ECAT Chemistry Chapter 1 Basic Concepts Online Test With Answers

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ECAT Chemistry Chapter 1 Basic Concepts Online Test

Sr. # Questions Answers Choice
1 Isotopes of an element differ in Number of protons Number of electrons Number of neutrons Number of electrons and protons
2 The phenomenon of isotropy was first discovered by Soddy Rutherford Bohr Dalton
3 The isotopes of an element Possess same mass number Possess same number of protons Do not possess same chemical properties May or may not possess same chemical properties
4 The negatively charged particles are called Cation Radical Anion Positron
5 Macromolecules are organic molecules High molecular mass molecules Natural compounds Rarely occurring molecules
6 8 g 16 g 32 g 24 g
7 The number of moles of CO2which contain 8.0 g of oxygen 0.25 0.50 1.0 1.50
8 99.2% 99.5% 90.5% 96.2%
9 84.84 % 89.89% 81.81% 90.90%
10 0.5 mole of CH4and 0.5 mole of SO2gases have equal Volume Mass in grams Total number of atoms Number of molecules
11 One of the following statements is incorrect Actual yeild is always less than the theoretical yield The formula of a compound is not definite Law of conservation of mass is applied in stoictiometry Boyles law is applied in stoichiometry
12 The quantitative relationship between the substances according to balanced equation describes Reversible reactions Stoichiometry Limiting reacting Percentage composition
13 N<sub>2</sub>O<sub>4</sub>is limiting reactant N<sub>2</sub>H<sub>4</sub>is the limiting reactant Reactants are completely converted to the products Reactions is reversible
14 Which one of the following step is not involved in determination of empirical formula Determination % of each element Determination of gram atom of each element Determination of isotopes of each element Determination of atomic ratio of element
15 A beaker contains 9 grams of water. The number of H-atoms is 6.02 x 1023 3.01 x 1023 6.02 x 1024 3.01 x 1024
16 1.12 dm3of N2gas at S.T.P. has mass of N2gas 2.8 g 2.4 g 1.4 g 14 g
17 32 g 3.2 g 5.6 g 9.6 g
18 The mass of Al2S3formed when 20 grams Al reacts completely with S is 60 g 50 g 50.55 g 55.55 g
19 The mass of sulphur which combines with 24 grams oxygen to form SO2 32 gram 24 gram 8 gram 12 gram
20 A limiting reactant is one which according to the stoichiometric equation Has excess mass Has least mass Has excess number of moles Has least number of moles
21 The amount of products obtained from the balanced chemical equation is regarded as Theoretical yield Actual yield % yield Experimental yield
22
23 When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced 10 cm<sup>3</sup> 25 cm<sup>3</sup> 48 cm<sup>3</sup> 100 cm<sup>3</sup>
24 If four moles of sulpur dioxide are oxidised to sulphur trioxide, how many moles of oxygen molecules are required 0.5 1.0 1.5 2.0
25 What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al2O3? 26 g 127 g 51 g 108 g
26 How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10? 2 8 10 13
27 0 dm<sup>3</sup> 3 dm<sup>3</sup> 2 dm<sup>3</sup> 3 dm<sup>3</sup>
28 300 cm<sup>3</sup> 200 cm<sup>3</sup> 150 cm<sup>3</sup> 100 cm<sup>3</sup>
29 Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide? Carbon monoxide Diamond Ethane Methane
30 A limiting reactant is the one which Is taken in lesser quantity in grams as compared to other reactants Is taken in lesser quantity in volume as compared to other reactants Gives the maximum amount of the product which is required Gives the minimum amount of the product under consideration
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