No. of atoms = Atomicity × mole ×NA (A) No. of atoms =6×106212×NA=12 NA (B) No. of atoms =3×62248×NA=12 NA (C) No. of atoms =3×40240×NA=18 NA (D) No. of atoms =2×212×NA=12 NA (E) No. of atoms =3×44220×NA=15NA
NEET UG 2025 — Chemistry Physical Chemistry
Among the following choose the ones with equal number of atoms. A. 212 g of Na2CO3( s) [molar mass =106 g ] B. 248 g of Na2O (s) [molar mass =62 g ] C. 240 g of NaOH(s) [molar mass =40 g] D. 12 g of H2( g) [molar mass =2 g ] E. 220 q of CO2(q) [molar mass =44 g] Choose the correct answer from the options given below:
Held on 30 Apr 2025 · Verified 9 Jul 2026.
A, B and C only
A, B and D only
B, C and D only
B, D and E only
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
The unit of rate constant for a first-order reaction is:
For the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = -198 kJ. Which condition favours forward reaction?
The standard heat of formation, in $\mathrm{kcal} / \mathrm{mol}^{\text {of }} \mathrm{Ba}^{2+}$ is : [Given : standard heat of formation of $\mathrm{SO}_4^{2-}$ ion (aq) $=-216 \mathrm{kcal} / \mathrm{mol}$, Standard heat of crystallisation of $\mathrm{BaSO}_4(\mathrm{~s})=-4.5 \mathrm{kcal} / \mathrm{mol}$, standard heat of formation of $\left.\mathrm{BaSO}_4(\mathrm{~s})=-349 \mathrm{kcal} / \mathrm{mol}\right]$
Match List - I with List - II $\begin{array}{llll} & \begin{array}{l} \text { List-I } \\ \text { (Example) } \end{array} & & \begin{array}{l} \text { List-II } \\ \text { (Type of Solution) } \end{array} \\ \text { A. } & \text { Humidity } & \text { I. } & \text { Solid in solid } \\ \text { B. } & \text { Alloys } & \text { II. } & \text { Liquid in gas } \\ \text { C. } & \text { Amalgams } & \text { III. } & \text { Solid in gas } \\ \text { D. } & \text { Smoke } & \text { IV. } & \text { Liquid in solid } \end{array}$ Choose the correct answer from the options given below:
The conjugate base of H₂SO₄ is:
Work through every NEET UG Physical Chemistry PYQ, year by year.