ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Splitting of spectral lines when atoms are subjected to strong electron field is called Zeeman effect Stark effect Photoelectric effect Compton effect
2 The radius of first orbit of hydrogen atom 0.329 A° 0.429 A° 0.529 A° 0.229 A°
3 Which of the following is not charged particle Proton Electron Neutron Hydrogen nucleus
4 Which of the following is not a sub-atomic particle Electron Proton Neutron Deuteron
5 Which of the following is not a property of cathode rays They can produce x-rays when they strike a heavy metal anode They can cause reduction reaction They produce fluorescence in rare earth and minerals They comprise neutral particles
6 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
7 The amount of products obtained from the balanced chemical equation is regarded as Theoretical yield Actual yield % yield Experimental yield
8
9 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>
10 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
11 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
12 How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10? 2 8 10 13
13 0 dm<sup>3</sup> 3 dm<sup>3</sup> 2 dm<sup>3</sup> 3 dm<sup>3</sup>
14 300 cm<sup>3</sup> 200 cm<sup>3</sup> 150 cm<sup>3</sup> 100 cm<sup>3</sup>
15 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
16 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
17 The volume occupied by 1.4 g of N2 at S.T.P is 2.24 dm<sup>3</sup> 22.4 dm<sup>3</sup> 1.12 dm<sup>3</sup> 112 cm<sup>3</sup>
18 0.5 mole of CH4and 0.5 mole of SO2gases have equal Volume Mass is gram Total number of atoms Number of molecules
19 What is the volume in cm3of 3.01 x 1023molecules of O2gas at S.T.P 1000 cm<sup>3</sup> 11000 cm<sup>3</sup> 1120 cm<sup>3</sup> 11200 cm<sup>3</sup>
20 The mass of one mole of proton is 1.008 g 0.184 g 1.673 g 1.008 mg
21 The largest number of molecules are present in 3.6 g of H<sub>2</sub>O 4.8 g of C<sub>2</sub>H<sub>5</sub>OH 2.8 g of CO 5.4 g of N<sub>2</sub>O<sub>5</sub>
22 One mole of SO2contains 6.02 x 10<sup>23</sup>atoms of oxygen 18.1 x 10<sup>23</sup>, molecules of SO<sub>2</sub> 6.02 x 10<sup>23 </sup>atoms of sulphur 4 gram atoms of SO<sub>2</sub>
23 3.01 x 1022Ag+ions is present in 85 grams AgNO<sub>3</sub> 0.85 g AgNO<sub>3</sub> 8.5 g AgNO<sub>3</sub> 18.5 g AgNO<sub>3</sub>
24 When nitrogen is 5.6 grams in NO2. then number of moles of NO2is 0.5 0.4 0.04 0.05
25 A ring contains 3 gram diamond. The number of C-atoms which a ring contains is 3.01 x 10<sup>23</sup> 1.5 x 10<sup>23</sup> 6.02 x 10<sup>24</sup> 3.01 x 10<sup>24</sup>
26 One mole of C2H5OH contains the number of H-atoms 6.02 x 10<sup>23</sup> 3.61 x 10<sup>24</sup> 1.81 x 10<sup>24</sup> 6.02 x 10<sup>24</sup>
27 A balloon contains 0.02 gram of H2gas, it contains H2molecules 6.02 x 10<sup>23</sup> 3.01 x 10<sup>22</sup> 6.02 x 10<sup>21</sup> 3.01 x 10<sup>21</sup>
28 How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain? 0.02 0.2 0.4 0.8
29 A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/ C<sub>3</sub>H<sub>8</sub> CH<sub>4</sub> C<sub>2</sub>H<sub>4</sub> C<sub>2</sub>H<sub>6</sub>
30 Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same Empirical formula Number of atoms in a molecules Number of isomers Relative molecular mass
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