Tiêu đề 01. SOME BASIC CONCEPTS OF CHEMISTRY.pdf ✅

PAPER 1 (1.) The right option for the mass of CO2 produced by heating 20g of 20% pure limestone is (Atomic mass of Ca 40 = ) 1200 K CaCO CaO CO 3 2   → +     (1) 2.64 g (2) 1.32 g (3) 1.12 g (4) 1.76 g (2.) A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% chlorine. Its molar mass is 98.96gm . What are molecular formula : (1) C H Cl 2 4 2 (2) C H Cl 3 4 3 (3) C H Cl 2 4 (4) C H Cl 4 2 2 (3.) Calculate the molarity of NaOH in the solution prepared by dissolving its 4 gm in enough water to form 500ml of the solution : (1) 0.4M (2) 0.2M (3) 0.8M (4) 0.5M (4.) Given below are two statements : Statement-1 : Molarity of pure water is 55.5M. Statement-2 : Molarity is temperature dependent parameter. In the light of the above statements, choose the most appropriate answer from the options given below : (1) BothStatement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is correct (4) Both Statement I and Statement II are correct. (5.) The maximum number of molecules are in : (1) 1.6 g of CH4 (2) 16 g of CH4 (3) 16 moles of CH4 (4) 16mg of CH4 (6.) Calculate the number of atoms in 9.8 g of sulphuric acid : (1) A 5 N 10 (2) A 7 N 10 (3) A 4 N 10 (4) A 7 N (7.) For the given reaction 2 3 4 A B C + → How many moles of C will be formed by reacting 10 moles of A and 24 moles of B : (1) 32 (2) 20 (3) 10 (4) 18
(8.) The number of atoms in 6.4 g of a tetratomic gas having vapour density as 8 are : (1) A 0.4 N (2) 0.4 (3) A 0.8 N (4) A 1.6 N (9.) Statement-1 : The ratio by volume of H : Cl : HCl 2 2 in a reaction H Cl 2HCl 2 g 2 g g ( ) ( ) ( ) + → is 1:1: 2. Statement-2 : Substances always react in such a way that their volume ratio is in simple integers. (1) Both Statement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is correct (4) Both Statement I and Statement II are correct. (10.) A solution is heated to raise the temperature by 5 units, which of the following concentration terms will remain unaffected : (1) Molarity (2) Mole fraction (3) Mass % (4) Both 2 and 3 (11.) How much volume of CO2 will be produced by burning 36 g of carbon in the presence of oxygen: (1) 22.4 L (2) 11.2 L (3) 112 L (4) 67.2 L (12.) How many moles of H are there in 3 moles of CH COOH 3 : (1) 4 3 (2) 3 3 (3) A 3 N (4) A 12 N (13.) Which of the following has maximum number of atoms : (1) 20 g of S6 (2) 20 g of S2 (3) 20 g of S8 (4) All will have same number of atoms (14.) 10 g of A is mixed with 15 g of B . Find the mass % of A in the binary solution : (1) 40% (2) 20% (3) 10% (4) 67% (15.) If the concentration of glucose (C H O 6 12 6 ) in blood is 1 0.9gL− , what will be the molarity of glucose in blood? (1) 5M (2) 50M (3) 0.005M (4) 0.5M (16.) The number of atoms in 120amu of Ca are : (1) 10 (2) 3 (3) A 3 N (4) A 30 N (17.) If the ratio of molar mass and empirical mass is 2, the find the molecular formula of the compound having empirical formula as CH Cl 2 : (1) CH Cl 2 (2) CH Cl 4 2 (3) C H Cl 2 4 2 (4) C H Cl 2 4
(18.) In air what the ratio of no. of molecules of O2 and N2 is: (1) 1 6 (2) 1 4 (3) 1 2 (4) 1 8 (19.) The number of moles present in 18 mL of H O2 at room temperature are : (1) 18 22400 (2) 1 (3) NA (4) A 18 N 22400 (20.) What are the total no. of electrons present in 1.6 gm methane : (1) A 0.1 N (2) A 0.2 N (3) NA (4) A 10 N (21.) If 3 moles of N2 reacts with 9 moles of H2 . Find the moles of ammonia produced : (1) 9 moles (2) 12 moles (3) 6 moles (4) 2 moles (22.) The total number of valence electrons in 4.2 g of Azide ion is : (1) A 3 N (2) A 1.6 N (3) NA (4) A 2.2 N (23.) The one having minimum number of moles is : (1) 8 g of O2 (2) 36 g of H O2 (3) 4 g of CO2 (4) 25 3.011 10  particles of He (24.) What will be the minimum molecular mass of an enzyme having 5.6% of nitrogen in it : (1) 25 (2) 2500 (3) 250 (4) 500 (25.) Identify the correct statement for 49 g of H PO 3 4 (Phosphoric acid) : (1) There are 0.5 moles in the sample (2) N / 2 A molecules are there in it (3) There are A 2 N atoms of oxygen in it (4) All are correct (26.) A gas has molecular formula x (CH) . If vapour density of the gas is 39 , what should be the formula of the compound : (1) CH3 3 (2) C H2 2 (3) C H4 4 (4) C H6 6 (27.) Given below are two statements: one is labelled as Assertion( A) and the other is labelled as Reason (R). Assertion(A): Equal moles of different substances contain same number of constituent particles. Reason(R): Equal weights of different substances contain the same number of constituent particles. In the light of the above statements, choose the most appropriate answer from the options given below:
(1) Both (A) and (R) are correct but (R) is not the correctexaplanation of ( A) (2) (A) is correct but (R) is not correct (3) (A) is not correct but (R) is correct (4) Both (A) and (R) are correct and (R) is the correct explanation of (A) (28.) The amount of oxalic acid (mol. wt. =126) required to prepare 500 mL of its 0.10M solution is : (1) 0.315 g (2) 3.15 g (3) 6.30 g (4) 63.0 g (29.) 1amu is equal to : (1) 27 1.66 10 Kg −  (2) 23 1 gm 6.02 10  (3) 24 1.66 10 gm −  (4) All (30.) In three moles of ethane (C H2 6 ) calculate the Number of hydrogen atoms and Number of carbon atoms respectively : (1) A 2 N and A 16 N (2) A 18 N and A 6 N (3) A 6 N and A 6 N (4) A 6 N and A 18 N (31.) What is the weight of oxygen required for the complete combustion of 2.8g of ethylene : (1) 2.8 g (2) 6.4 g (3) 9.6 g (4) 96 g (32.) Four one litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be (1) 1:1:1:1 (2) 1:2:2:3 (3) 2:1:2:3 (4) 3:2:2:1 (33.) 1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. Concentration of solution is : (1) 10ppm (2) 100ppm (3) 1000ppm (4) 10000ppm (34.) The mass of one carbon atom in gram : (1) 23 1.99 10 g  (2) 23 1.99 10 g −  (3) 24 1.99 10 g  (4) 24 1.99 10 g −  (35.) 4.4gm of CO2 and 4.48 It of O2 at S.T.P are mixed in a container. The total no. of molecules present in the container is : (1) 22 1.8069 10  (2) 23 1.8069 10  (3) 24 1.8069 10  (4) None