Tiêu đề CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.pdf ✅

NEET PREPARATION CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY NEET PREPARATION Date: April 16, 2025 Dura on: 0:03:00 Total Marks: 180 INSTRUCTIONS INSTRUCTIONS CHEMISTRY 1. Calculate the mass in gm of molecules of [Q306810] (a) 22 gm (b) 44 gm (c) 88 gm (d) None of these 2. Amongst the following statements, that which was not proposed by Dalton was - [Q306608] (a) All the atoms of a given element have identical properties in‐ cluding identical mass. Atoms of different ele‐ ments differ in mass (b) When gases com‐ bine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same T & P (c) Matter consists of indivisible atoms (d) Chemical reactions involve reorganization of atoms. These are nei‐ ther created nor de‐ stroyed in a chemical reaction. 3. Match the column I with column II and mark the appropriate choice. Column I Column II A - Mass of produced when 0.5 mole of zinc re‐ acts with excess of HCl P - molecules B - Mass of all atoms of a compound with formula Q - molecules C - Number of molecules in g of R - g Column I Column II D - Number of molecules in g of S - g [Q307062] (a) A - Q, B - P, C - S, D - R (b) A - P, B - Q, C - R, D - S (c) A - S, B - R, C - P, D - Q (d) A - S, B - R, C - Q, D - P 4. The mass of of gas at STP is [Q306693] (a) 0.085 g (b) 0.850 g (c) 8.500 g (d) 80.500 g 5. If a substance ' A ' dissolves in solution of a mix‐ ture of ' B ' and ' C ' with their respective number of moles as and . Mole fraction of C in the solution is [Q306961] (a) (b) (c) (d) 6. Boron has two stable isotopes, and . The atomic mass that should appear for boron in the periodic table is [Q306591] (a) 10.8 amu (b) 10.2 amu (c) 11.2 amu (d) 10.0 amu 7. The weight of required to prepare 500 mL of 0.2N solution is [Q306884] (a) 1.26g (b) 6.3g (c) 1.575g (d) 3.15g 8. Which of the following element can exist as atomicity 8? [Q306773] 2NA CO2 H2 3.01 × 10 23 C70H22 6.023 × 10 23 35.5 Cl2 1.43 × 10 −21 64 SO2 1 112 cm3 NH3 nA, nB nC nC nA−nB−nC nC nA+nB+nC nC nA×nB×nC nB nA+ nB 10B (19%) 11B (81%) H2C2O4 .2H2O 4/19/25, 3:28 PM CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY file:///C:/Users/DSREENATH/Downloads/NEET/CHEMISTRY/EASY/ONLY QUNS/CHXI01_SOME BASIC CONCEPTS OF CHEMISTRY.html 1/4