason (R) : Potassium is more reactive metal than sodium.
In the light of the above statements, choose the correct answer from the options given below
- If both Assertion and Reason are true and Reason is correct explanation of Assertion.
- If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- If Assertion is true but Reason is false.
- If both Assertion and Reason are false.
The Correct Option is B
Solution and Explanation
Top AIIMS Chemistry Questions
- Freon used as refrigerant is
- Which of the following statement is true ?
- Natural rubber is a polymer of
- In Wolff-Kishner reduction, the carbonyl group of aldehydes and ketones is converted into
- $0.037\, g$ of an alcohol, $R$-OH was added to $C _{2} H _{5} MgI$ and the gas evolved measured $11.2\, cc$ at STP. The molecular mass of $R- OH$ will be
Top AIIMS GROUP 1 ELEMENTS Questions
- The formula of microcosmic salt and the product obtained by heating it is
- $KO _{2}$ (potassium superoxide) is used in oxygen cylinders in space and submarines because of it
- When a substance ' $A$ ' reacts with water, it produces a combustible gas ' $B$ ' and a solution of substance ' $C$ ' in water. while another substance ' $D$ ' reacts with solution of ' $C$ ' to produce the same gas $B$ on warming while ' $D$ ' can produce gas ' $B$ ' on reaction with dilute $H _{2} SO _{4}$ at room temperature. ' $A$ ' imparts a deep golden yellow colour to a smokeless flame on Bunsen burner. Identify 'A', $' B$ ', ' $C$ ' and ' $D$ ' respectively are
- Among the following components of cement which is present in highest amount?
- Portland cement contains the following amount of $CaO$
Top AIIMS Questions
- Which of the following is true?
- The ratio of the dimensions of Plancks constant and that of the moment of inertia is the dimension of
- Biological Oxygen Demand (BOD) is a measure of
- Freon used as refrigerant is
- Which of the following statement is true ?
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.