SINDH MDCAT 2019 CHEMISTRY#Gases#Ideal Gas Equation571Choose the best answerThe value of R (the gas constant) is: (Sindh MDCAT 2019)A0.0821 dm³ atm K mole⁻¹B803143 Nm K⁻¹ moleC0.0821 dm³ atm K⁻¹ mole⁻¹D8.3143 dm³ atm K⁻¹ mole⁻¹ Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Penetrating Power#Radioactivity572Choose the best answerWhich radioactive emission has the greatest penetrating power?Aα particlesBβ particlesCγ raysDPositive rays Like 0 Discuss 0Share
Carboxylic AcidsHydrogen Bonding and Dimerization573Choose the best answerAcetic acid exists as a dimer in benzene because of:ACondensationBThe presence of the –COOH group onlyCThe presence of α-hydrogen atomsDIntermolecular hydrogen bonding Like 0 Discuss 0Share
LiquidsEvaporation574Choose the best answerEvaporation of a liquid can occur:AOnly above its boiling pointBOnly at 100°CCOnly at 0°CDAt all temperatures at which the liquid exists Like 0 Discuss 0Share
StoichiometryGas Volume and Mass Stoichiometry575Choose the best answerIn the reaction: 2NO + O₂ → 2NO₂ 560 cm³ NO₂ is produced at STP (273 K and 1 atm), while 50 mg O₂ remains unused. What were the initial masses of NO and O₂?A0.6 g NO and 0.4 g O₂B0.75 g NO and 0.45 g O₂C6.0 g NO and 4.5 g O₂D0.3 g NO and 0.37 g O₂ Like 0 Discuss 0Share