Objective Questions

Questions (1872)

#	Question	Topic	Actions
601	The standard reduction potential E° for half-reactions are Zn²⁺ + 2e⁻ → Zn E° =…	CHM 101 Past Questions	View
602	What is the ΔH sign for an exothermic energy change?	CHM 101 Past Questions	View
603	In which state of matter do the particles have the most energy?	CHM 101 Past Questions	View
604	The reaction A + 2B → products were found to have the rate law, rate = k[A][B]²…	CHM 101 Past Questions	View
605	A 10.0 ml sample of sulphuric acid from an automobile battery requires 35.08 mL…	CHM 101 Past Questions	View
606	A solution of ethanoic acid of concentration 0.01 mol dm⁻³ has a pH of 3.38. Ca…	CHM 101 Past Questions	View
607	Which kinds of bonding can be found in a sample of H₂O(l)?	CHM 101 Past Questions	View
608	The formation of a π bond in an organic compound is due to	CHM 101 Past Questions	View
609	What is the total number of electrons in the hybridized orbitals of ethene?	CHM 101 Past Questions	View
610	Decrease in oxidation number is	CHM 101 Past Questions	View
611	In the redox couple Cu²⁺/Cu, copper is	CHM 101 Past Questions	View
612	Chemical energy is converted to electrical energy in	CHM 101 Past Questions	View
613	In a battery, the positive electrode is the	CHM 101 Past Questions	View
614	Which of the following is inert in an electrochemical cell?	CHM 101 Past Questions	View
615	Which of the following batteries is non-rechargeable?	CHM 101 Past Questions	View
616	Calculate the electromotive force for a zinc-silver couple at 25 °C, 1 atm, and…	CHM 101 Past Questions	View
617	An unknown compound X with a molecular weight of 90 g/mol was found to contain …	CHM 101 Past Questions	View
618	The compound B. below is H₃C H \ / C=C / \ H CH₃ [Text re…	CHM 101 Past Questions	View
619	The IUPAC nomenclature of the compound below is? [Image of a chloroalkene]	CHM 101 Past Questions	View
620	The equation for the reaction between NO and O₂ is given below 2NO + O₂ → 2NO₂.…	CHM 101 Past Questions	View
621	Nitric oxide reacts with hydrogen to form nitrous oxide, and water. Use the fol…	CHM 101 Past Questions	View
622	The activation energy for the reaction CH₃CO-CH₃ + CO is 71 kJ/mol. How many ti…	CHM 101 Past Questions	View
623	Given that Ea for a certain biological reaction is 48 kJ/mol, and that the rate…	CHM 101 Past Questions	View
624	The rate law for the reaction 2NO₂ + O₃ → N₂O₅ + O₂ is rate = k[NO₂][O₃]. Which…	CHM 101 Past Questions	View
625	The thermal decomposition of nitryl chloride, 2NO₂Cl → 2NO₂ + Cl₂, is thought t…	CHM 101 Past Questions	View
626	Equation of reaction between X and Y is given below X + Y → Products. What is t…	CHM 101 Past Questions	View
627	What is the order of reaction for X + Y → Products?	CHM 101 Past Questions	View
628	A certain first-order reaction A → B is 25% complete in 42 min at 25°C. What is…	CHM 101 Past Questions	View
629	For the chemical reaction A + B → C, a plot of [A] versus time is found to give…	CHM 101 Past Questions	View
630	The Arrhenius equation is: k = A e^(-Ea/RT). The slope of a plot of ln k vs. 1/…	CHM 101 Past Questions	View
631	When vanadium (II) compounds are dissolved in water, the following equilibrium …	CHM 101 Past Questions	View
632	What is the mass percent composition of nitrogen in adenosine triphosphate (C₁₀…	CHM 101 Past Questions	View
633	Alkenes cleave in the presence of ozone followed by reduction to give	CHM 101 Past Questions	View
634	The scientific process includes all of the following except	CHM 101 Past Questions	View
635	If naturally occurring magnesium consists of 78.99% ²⁴Mg (23.985 amu), 10.00% ²…	CHM 101 Past Questions	View
636	If 150.0 mL of a 0.100 M solution of silver nitrate is added to 200.0 mL of …	CHM 101 Past Questions	View
637	What is the mass percent composition of chlorine in chloroethane (C₂H₅Cl)?	CHM 101 Past Questions	View
638	Who discovered the electron?	CHM 101 Past Questions	View
639	On industrial scale, aluminum metal is prepared by electrolysis of	CHM 101 Past Questions	View
640	What is the correct order of steps when designing an experiment?	CHM 101 Past Questions	View
641	Democritus and Leucippus are known for...	CHM 101 Past Questions	View
642	.......... proposed that atoms of the same element are identical in mass and pr…	CHM 101 Past Questions	View
643	The standard reduction potentials are: Cu²⁺ + 2e⁻ → Cu, E° = +0.34 V; Ag⁺ + e⁻ …	CHM 101 Past Questions	View
644	What is the ΔH sign for an endothermic energy change?	CHM 101 Past Questions	View
645	In which state of matter do the particles have the least kinetic energy?	CHM 101 Past Questions	View
646	The reaction 2A + B → products was found to have the rate law, rate = k[A][B]. …	CHM 101 Past Questions	View
647	A 25.0 mL sample of hydrochloric acid requires 18.50 mL of 0.150 M sodium hydro…	CHM 101 Past Questions	View
648	It takes 25.0 min for the concentration of a reactant in a first-order reaction…	CHM 101 Past Questions	View
649	A solution of a weak monoprotic acid of concentration 0.020 M has a pH of 3.…	CHM 101 Past Questions	View
650	Which kinds of intermolecular forces can be found in a sample of CH₃OH(l)?	CHM 101 Past Questions	View
651	The bond angles in a molecule with trigonal planar geometry are approximately:	CHM 101 Past Questions	View
652	A sigma (σ) bond is formed by the:	CHM 101 Past Questions	View
653	In the molecule methane (CH₄), the carbon atom uses which of the following sets…	CHM 101 Past Questions	View
654	An increase in oxidation number is associated with:	CHM 101 Past Questions	View
655	A substance that donates electrons in a redox reaction is called:	CHM 101 Past Questions	View
656	In the half-reaction Fe³⁺ → Fe²⁺, iron is:	CHM 101 Past Questions	View
657	Electrical energy is converted to chemical energy in a:	CHM 101 Past Questions	View
658	In an electrolytic cell, the positive electrode is the:	CHM 101 Past Questions	View
659	The purpose of a salt bridge in an electrochemical cell is to:	CHM 101 Past Questions	View
660	Which of the following is an example of a secondary (rechargeable) cell?	CHM 101 Past Questions	View
661	Calculate the standard electromotive force (EMF) for a cell constructed from a …	CHM 101 Past Questions	View
662	All of the following are methods to prevent corrosion except:	CHM 101 Past Questions	View
663	An unknown compound with a molecular weight of 180 g/mol contains 40.0% carbon,…	CHM 101 Past Questions	View
664	In the molecule 2-butene, the two methyl groups are on opposite sides of the…	CHM 101 Past Questions	View
665	The IUPAC name for the compound with the structure (CH₃)₂C=CHCH₂CH₃ is:	CHM 101 Past Questions	View
666	For the reaction 2NO + Cl₂ → 2NOCl, the rate law is found to be rate = k[NO][Cl…	CHM 101 Past Questions	View
667	For the reaction A + B → C, the following data was obtained: Expt 1: [A]=0.1, […	CHM 101 Past Questions	View
668	A reaction has an activation energy of 50 kJ/mol. How much faster is the reacti…	CHM 101 Past Questions	View
669	The rate constant for a reaction is 2.0 × 10⁻³ s⁻¹ at 25°C and has an activatio…	CHM 101 Past Questions	View
670	A proposed mechanism for a reaction is: Step 1: A → B + C (slow), Step 2: B + D…	CHM 101 Past Questions	View
671	For the elementary step: 2A → B, the molecularity is:	CHM 101 Past Questions	View
672	For the elementary reaction 2NO₂ → N₂O₄, the order of the reaction is:	CHM 101 Past Questions	View
673	A first-order reaction is 50% complete in 30 minutes. What is the half-life of …	CHM 101 Past Questions	View
674	For a second-order reaction, a plot of which function versus time will yield a …	CHM 101 Past Questions	View
675	The Arrhenius equation is k = A e^(-Ea/RT). A plot of ln k vs. 1/T will have an…	CHM 101 Past Questions	View
676	Consider the equilibrium: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) ΔH = -92 kJ. Increasing the …	CHM 101 Past Questions	View
677	The solubility product expression for iron(III) hydroxide, Fe(OH)₃, is:	CHM 101 Past Questions	View
678	For the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), if the initial concentration of PC…	CHM 101 Past Questions	View
679	For the reaction H₂(g) + I₂(g) ⇌ 2HI(g), if 1 mole of H₂ and 1 mole of I₂ are p…	CHM 101 Past Questions	View
680	The pH of a 0.10 M solution of a weak acid is 2.87. What is the Ka of this acid?	CHM 101 Past Questions	View
681	For the reaction H₂(g) + Br₂(g) ⇌ 2HBr(g), Kp is 1.2 × 10⁵ at a certain tempera…	CHM 101 Past Questions	View
682	Calculate the pH of a 0.0050 M solution of Ba(OH)₂, a strong base.	CHM 101 Past Questions	View
683	The solubility of CaF₂ is 2.0 × 10⁻⁴ M at 25°C. What is the Ksp of CaF₂?	CHM 101 Past Questions	View
684	A system that can exchange only energy, but not matter, with its surroundings i…	CHM 101 Past Questions	View
685	Energy transferred as a result of a temperature difference is defined as:	CHM 101 Past Questions	View
686	A gas expands against a constant external pressure of 2.0 atm from 10 L to 25 L…	CHM 101 Past Questions	View
687	The total kinetic and potential energy of the particles within a system is call…	CHM 101 Past Questions	View
688	In chemistry, what is the most important type of potential energy, which arises…	CHM 101 Past Questions	View
689	What is the standard formula used to compute pressure-volume work performed by …	CHM 101 Past Questions	View
690	Calculate the work associated with the expansion of a gas from 46 L to 64 L aga…	CHM 101 Past Questions	View
691	Calculate the quantity of heat absorbed by 15.0 g of water when heated from 20.…	CHM 101 Past Questions	View
692	In an exothermic reaction, which of the following statements is true regarding …	CHM 101 Past Questions	View
693	Which of the following mathematical equations represents the First Law of Therm…	CHM 101 Past Questions	View
694	Calculate ΔU for a system undergoing an endothermic process absorbing 15.6 kJ o…	CHM 101 Past Questions	View
695	An ideal gas is compressed from 400 mL to 60.0 mL against a constant pressure o…	CHM 101 Past Questions	View
696	At constant pressure, the change in enthalpy (ΔH) equals which thermodynamic qu…	CHM 101 Past Questions	View
697	How much heat is released when 4.50 g of methane gas (CH4) undergoes complete c…	CHM 101 Past Questions	View
698	Given 2H2(g) + O2(g) -> 2H2O(l), ΔH = -572 kJ, what is ΔH for the reaction H2(g…	CHM 101 Past Questions	View
699	Given 2H2(g) + O2(g) -> 2H2O(l), ΔH = -572 kJ, what is ΔH for the decomposition…	CHM 101 Past Questions	View
700	A bomb calorimeter operates at constant volume. What thermodynamic quantity doe…	CHM 101 Past Questions	View

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