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CHEMISTRY 2025
(Science Pre-Engineering & Pre-Medical Groups)
TIME: 3 Hours (85 Marks)
SECTION 'A' (Multiple Choice Questions)(17)
NOTE: i) This section consists of 17 part questions and all are to be answered. Each question carries one mark.
ii) Do not copy the part questions in your answer book. Write only the answer in full against the proper number of the question and its part.
iii) The use of scientific calculator is allowed.
1. Choose the correct answer for each from the given options:
(i) At 4°C the density of water is 1 gm/cm3 then the mass of 2 dm3 of water is: * 8gm * 100gm *1000 gm * 2000gm✓
(ii) Total number of atoms in one mole of methane (CH4) is: *6.02 × 1023 *3.01 × 1024 ✓ *1.81 × 1023 *30.1 × 1024
(iii) This colour has longest wave length: *Red✓ *Blue *Green *Orange
(iv) The magnetic quantum number for the last sub-shell having 3 electrons in phosphorous 13P31 is: *-1, 0, +1✓ *-1, 0, -1 *-1, 0, +2 *-1, 0, -2
(v) Maximum number of electrons in a sub-shell is: * 2l + 1 * 2l - 1 * 2(2l + 1)✓ * 2(2l + 1)
(vi) This is the least polar molecule: * HF * HCl * HBr * HI✓
(vii) The rate of diffusion of gas is 12 of that hydrogen then its molecular mass will be: * 8 amu✓ * 10 amu * 25 amu * 50 amu
(viii) This pair of gases do not obey Dalton's law of partial pressure: *H2 and He *H2and O2 *N2 and O2 *NH3 and HCl✓
(ix) This compound does not contain hydrogen bond: *CH4✓ *H2O *NH3 *HF
(x) In crystalline structure, then length of axes and angles are unequal then crystal system will be: *Cubic *Monoclinic *Orthorhombic *Triclinic✓
(xi) Kc = Kp, when Δn is equal to: *zero✓ *-1 *+1 *-2
(xii) This pair of ions is not iso-electronic: *Na+ and Mg2+ *Na+ and N3- *Na+ and S-2 *Al3+ and Na+
*Na+ and Mg2+
*Na+ and S-2
*Na+ and N3-
*Al3+ and Na+
(xiii) Quantum number values for 3p orbital are: *n = 2, l = 1 *n = 3, l = 2 *n = 3, l = 0 *n = 3, l = 1✓
(xiv) Two different solid having same crystal structure are called: *Allotropy *Polymorphous *Isotopes *Isomorphous✓
(xv) A colloidal solution of a liquid into another liquid is called: *Emulsion ✓ *Foam *Gel *Sol
(xvi) This liquid shows maximum surface tension: *Water *Ethyl Alcohol *Mercury✓ *Gasoline
(xvii) A reaction is first order with respect to “A” and second order with respect to “B” then the rate expression is: *Rate = K[A][B]2✓ * Rate = K [A]2[B] * Rate = K[A][B] * Rate = K[A][B]3
ATOMIC MASSES: (C = 12amu, H = 1amu, O = 16amu, Ca = 40amu, S = 32 amu, K = 39amu, Cr = 52 amu)
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