Objective Questions

Questions (1872)

#	Question	Topic	Actions
501	From the stoichiometry 1 mole of C₃H₈ reacts with 5 moles of O₂, how many moles…	CHM 101 Past Questions	View
502	In stoichiometry, a mole ratio is derived from:	CHM 101 Past Questions	View
503	The idea that atoms of the same elements are exactly alike and atoms of differe…	CHM 101 Past Questions	View
504	If the standard enthalpies of formation of HBr(g) and Br₂(g) are -36 and +31 kJ…	CHM 101 Past Questions	View
505	For which system does the equilibrium constant, K, have the units of (concentra…	CHM 101 Past Questions	View
506	Gases can be compressed because	CHM 101 Past Questions	View
507	What eventually happens to a gas if its pressure is increased?	CHM 101 Past Questions	View
508	Silver ions can be precipitated from aqueous solutions by the addition of aqueo…	CHM 101 Past Questions	View
509	In an electrochemical cell, electrons travel in which direction?	CHM 101 Past Questions	View
510	The reaction A + 2B → products has been found to have the rate law, rate = k[A]…	CHM 101 Past Questions	View
511	The reaction A + 2B → products was found to have the rate law, rate = k[A]²[B].…	CHM 101 Past Questions	View
512	The statement 'Particles can only vibrate with respect to each other' is true f…	CHM 101 Past Questions	View
513	The standard enthalpy of formation of NH₃(g) at 298 K is -46 kJ mol⁻¹. Which of…	CHM 101 Past Questions	View
514	Which statement below correctly identifies the difference between laws and theo…	CHM 101 Past Questions	View
515	Which statement is true for the reaction: (Image likely shows Cr₂O₇²⁻ with HSO₃…	CHM 101 Past Questions	View
516	The carbon content in an organic compound can be detected by......	CHM 101 Past Questions	View
517	Choose the most stable alkene	CHM 101 Past Questions	View
518	Which of the bonds of a carbon-carbon double bond has more effective orbital-or…	CHM 101 Past Questions	View
519	In a reaction between CH₃CH₂CH=CH₂ and HBr, the Markovnikov's product is?	CHM 101 Past Questions	View
520	Components are indistinguishable in which type of mixture?	CHM 101 Past Questions	View
521	What is the mass percent composition of fluorine in haloethane (C₂HBrClF₃)? (Du…	CHM 101 Past Questions	View
522	Each of the following equilibria is subjected to two changes carried out simult…	CHM 101 Past Questions	View
523	Repeated observations in an experiment gave the values 1.29, 1.33, 1.34, 1.35, …	CHM 101 Past Questions	View
524	A theory is	CHM 101 Past Questions	View
525	Which of the following is characteristic of homogenous mixture;	CHM 101 Past Questions	View
526	When the system A + B ⇌ C + D is at equilibrium,	CHM 101 Past Questions	View
527	In the reaction (glucose combustion), if 856 g of glucose is consumed by a pers…	CHM 101 Past Questions	View
528	Atoms of different elements combine in simple whole number ratio to form chemic…	CHM 101 Past Questions	View
529	The ΔH for the solution process when solid sodium hydroxide dissolves in water …	CHM 101 Past Questions	View
530	Democritus and Aristotle were both...........	CHM 101 Past Questions	View
531	If Carbon-12 has a relative abundance of 98.89%, Carbon-13 has a relative abund…	CHM 101 Past Questions	View
532	Consider the following reversible reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g). In a 3.00…	CHM 101 Past Questions	View
533	What happens to the value of ΔH for a thermochemical reaction if the reaction i…	CHM 101 Past Questions	View
534	Oxidation and reduction reactions have all the following attributes except	CHM 101 Past Questions	View
535	In which reaction does the oxidation number of hydrogen change?	CHM 101 Past Questions	View
536	What quantity of heat is evolved when 5.550 mol H₂O(l) is formed from the combu…	CHM 101 Past Questions	View
537	C-H bonds are usually considered non-polar because the electronegativity value …	CHM 101 Past Questions	View
538	Nitric oxide reacts with chlorine to form nitrosyl chloride, NOCl. Use the foll…	CHM 101 Past Questions	View
539	Evolvement of theories imply	CHM 101 Past Questions	View
540	Appropriate units for a first-order rate constant are	CHM 101 Past Questions	View
541	For the hypothetical reaction A + 3B → 2C, the rate of appearance of C given by…	CHM 101 Past Questions	View
542	The oxidation and reduction process involves	CHM 101 Past Questions	View
543	One of the following is not a characteristic of a theory.	CHM 101 Past Questions	View
544	Convert 23.5°C to °F	CHM 101 Past Questions	View
545	Nitric oxide reacts with chlorine to form nitrosyl chloride, NOCl. Use the foll…	CHM 101 Past Questions	View
546	If the standard enthalpies of formation of HBr(g) and Br(g) are -36 and +31 kJ …	CHM 101 Past Questions	View
547	Which statement is true for the reaction: Cr₂O₇²⁻ + 3HSO₃⁻ + 8H⁺ → 2Cr³⁺ + 3SO₄…	CHM 101 Past Questions	View
548	A solution of ethanoic acid of concentration 0.01 mol dm⁻³ has a pH of 3.38. Ca…	CHM 101 Past Questions	View
549	For the reaction C₆H₁₄(g) → C₆H₆(g) + 4H₂(g), DP(H₂)/Dt was found to be 2.5 × 1…	CHM 101 Past Questions	View
550	In the reaction C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, if 856 g of glucose is consumed by…	CHM 101 Past Questions	View
551	The ΔH for the solution process when solid sodium hydroxide dissolves in water …	CHM 101 Past Questions	View
552	Which of the following is characteristic of a homogeneous mixture?	CHM 101 Past Questions	View
553	How many grams of MgCl₂ is needed to obtain 5.0 × 10²³ ions?	CHM 101 Past Questions	View
554	For the overall chemical reaction shown below, which one of the following state…	CHM 101 Past Questions	View
555	Who proposed the first atomic theory based on the idea that atoms are indivisib…	CHM 101 Past Questions	View
556	As you move from the top to the bottom of the periodic table:	CHM 101 Past Questions	View
557	Calculate the kinetic energy in J of an electron moving at 6.00×10^6 m/s. The m…	CHM 101 Past Questions	View
558	What defines a conjugate acid-base pair?	CHM 101 Past Questions	View
559	The most important factor in determining the variation in size of atoms as you …	CHM 101 Past Questions	View
560	Which of the following is a redox reaction?	CHM 101 Past Questions	View
561	The reaction 4Al (s) + 3O₂ (g) → 2Al₂O₃ (s) ΔH° = -3351 kJ is ______, and there…	CHM 101 Past Questions	View
562	What is the concentration (M) of KCl in a solution made by mixing 25.0 mL of 0.…	CHM 101 Past Questions	View
563	The Brønsted base in H₃O⁺ + HCl → H₃O⁺ + Cl⁻ is which?	CHM 101 Past Questions	View
564	What is the correct order of orbital filling according to the Aufbau principle?	CHM 101 Past Questions	View
565	Forces that occur when the partially positively charged part of a molecule inte…	CHM 101 Past Questions	View
566	Which of the following represents the correct oxidation half-equation from the …	CHM 101 Past Questions	View
567	What combination of quantum numbers violates the Pauli exclusion principle?	CHM 101 Past Questions	View
568	The mixing of two or more atomic orbital of the same energy level to form a hyb…	CHM 101 Past Questions	View
569	Calculate the change in entropy for the reaction (ΔS°): 2 SO₂(g) + O₂(g) → 2 SO…	CHM 101 Past Questions	View
570	Which indicator is used in strong acid–strong base titration?	CHM 101 Past Questions	View
571	Which of the following accurately describes isotopes of an element?	CHM 101 Past Questions	View
572	A quantity of HI was sealed in a tube, heated to 425 °C and held at this temper…	CHM 101 Past Questions	View
573	Which principle is used to determine the electronic configuration of elements?	CHM 101 Past Questions	View
574	A sample of iron receives 50. J of heat energy that raises the temperature of t…	CHM 101 Past Questions	View
575	What is the number of moles present in a 159 g sample of alanine C₃H₇NO₂? [C=12…	CHM 101 Past Questions	View
576	The number of microstates Ω for a system is 100. Using the Boltzmann constant k…	CHM 101 Past Questions	View
577	The value of ΔU for a system that performs 213 kJ of work on its surroundings a…	CHM 101 Past Questions	View
578	What was the main limitation of Democritus's atomic theory?	CHM 101 Past Questions	View
579	For what order reaction does the half-life get longer as the initial concentrat…	CHM 101 Past Questions	View
580	The term 'mole' in chemistry refers to:	CHM 101 Past Questions	View
581	Which unit is commonly used to express molar mass?	CHM 101 Past Questions	View
582	What is the molar volume of an ideal gas at STP (Standard Temperature and Press…	CHM 101 Past Questions	View
583	Which of these statements is true about chemical symbols?	CHM 101 Past Questions	View
584	Which of the following subatomic particles is negatively charged?	CHM 101 Past Questions	View
585	How many protons, neutrons, and electrons are present in the isotope ³⁹₁₉K?	CHM 101 Past Questions	View
586	An example of good electrical conductor is	CHM 101 Past Questions	View
587	Which statement is true for the combustion of ethanol? C₂H₅OH (l) + 3O₂(g) → 2C…	CHM 101 Past Questions	View
588	For which system does the equilibrium constant, K, has the units of (concentrat…	CHM 101 Past Questions	View
589	One of the characteristics of atoms as proposed by Democritus is that they.....	CHM 101 Past Questions	View
590	Which of the following element is the backbone of organic compounds?	CHM 101 Past Questions	View
591	Adenosine triphosphate (ATP) is the main energy storage molecule in cells. Its …	CHM 101 Past Questions	View
592	Alkynes cleave in the presence of ozone to give	CHM 101 Past Questions	View
593	The scientific process includes all except	CHM 101 Past Questions	View
594	If 257.8 mL of a 0.0468 M solution of lead nitrate is added to 156.00 mL of a 0…	CHM 101 Past Questions	View
595	Which of the following compounds can exist as a geometrical isomer?	CHM 101 Past Questions	View
596	Who gave the name cathode to the positive electrode?	CHM 101 Past Questions	View
597	On industrial scale, sodium metal is prepared by electrolysis of fused	CHM 101 Past Questions	View
598	What is the correct order of the steps in the scientific method?	CHM 101 Past Questions	View
599	Democritus and Aristotle were both..........	CHM 101 Past Questions	View
600	...........proposed that atoms cannot be created, divided or destroyed.	CHM 101 Past Questions	View

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