Home
Class 12
CHEMISTRY
In each of the following two questions t...

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) - Both 106 g of sodium carbonate and 12 g of graphite have same number of carbon atoms
Reason (R) - Both 106 g sodium carbonate and 12 g of graphite contain 1 g-atom of carbon

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

C

Assertion is true but Reason is false

D

Both Assertion and Reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze both the Assertion (A) and the Reason (R) provided in the question. ### Step 1: Analyze the Assertion (A) The assertion states that both 106 g of sodium carbonate (Na₂CO₃) and 12 g of graphite have the same number of carbon atoms. 1. **Calculate the molar mass of sodium carbonate (Na₂CO₃)**: - Sodium (Na) has a molar mass of approximately 23 g/mol. Since there are 2 sodium atoms: \[ 2 \times 23 = 46 \text{ g/mol} \] - Carbon (C) has a molar mass of approximately 12 g/mol: \[ 1 \times 12 = 12 \text{ g/mol} \] - Oxygen (O) has a molar mass of approximately 16 g/mol. Since there are 3 oxygen atoms: \[ 3 \times 16 = 48 \text{ g/mol} \] - Adding these together gives: \[ 46 + 12 + 48 = 106 \text{ g/mol} \] 2. **Calculate the number of moles of sodium carbonate in 106 g**: - Using the formula: \[ \text{Number of moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{106 \text{ g}}{106 \text{ g/mol}} = 1 \text{ mole} \] - Since 1 mole of Na₂CO₃ contains 1 mole of carbon atoms, it has 1 mole of carbon. ### Step 2: Analyze the Reason (R) The reason states that both 106 g of sodium carbonate and 12 g of graphite contain 1 gram-atom of carbon. 1. **Calculate the number of moles of carbon in 12 g of graphite**: - The molar mass of carbon (C) is 12 g/mol. - Using the formula: \[ \text{Number of moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{12 \text{ g}}{12 \text{ g/mol}} = 1 \text{ mole} \] - Therefore, 12 g of graphite also contains 1 mole of carbon atoms. ### Conclusion Both 106 g of sodium carbonate and 12 g of graphite contain the same number of carbon atoms, which is 1 mole (or 1 gram-atom) of carbon. ### Final Answer - Assertion (A) is true. - Reason (R) is true and provides the correct explanation for Assertion (A). Thus, the correct choice is: **Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.** ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion (A): Both 138 g of K_(2)CO_(3) and 12 g of carbon have some number of carbon atoms. Resaon (R ): Both contains 1 g atom of carbon which contains 6.022 xx 10^(23) carbon atoms.

In the following question a statement of assertion (A) is followed by a statement of reason (R ) A: Absolute value of potential is not defined R : Two equipotential lines cannot intersect each other.

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : Both methane and tetrachloromethane are nonpolar. R : C-Cl bond is polar bond.

In the following questions a statement of assertion (A) is followed by a statement of reason ( R). A: A vector cannot be divided by other by other vector . R: A vector can be divided by a scalar .

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A : O_(2) is paramagnetic . R : N_(2) is paramagnetic .

In the following questions, a statement of assertion (A) is followed by a statement of reason (R ) A: bond angle of BF_(3) and NF_(3) are different. R : Both the molecules are having different shape

In the following questions a statement of assertion (A) is followed by a statement of reason ( R) A : F is most electronegative element of periodic table. R : CI is having highest electron affinity.

In the following questions a statement of assertion (A) is followed by a statement of reason ( R) A: Be and AI show diagonal relationship . R: Be and AI are diagonal to each other in the periodic table .

Each question contains STATEMENTS-1 (Assertion) and STATEMENT -2 (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: STATEMENT-1: Neutron are the best bombarding particles. STATEMENT-2: Neutrons are neutral particles.

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Bond order of CO_3^-2 is 1.33 R: Carbonate ion is isoelectronic with nitrate ion.