Chemical EquilibriumActive Mass1831Choose the best answerThe active mass of 64 g of HI present in a 2.0 dm³ flask is approximately:A2.0 mol dm⁻³B1.0 mol dm⁻³C0.50 mol dm⁻³D0.25 mol dm⁻³ Like 0 Discuss 0Share
Sindh MDCAT 2021 Chemistry#Aldehydes and Ketones#Preparation of Formaldehyde1832Choose the best answerThe compound obtained by the dry distillation of calcium formate is:AMethanolBMethanalCMethaneDAcetone Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Quantum Theory1833Choose the best answerIn Planck’s theory, the discrete packets of absorbed or emitted energy are called:AElectronsBQuantaCProtonsDNeutrons Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model1834Choose the best answerWhich expression represents the Rydberg constant?AR = me⁴/8ε₀²h³cBR = me⁴/8ε₀²h²CR = ε₀h²/Zπme²DR = Ze²/4πε₀r Like 0 Discuss 0Share
Basic Concepts of ChemistryElements, Compounds and Mixtures1835Choose the best answerIn known elements, the maximum number is of:AMetalsBNon-metalsCMetalloidsDNone of these Like 1 Discuss 0Share