entrance exam paper for iit

PHYSICAL CHEMISTRY
Daily Practice Problems
Target IIT JEE-2027
CLASS : XI TIME : 35 MIN. DPP.NO.1

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1. The number of neutrons present 124 amu of P4 is (Given : 15 P )

(A) 16 (B) 16NA (C) 64 NA (D) 64


2. 10 mole of CO2 contains
(A) 220 electrons (B) 440 mol protons
(C) 220 mol neutrons (D) 220 × 6.02 × 1023 nucleons


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3. No. of neutrons in 74 g of 17 Cl is :

(A) 2 × NA (B) 34 × NA (C) 40 × NA (D) 34


4. The number of moles of electrons in 4.2 g of N3– ion (nitride ion) is
(A) 0.3 (B) 2.1 (C) 3 (D) 0.9


5. No. of electrons in 11.5 g Na+ is
(A) 5.5 × NA (B) 5 NA (C) 11 NA (D) None of these


6. Which of the following contains highest number of oxygen atoms ?
(A) 2 g of O (B) 2 g of O2
(C) 2 g of O3 (D) all have the same number of atoms


7. The mass of an electron is 9.11 × 10–31 kg. Molar mass of electron is :
(A) 1.5 × 10–31 g mol–1 (B) 5.5 × 10–4 g mol–1
(C) 5.5 × 10–10 g mol–1 (D) 9.11 × 10–28 g mol–1


8. Number of moles in 1.8 g H2O is equal to number of moles in
(I) 18 g glucose (C6H12O6) (II) 6 g urea (NH2CONH2) (III) 34.2 g sucrose (C12H22O11)
(A) I, II, III (B) I, II (C) I, III (D) II, III


9. In 37
(I) 17 14CO molecule
Cl atom (II) 2 (III) water (H2O) molecule

Calculate :
(i) Number of electrons (ii) Number of protons (iii) Number of neutrons (iv) Number of nucleons


10. Calculate the mass of one molecule/formula (in amu) of the following species :
(i) CO2 (ii) H2SO4 (iii) CuSO4 . 5H2O (iv) KMnO4
(v) CaCO3 (vi) C6H6 (vii) KClO3 (viii) FeSO4.(NH4)2SO4.6H2O




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