NEET · Chemistry · STD 11 - 1. Some basic concept of chemistry

If Avogadro number \(N_A,\) is changed from \(6.022 \times 10^{23}\ mol^{-1}\) to \(6.022 \times 10^{20}\ mol^{-1},\) this would change

A the mass of one mole of carbon
B the ratio of chemical species to each other in a balanced equation
C the ratio of elements to each other in a compound
D the definition of mass in units of grams.

Verified Solution

Answer & Solution

Correct Answer

(A) the mass of one mole of carbon

Step-by-step Solution

Detailed explanation

mass of \(1 \mathrm{mol}\;(6.022 \times 10^{23} \text { atoms) of carbon }=12 \mathrm{g}\) If Avogadro Number \((NA)\) is changed than mass of \(1 mol\;( 6.022 \times 10^{20}\) atom) of carbon. \(=\frac{12 \times 6.022 \times 10^{20}}{6.022 \times 10^{23}}=12 \times 10^{-3} g\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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