

InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
101. |
What is the average molecular weight of a gas containing 20% N2 (molecular wt. = 28) and 80% SO2 (molecular wt. = 64)?(a) 28.4(b) 56.8(c) 24.4(d) 48.8I have been asked this question in an interview for job.The above asked question is from Mole and Molecular Weight-III in division Introductory Concepts of Chemical Process Calculation |
Answer» The correct choice is (B) 56.8 |
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102. |
What is the concentration of 36 grams of water occupying 1 m3 volume?(a) 1 mole / m3(b) 2 mole / m3(c) 11 mole / m3(d) 22 mole / m3The question was posed to me by my school principal while I was bunking the class.My question is based upon Concentration-I in section Introductory Concepts of Chemical Process Calculation |
Answer» The correct OPTION is (b) 2 mole / m3 |
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103. |
A student has two solution of a substance. Solution-1: 25M, 400mL and Solution-2: 30M, 300M. What is the molarity of the final solutions if these two solutions are mixed?(a) 27.14(b) 22.14(c) 14.22(d) 14.27This question was addressed to me at a job interview.This intriguing question comes from Concentration-I in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT answer is (a) 27.14 |
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104. |
Flow rate of the material in kg/min.(a) 0.262(b) 0.252(c) 0.242(d) 0.232I had been asked this question in an internship interview.Enquiry is from Density and specific gravity-II topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The correct choice is (a) 0.262 |
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105. |
The specific weight is also known as ________(a) Specific density(b) Specific volume(c) Weight density(d) None of the mentionedThe question was posed to me in class test.My question comes from Density and specific gravity-II topic in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT answer is (C) Weight density |
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106. |
What is the mass fraction of O in the sample?(a) 0.2(b) 0.4(c) 0.6(d) 0.8I have been asked this question in my homework.I would like to ask this question from Choosing a Basis topic in section Introductory Concepts of Chemical Process Calculation |
Answer» The correct answer is (b) 0.4 |
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107. |
What is the composition of the O2 gas on an SO2-free basis?(a) 0.78 and 0.22(b) 0.22 and 0.78(c) 0.70 and 0.25(d) 0.25 and 0.78This question was addressed to me in homework.My question comes from Choosing a Basis topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (a) 0.78 and 0.22 |
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108. |
25 psia is equal to(a) 25.88 in Hg(b) 50.88 in Hg(c) 75.88 in Hg(d) 100.88 in HgI got this question in an interview for internship.This intriguing question originated from Pressure and Hydrostatic Head-III in portion Introductory Concepts of Chemical Process Calculation |
Answer» CORRECT CHOICE is (B) 50.88 in Hg Easy explanation: 25 psia = (25*29.92)/14.7 = 50.88 Hg. |
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109. |
The smallest temperature is(a) 25 degree Celsius(b) 250 degree Fahrenheit(c) 560 degree Rankine(d) 400 KelvinI had been asked this question during a job interview.This intriguing question comes from Temperature in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT ANSWER is (d) 400 Kelvin |
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110. |
What is the density of the liquid in kg/m3?(a) 2.39×10^3(b) 2.39(c) 2.39×10^2(d) None of the mentionedThis question was addressed to me during an interview.Question is taken from Density and specific gravity-I topic in section Introductory Concepts of Chemical Process Calculation |
Answer» Correct option is (a) 2.39×10^3 |
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111. |
What is the mole fraction of Ar?(a) 0.2(b) 0.4(c) 0.6(d) 0.8I had been asked this question during a job interview.I'm obligated to ask this question of Mole and Molecular Weight topic in section Introductory Concepts of Chemical Process Calculation |
Answer» Correct CHOICE is (a) 0.2 |
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112. |
What is the weight percentage of C2H4?(a) 41.17(b) 51.17(c) 61.17(d) 71.17I had been asked this question in class test.This intriguing question comes from Mole and Molecular Weight in section Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT CHOICE is (a) 41.17 |
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113. |
What is mole percentage of C3H8?(a) 0.2(b) 0.4(c) 0.6(d) 0.8This question was posed to me during an interview for a job.My question is taken from Mole and Molecular Weight topic in portion Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT CHOICE is (a) 0.2 |
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114. |
What is the mole fraction of N2?(a) 0.2(b) 0.4(c) 0.6(d) 0.8This question was addressed to me during an internship interview.This question is from Mole and Molecular Weight topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (b) 0.4 |
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115. |
How many moles of O2 are there in the cylinder?(a) 1(b) 2(c) 4(d) 6I had been asked this question during an interview.My doubt is from Mole and Molecular Weight topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» CORRECT choice is (B) 2 Easy explanation: Number of MOLES = mass / MOLECULAR WEIGHT. |
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116. |
What is mole percentage of H2SO4?(a) 10.4(b) 20.4(c) 30.4(d) 40.4I had been asked this question by my school teacher while I was bunking the class.I'd like to ask this question from Mole and Molecular Weight-IV in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Right option is (c) 30.4 |
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117. |
Flow rate can be expressed as?(a) Kg/s(b) Litres/s(c) Moles/s(d) All of the mentionedI had been asked this question during an internship interview.My question comes from Flow Rate in section Introductory Concepts of Chemical Process Calculation |
Answer» The correct CHOICE is (d) All of the mentioned |
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118. |
The velocity of water in a pipe of area 10 m2 is 5 m/s, what will be the flow rate of water?(a) 25 m3 / s(b) 50 m3 / s(c) 75 m3 / s(d) 100 m3 / sI had been asked this question during an online interview.The above asked question is from Flow Rate topic in division Introductory Concepts of Chemical Process Calculation |
Answer» RIGHT choice is (b) 50 m3 / s To explain I WOULD say: FLOW rate = Area*Velocity = 5*10 = 50 m3/s. |
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119. |
Pressure at a point in the liquid is(a) Same in all directions(b) Greater in the upward direction(c) Grater in the downward direction(d) None of the mentionedI had been asked this question during a job interview.This intriguing question comes from Pressure and Hydrostatic Head-II in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Right answer is (c) Grater in the DOWNWARD direction |
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120. |
A force opposite to the force required to support a mass in gravitational field is(a) Pressure(b) Weight(c) Gravitational acceleration(d) None of the mentionedI had been asked this question during an online exam.My question is based upon Pressure and Hydrostatic Head-II in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Correct answer is (b) Weight |
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121. |
What is mass of the solute that is present in 50 mL of a 0.15 mol/L solution of NaCl?(a) 0.22(b) 0.44(c) 0.66(d) 0.88This question was addressed to me in an internship interview.Origin of the question is Concentration-II topic in division Introductory Concepts of Chemical Process Calculation |
Answer» Correct CHOICE is (b) 0.44 |
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122. |
A 1000 ml solution has 0.25 gms of solute. What is the concentration(gm/L)?(a) 0.25(b) 2.5(c) 25(d) 250This question was addressed to me in a job interview.My enquiry is from Concentration-II topic in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT CHOICE is (a) 0.25 |
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123. |
How many moles of Ne are there in the cylinder?(a) 1(b) 2(c) 4(d) 6The question was posed to me at a job interview.The doubt is from Mole and Molecular Weight topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Correct option is (B) 2 |
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124. |
Relative molecular mass of CO2 is _________(a) 22(b) 44(c) 66(d) 88This question was addressed to me in final exam.Query is from Mole and Molecular Weight-V in section Introductory Concepts of Chemical Process Calculation |
Answer» RIGHT ANSWER is (B) 44 The BEST explanation: Relative molecular mass = Molecular mass of C + 2(Molecular mass of Oxygen). |
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125. |
What are the number moles of Oxygen present there in the bucket?(a) 14.82(b) 13.82(c) 12.82(d) 11.82The question was posed to me in quiz.My question is based upon Mole and Molecular Weight-IV in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Correct OPTION is (d) 11.82 |
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126. |
How many gm moles oxygen are there in 88 gms carbon di oxide?(a) 1(b) 2(c) 3(d) 4This question was posed to me in an online quiz.Question is from Mole and Molecular Weight-III in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (d) 4 |
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127. |
How many molecules are there in 4*10^-3 lb moles of carbon?(a) 12.044 *10^23(b) 12.044 *10^26(c) 12.044 *10^29(d) 12.044 *10^22This question was posed to me during an interview.My question is from Mole and Molecular Weight-II in division Introductory Concepts of Chemical Process Calculation |
Answer» The correct CHOICE is (a) 12.044 *10^23 |
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128. |
A pseudo molecular weight computed by dividing the mass in a mixture or solution by the number of moles in the mixture or solution is called(a) Molecular weight(b) Average molecular weight(c) Atomic weight(d) None of the mentionedI have been asked this question during an online interview.My doubt is from Mole and Molecular Weight-II in section Introductory Concepts of Chemical Process Calculation |
Answer» Right answer is (b) Average molecular WEIGHT |
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129. |
The __________ of an element is the mass of an atom based on the scale that assigns a mass of exactly 12 to the carbon isotope 12C .(a) Molecular weight(b) Average molecular weight(c) Atomic weight(d) None of the mentionedI have been asked this question in quiz.My question is from Mole and Molecular Weight-II topic in portion Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (c) Atomic weight |
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130. |
Mass of a compound per mole is _________(a) Mole(b) Molecular weight(c) Mole fraction(d) None of the mentionedI got this question in an interview for job.This intriguing question originated from Mole and Molecular Weight-II in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Right option is (b) Molecular weight |
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131. |
How many pounds of NaOH are in 15 g mole of NaOH?(a) 1.32(b) 2.64(c) 3.96(d) 5.28The question was posed to me in a job interview.Enquiry is from Mole and Molecular Weight-II topic in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT choice is (a) 1.32 |
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132. |
How much gram mole of H2SO4 is there in the vessel?(a) 18.53(b) 0.0408(c) 18.53(d) None of the mentionedThis question was addressed to me during an interview.This intriguing question comes from Mole and Molecular Weight-II in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Correct OPTION is (a) 18.53 |
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133. |
58.5 gms of NaCl contains(a) 1 gm mole of NaCl(b) 1 lb mole of NaCl(c) Both a and b(d) Neither a nor bThis question was posed to me in class test.My doubt stems from Mole and Molecular Weight-I topic in portion Introductory Concepts of Chemical Process Calculation |
Answer» Correct CHOICE is (a) 1 GM mole of NaCl |
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134. |
How many gram moles of N2 does it contain?(a) 8107(b) 6789(c) 7583(d) 7357This question was posed to me in final exam.This intriguing question comes from Mole and Molecular Weight-I topic in division Introductory Concepts of Chemical Process Calculation |
Answer» Right ANSWER is (a) 8107 |
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135. |
How many lb moles of O are there in 22 g of H2SO4?(a) 1.978*10^-4(b) 1.978*10^-3(c) 1.978*10^-2(d) 1.978*10^-1I have been asked this question in an interview.My query is from Mole and Molecular Weight-I in portion Introductory Concepts of Chemical Process Calculation |
Answer» Right CHOICE is (b) 1.978*10^-3 |
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136. |
How many g moles of S are there in 22 g of H2SO4?(a) 0.4489(b) 0.2245(c) 0.1256(d) 0.3256I got this question in homework.This intriguing question originated from Mole and Molecular Weight-I topic in portion Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (b) 0.2245 |
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137. |
Two statements are given as below I: lb mole is composed of 453.6*6.022*1023 moleculesII: gm mole is composed of 6.022*1023 moleculesNumber of correct statements is/are(a) 0(b) 1(c) 2(d) None of the mentionedI have been asked this question by my school teacher while I was bunking the class.This question is from Mole and Molecular Weight-I in section Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT ANSWER is (c) 2 |
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138. |
How many g moles of H are there in 22 g of H2SO4?(a) 0.4489(b) 0.2245(c) 0.1256(d) 0.3256This question was posed to me in an interview.My doubt is from Mole and Molecular Weight-I topic in division Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT OPTION is (a) 0.4489 |
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139. |
Molecular weight is the ratio of _______ and ________(a) Mass, Mole(b) Mole, Mass(c) Mole, Mole(d) Mass, MassI had been asked this question in an international level competition.This key question is from Mole and Molecular Weight-I topic in division Introductory Concepts of Chemical Process Calculation |
Answer» Correct CHOICE is (a) MASS, Mole |
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140. |
Amount of substance containing 6.022*10^23 entities is called(a) Mole(b) Molecular weight(c) Molar mass(d) None of the mentionedThe question was asked in unit test.This interesting question is from Mole and Molecular Weight-I in section Introductory Concepts of Chemical Process Calculation |
Answer» The correct CHOICE is (a) MOLE |
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141. |
Using the proper number of significant figures 6 X 6 equals to(a) 3(b) 4(c) 36(d) 40I had been asked this question in homework.My doubt stems from Signifiant Figures in division Introductory Concepts of Chemical Process Calculation |
Answer» Correct choice is (d) 40 |
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142. |
How many significant numbers are there in 420?(a) 1(b) 2(c) 3(d) 0This question was posed to me in exam.My question comes from Signifiant Figures topic in section Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (b) 2 |
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143. |
0.009046879855, round off the number to three significant figures(a) 0.0905(b) 0.0904(c) 0.09046(d) 0.09035This question was posed to me by my college director while I was bunking the class.Enquiry is from Signifiant Figures in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT answer is (a) 0.0905 |
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144. |
Correctly rounded, the product 3.000 cm × 30.0 cm is(a) 9.0 x 10^1 cm^2(b) 9.000 x 10^1 cm^2(c) 9 x 10^1 cm^2(d) 9.00 x 10^1 cm^2I have been asked this question in class test.Question is taken from Signifiant Figures topic in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Correct choice is (d) 9.00 x 10^1 cm^2 |
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145. |
Correctly rounded, the quotient 5.000 g / 50.0 mL is(a) 0.10 g/mL(b) 0.1 g/mL(c) 0.100 g/mL(d) 0.1000 g/mLThis question was posed to me during an interview for a job.My doubt stems from Signifiant Figures in division Introductory Concepts of Chemical Process Calculation |
Answer» Correct OPTION is (C) 0.100 g/mL |
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146. |
The theoretical production rate of a chemical is 1µg/(mL)(min.). What is the actual production rate of the chemical in lb mol/ (day)(ft3) with an efficiency of 98%?(a) 0.0880(b) 0.0800(c) 0.0449(d) 0.529I had been asked this question during a job interview.This interesting question is from Signifiant Figures topic in section Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT option is (a) 0.0880 |
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147. |
The given numbers are shown with their significant figures respectively. Find out the wrong one option?(a) 26.24 and 4(b) 24000. and 5(c) 0.000460 and 3(d) 28000.0 and 5I got this question in a job interview.My query is from Signifiant Figures in portion Introductory Concepts of Chemical Process Calculation |
Answer» Correct ANSWER is (d) 28000.0 and 5 |
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148. |
Standard form of 2145.67 is(a) 2.14*10^3(b) 2.14567*10^3(c) 0.214*10^4(d) None of the mentionedI got this question during an interview for a job.I'd like to ask this question from Signifiant Figures in chapter Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT CHOICE is (B) 2.14567*10^3 |
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149. |
What is the unit of A?(a) atm(b) K(c) 1/atm(d) 1/KThe question was asked in class test.My doubt stems from Dimensional Consistency topic in section Introductory Concepts of Chemical Process Calculation |
Answer» The CORRECT ANSWER is (a) atm |
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150. |
Find out the dimensionless quantity(a) Pressure(b) Reynolds number(c) Viscosity(d) DensityThis question was posed to me in class test.The doubt is from Dimensional Consistency in chapter Introductory Concepts of Chemical Process Calculation |
Answer» Right answer is (b) REYNOLDS number |
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