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 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>
2 0.5 mole of CH4and 0.5 mole of SO2gases have equal Volume Mass is gram Total number of atoms Number of molecules
3 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>
4 The mass of one mole of proton is 1.008 g 0.184 g 1.673 g 1.008 mg
5 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>
6 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>
7 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>
8 When nitrogen is 5.6 grams in NO2. then number of moles of NO2is 0.5 0.4 0.04 0.05
9 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>
10 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>
11 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>
12 How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain? 0.02 0.2 0.4 0.8
13 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>
14 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
15 A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X? SO SO<sub>2</sub> SO<sub>3</sub> SO<sub>4</sub>
16 One mole of ethanol and one mole of ethane have an equal Mass Number of atoms Number of electrons Number of molecules
17 Which has greater number of moles 0.1 g sodium 6.02 x 10<sup>20</sup>atoms of magnesium 20 cm<sup>3</sup>0.1<sup></sup>mole per dm<sup>3</sup>of NaOH 12.2 dm<sup>3</sup>of nitrogen at standard<div>[A<sub>r</sub>Na = 23, Mg = 24, O = 16]</div>
18 A compound having empirical formula C3H3O and its molecular mass is 110.02. Its molecular formula is C<sub>3</sub>H<sub>3</sub>O C<sub>6</sub>H<sub>6</sub>O<sub>2</sub> C<sub>9</sub>H<sub>9</sub>O<sub>3</sub> C<sub>3</sub>H<sub>6</sub>O<sub>2</sub>
19 A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is 46 78 110 180
20 The percentage of which element in the organic compound is determined by the difference method Carbon Hydrogen Nitrogen Oxygen
21 The value of R(General Gas Constant) is <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">8.3134 JK</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1</span></sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mole</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1</span></sup></p><p class="MsoNormal"><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;"><o:p></o:p></span></sup></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.987 Cal K</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1</span></sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Mole</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1<o:p></o:p></span></sup></p> Both a and b <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.987 JK</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1</span></sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mole</span><sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif;">-1</span></sup><o:p></o:p></p>
22 The empirical formula of a liquid compound is known to be C2H4O. What other information is needed to work out its molecular formula? The percentage composition of the compound The relative molecular mass of the compound The density of the compound The volume occupied by one mole of the compound
23 Which one of the following compounds does not have the empirical formula CH2O? Ethanoic acid, CH<sub>3</sub>CO<sub>2</sub>H Ethanol, CH<sub>3</sub>CH<sub>2</sub>OH Glucose, C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> Methanal, HCHO
24 Which of the following compounds contains the highest percentage by mass of nitrogen? Ammonia, NH<sub>3</sub> Ammonium carbamate, NH<sub>2</sub>CO<sub>2</sub>NH<sub>4</sub> Ammonium carbonate, (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> Hydrazine, N<sub>2</sub>H<sub>4</sub>
25 Which of the following statements is not true? Isotopes with even atomic masses are comparatively abundant Isotopes with even atomic masses are comparatively abundant Isotopes with even atomic masses and even atomic numbers are comparatively abundant Isotopes with even atomic masses and odd atomic number are comparatively abundant
26 Isotopes differ in the Number of neutrons Number of protons Number of electrons Number of atoms
27 The relative abundance of the ions with a definite m/e value is measured by High pressure of vapours Strength of electric current measured Quantity of fast moving electrons Electron gas
28 The pressure of vapours when sent to the ionization chamber in mass spectrometer is 10<sup>-5</sup>to 10<sup>-6</sup>torr 10<sup>-6</sup>to 10<sup>-7</sup>torr 10<sup>-7</sup>to 10<sup>-8</sup>torr 10<sup>-3</sup>to 10<sup>-4</sup>torr
29 The relative abundance of Pb isotopes is 1.5% Pb204, 23.6% Pb206, 22.6% Pb207, 52.3% Pb208The relative atomic mass of Pb is 207.94 208.24 206.94 207.24
30 The empirical formula of a compound is CH2O. What may be the compound C<sub>2</sub>H<sub>5</sub>OH C<sub>6</sub>H<sub>5</sub>OH HCOOH
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