ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 In gases and liquids, temperature is the measure of : Average transnational kinetic energies of molecules. Average vibrational kinetic energies of molecules. Average rotational kinetic energies of molecules. None of above
2 The rate of diffusion of a gas is : Inversely proportional to its density Inversely proportional to square root of its molecular mass Directly proportional to molecular mass Directly proportional to its density
3 Gases of air always remain in random motion and do not settle due to : Difference in molecular masses of air gases. Difference in partial pressure of gas molecules. Unequal number of different gas molecules. Elastic collision of gas molecules.
4 Gases exert pressure on walls of container because the gas molecules : Obey gas laws. Have definite volume. Collide with the walls of container. Collide with each other.
5 All gases can be compressed by : Keeping constant pressure Decreasing pressure Increasing pressure None of the above
6 The movement of molecules from a region of high pressure to vacuum is called : Evaporation Effusion Conduction Difusion
7 Which statement about gases is not correct ? The spread throughout the vessel. Pressure is due to collision There are large spaces between the molecules. molecules are arranged regularly.
8

Which of the following is the simplest form of matter?

 Gaseous state Liquid state Solid state All of above
9 A real gas obeying van der Waals' equation will resemble ideal gas if : both 'a' and 'b' are large both 'a' and 'b' are small 'a' is small and 'b' is large 'a' is large and 'b' is small
10 The deviation of a gas from ideal behavior is maximum at : -10<span style="font-size:11.0pt;line-height:107%; font-family:&quot;Calibri&quot;,sans-serif;mso-ascii-theme-font:minor-latin;mso-fareast-font-family: Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:&quot;Times New Roman&quot;;mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">°C and 5.0 atm</span> -10<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span> 100<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span> 0<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span>
11 The deviation of a gas from ideal behavior is maximum at : -10<span style="font-size:11.0pt;line-height:107%; font-family:&quot;Calibri&quot;,sans-serif;mso-ascii-theme-font:minor-latin;mso-fareast-font-family: Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:&quot;Times New Roman&quot;;mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">°C and 5.0 atm</span> -10<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span> 100<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span> 0<span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°C and 2.0 atm</span>
12 Gases deviate from ideal behavior at high pressure. Which of the following is correct for non-ideality ? At high pressure, the gas molecules move in one direction only. At high pressure, the collisions between the gas molecules are increased manifold. At high pressure, the volume of gas becomes insignificant. At high pressure, the inter molecular attraction become significant.
13 Equal masses of methane and oxygen are mixed in an empty container at 25°CThe fraction of total pressure exerted by oxygen is : 1/2 8/9 1/9 16/17
14 The order of the rate of diffusion of gases NH3,SO2, CL2, and CO2 IS : NH<sub>3 &gt;</sub>SO<sub>2 &gt;</sub>CL<sub>2 &gt;</sub>CO<sub>2</sub> NH<sub>3 &gt;</sub>CO<sub>2 &gt;</sub><sub></sub>SO<sub>2 &gt;</sub>CL<sub>2</sub> CL<sub>2 &gt;</sub>SO<sub>2 &gt;</sub><sub></sub>CO<sub>2 &gt;</sub>NH<sub>3</sub> NH<sub>3 &gt;</sub>CO<sub>2</sub><sub>&gt;</sub>CL<sub>2 &gt;</sub>SO<sub>2</sub>
15 The molar value of CO2 is maximum at : STP 127<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;"><span style="font-size:11.0pt;line-height:107%; font-family:&quot;Calibri&quot;,sans-serif;mso-ascii-theme-font:minor-latin;mso-fareast-font-family: Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:&quot;Times New Roman&quot;;mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">°</span>C and 1 atm</span> <span style="line-height: 14.98px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="line-height: 15.6933px;">0</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°</span><font face="Arial, sans-serif"><span style="font-size: 10.5pt;">C and 2 atm</span></font></span> <span style="line-height: 15.6933px;">273</span><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: 15.6933px;">°</span><span style="font-size: 10.5pt;">C and 2 atm</span>
16

How should condition be changed to prevent the volume of a given gas from expanding whine its mass is increased ?

 Temperature is lowered and pressure is increased Temperature is increasedand pressure is lowered Temperature and pressure both are lowered Temperature and pressure both are increased
17 If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will : remain unchanged increase four times reduce to 1/4 be doubled
18 If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will : remain unchanged increase four times reduce to 1/4 be doubled
19

Which of the following will have the same number of molecules at STP ?

 <p class="MsoNormal">280 CM<sup>3</sup> of CO<sup>2</sup> and 280 CM<sup>3</sup> of N<sub>2</sub>O<o:p></o:p></p> <p class="MsoNormal">11.2 dm3 of O<sub>2</sub> and 32 g of O<sub>2</sub><o:p></o:p></p> <p class="MsoNormal">44 g of CO<sub>2</sub> and 11.2 dm<sup>3</sup> of CO<o:p></o:p></p> <p class="MsoNormal">28 g of N2 and 5.6 dm<sup>3</sup> of oxygen<o:p></o:p></p>
20

Number of molecules in one dm3 of water is close to :

 <p class="MsoNormal">6.02/22.4<o:p></o:p></p> <p class="MsoNormal"><br></p> <p class="MsoNormal">12.04/22.4 *10<sup>23 <o:p></o:p></sup></p> <p class="MsoNormal"><br></p> <p class="MsoNormal">18/22.4*10<sup>23</sup></p> <p class="MsoNormal">55.6*6.02*10<sup>23 </sup>* 10<sup>23</sup></p>
21

Pressure remaining constant, at which temperature volume of gas will become twice of what it is at 0°C ?

 <p class="MsoNormal">546<o:p></o:p></p> 200 546K 273K
22 Naphthalene, iodine and NH4 can : Sublime. Both (a) and (c). Crystallize. None of above.
23 Direct conversion of solid into vapors is called : Crystallization Sublimation Obligation Vaporization.
24 Which one of the following substance is use as decolonizing agent Asbestos Animal charcoal conc, H<sub>2</sub>SO<sub>4</sub> Silica gel
25 Which one of the following substance is no used as drying agent in desiccators Silica gel CaCl<sub>2</sub> Phosphorous NaCL(50%)
26 The solution left after the formation of crystals is called : Residue. Filtrate. Mother liquor. None of these.
27 95% ethanol is called : Rectified ether. Diesel. Rectified spirit. Petrol.
28 A suitable solvent should dissolve maximum amount of solute at its boiling point and minimum amount at : Freezing point. Room temperature. Boiling point. Sea level temperature.
29 Sintered glass is a porous material use for : Absorpton Decoration. Filtration. All of above.
30 The reagents like KMnO4 and HCL cannot be filtered through Gooch crucible if its base is covered with : Butterfly paper. Ordinay paper. Flying paper. Filter paper.
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