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Some Basic Concepts of Ch question bank (Chemistry)

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Q1.

Match List-I with List-II.

List-I Mass of substance	List-II Number of atoms
A. $1.8$ mg water	I. $2\times 10^{-4}\times N_A$
B. $9.8$ mg sulphuric acid	II. $1.5\times 10^{-4}\times N_A$
C. $1.8$ mg carbon	III. $3\times 10^{-4}\times N_A$
D. $5.85$ mg salt (NaCl)	IV. $7\times 10^{-4}\times N_A$

Choose the correct answer from the options given below:

(A)

A-IV, B-III, C-I, D-II

(B)

A-III, B-II, C-IV, D-I

(C)

A-III, B-IV, C-II, D-I

(D)

A-III, B-IV, C-I, D-II

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Q2.

Which of the following contain the same number of atoms ? (Given : Molar mass in g mol$^{-1}$ of H, He, O and S are $1, 4, 16$ and $32$ respectively)
A. $2$ g of O$_2$ gas
B. $4$ g of SO$_2$ gas
C. $1400$ mL of O$_2$ at STP
D. $0.05$ L of He at STP
E. $0.0625$ mol of H$_2$ gas
Choose the correct answer from the options given below :

(A)

A and B only

(B)

B and C only

(C)

C and D only

(D)

A, C and E only

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