Objective Questions

Questions (1872)

#	Question	Topic	Actions
401	The weight of a millimole of (NH₄)₂HPO₄ is: [N=14; H=1; P=31; O=16]	CHM 101 Past Questions	View
402	Which of the following statements is correct?	CHM 101 Past Questions	View
403	A 25.0 mL of an H₂SO₄ solution is titrated with 35.65 mL of a 0.1095 M standard…	CHM 101 Past Questions	View
404	When the equation Fe²⁺ + Cr₂O₇²⁻ → Fe³⁺ + Cr³⁺ is balanced in an acidic medium,…	CHM 101 Past Questions	View
405	How many moles of ammonium ions are in 8.776 g of ammonium carbonate (NH₄)₂CO₃?…	CHM 101 Past Questions	View
406	A compound has the following composition 48.64% carbon, 8.16% hydrogen, and 43.…	CHM 101 Past Questions	View
407	How many moles of KBrO₃ are required to prepare 0.0700 moles of Br₂ according t…	CHM 101 Past Questions	View
408	What volume of water must be added to 200 mL of 0.75 M HCl to dilute the soluti…	CHM 101 Past Questions	View
409	Silicon carbide, an abrasive, is made by the reaction of silicon dioxide with g…	CHM 101 Past Questions	View
410	Calculate the number of moles contained in 2.25 g of Mg(NO₃)₂ [Mg=24; N=14; O=1…	CHM 101 Past Questions	View
411	The success of science is not that of a particular method but more of attitude …	CHM 101 Past Questions	View
412	What is the significance of the behaviour of particles in the gold foil experim…	CHM 101 Past Questions	View
413	Which of these compounds does NOT belong to a homologous series?	CHM 101 Past Questions	View
414	For the following reaction, DP(CH₄)/Dt was found to be -6.2 × 10⁻³ atm/s. CH₄(g…	CHM 101 Past Questions	View
415	Lead ions can be precipitated from aqueous solutions by the addition of aqueous…	CHM 101 Past Questions	View
416	Determine the number of significant figures in the following measurements: 345 …	CHM 101 Past Questions	View
417	Which of the following affects the value of the solubility product, Ksp, of sil…	CHM 101 Past Questions	View
418	A certain first-order reaction A → B is 25% complete in 42 min at 25 °C. What i…	CHM 101 Past Questions	View
419	The difference between fractional distillation and simple distillation apparatu…	CHM 101 Past Questions	View
420	Which statement correctly describes an endothermic chemical reaction?	CHM 101 Past Questions	View
421	One of the following statement is not true about observation	CHM 101 Past Questions	View
422	How many grams of MgCl₂ is needed to obtain 5.0 × 10²³ ions? (Mg=24, Cl=35.5)	CHM 101 Past Questions	View
423	Which statement is true for the combustion of ethanol? C₂H₅OH(l) + 3O₂(g) → 2CO…	CHM 101 Past Questions	View
424	What was the behaviour of most of the particle shot at the gold foil?	CHM 101 Past Questions	View
425	The idea that atoms of the same elements are exactly alike and atoms of differe…	CHM 101 Past Questions	View
426	Which options contains 3 significant figures?	CHM 101 Past Questions	View
427	Two moles of compound P were placed in a vessel. The compound P was partly deco…	CHM 101 Past Questions	View
428	A 25.5 mL aliquot of HCl(aq) of unknown concentration was titrated with 51.2 mL…	CHM 101 Past Questions	View
429	Hypothesis is a statement that	CHM 101 Past Questions	View
430	Which of the following pairs of aqueous solutions, when mixed, would result in …	CHM 101 Past Questions	View
431	When in the sharing of electrons between two atoms in organic compounds the bon…	CHM 101 Past Questions	View
432	Who debunked the idea of Democritus about atom?	CHM 101 Past Questions	View
433	The atomic masses of Cl (75.53%) and (24.47%) are 34.968 amu and 36.956 amu res…	CHM 101 Past Questions	View
434	Which of the following statements is true for electrochemical cell?	CHM 101 Past Questions	View
435	What is the difference between Democritus and Dalton's idea?	CHM 101 Past Questions	View
436	A zinc-copper cell can be written as	CHM 101 Past Questions	View
437	Which of these hydrocarbons are most likely to be soluble in water?	CHM 101 Past Questions	View
438	Which of the following is true for an electrolytic cell?	CHM 101 Past Questions	View
439	How many moles does 1.23 × 10²³ molecules of CaCl₂ represent?	CHM 101 Past Questions	View
440	The reaction A + 2B → products was found to follow the rate law: rate = k[A][B]…	CHM 101 Past Questions	View
441	What was Aristotle's idea about atoms?	CHM 101 Past Questions	View
442	How many equivalent hybrid orbitals are present in sp²-hybridised carbon?	CHM 101 Past Questions	View
443	The kinetic energy of a 7.3 kg steel ball traveling at 18.0 m/s is ___ J.	CHM 101 Past Questions	View
444	If the equilibrium constant for the reaction: A + 2B ⇌ C + 5/2 D has a value of…	CHM 101 Past Questions	View
445	The reaction A + 2B → products was found to follow the rate law: rate = k[A][B]…	CHM 101 Past Questions	View
446	_____ is an oxidation reaction.	CHM 101 Past Questions	View
447	Sorbitol used as a sweetener in some 'sugar-free' foods, has a molecular mass o…	CHM 101 Past Questions	View
448	For the reaction 3A + B → 2C, the rate law is rate = k[A]²[B]. If [A] is triple…	CHM 101 Past Questions	View
449	In which of the following processes does entropy decrease?	CHM 101 Past Questions	View
450	Which process is most likely to be spontaneous at room temperature?	CHM 101 Past Questions	View
451	What does a negative value of ΔS indicate?	CHM 101 Past Questions	View
452	When a reaction is non-spontaneous under standard conditions, what could make i…	CHM 101 Past Questions	View
453	Which of the following will increase entropy?	CHM 101 Past Questions	View
454	In the equation ΔG = ΔH - TΔS, which term reflects the effect of temperature?	CHM 101 Past Questions	View
455	Which of the following reactions shows both positive ΔH and positive ΔS?	CHM 101 Past Questions	View
456	If a reaction has ΔH < 0 and ΔS < 0, under what conditions is it spontaneous?	CHM 101 Past Questions	View
457	A decrease in Gibbs free energy (ΔG < 0) indicates:	CHM 101 Past Questions	View
458	Which of the following is a characteristic of non-spontaneous processes?	CHM 101 Past Questions	View
459	A reaction with ΔG = +40 kJ/mol is:	CHM 101 Past Questions	View
460	The term 'entropy' is best described as:	CHM 101 Past Questions	View
461	Which of the following statements best defines Hess's Law?	CHM 101 Past Questions	View
462	In an exothermic reaction, which of the following is true?	CHM 101 Past Questions	View
463	What is the standard enthalpy of formation of an element in its most stable for…	CHM 101 Past Questions	View
464	When one mole of a substance burns in excess oxygen, the heat change is called:	CHM 101 Past Questions	View
465	The enthalpy change when one mole of an ionic compound forms from its gaseous i…	CHM 101 Past Questions	View
466	What is the unit of enthalpy change in the SI system?	CHM 101 Past Questions	View
467	Which condition defines standard state for thermodynamic calculations?	CHM 101 Past Questions	View
468	Which thermodynamic quantity is path-dependent?	CHM 101 Past Questions	View
469	The energy required to break one mole of a bond in a gaseous substance is:	CHM 101 Past Questions	View
470	Which of the following processes is endothermic?	CHM 101 Past Questions	View
471	The heat change when one mole of water forms from H₂(g) and O₂(g) is:	CHM 101 Past Questions	View
472	In an adiabatic process, which of the following occurs?	CHM 101 Past Questions	View
473	Which expression correctly represents the First Law of Thermodynamics?	CHM 101 Past Questions	View
474	Which of the following is not a valid assumption of calorimetry?	CHM 101 Past Questions	View
475	Enthalpy of neutralization for a strong acid and strong base is approximately:	CHM 101 Past Questions	View
476	The value of enthalpy change for a reaction is affected by:	CHM 101 Past Questions	View
477	If ΔH is positive and ΔS is negative, the reaction is:	CHM 101 Past Questions	View
478	What does the term 'heat capacity' refer to?	CHM 101 Past Questions	View
479	Which of the following is a direct application of Hess's Law?	CHM 101 Past Questions	View
480	For which of the following processes is ΔH = 0?	CHM 101 Past Questions	View
481	The total enthalpy change in a reaction depends on:	CHM 101 Past Questions	View
482	What is the main reason why chemical equations must be balanced?	CHM 101 Past Questions	View
483	In the equation CH₄ + 2O₂ → CO₂ + 2H₂O, what are CH₄ and O₂ collectively called?	CHM 101 Past Questions	View
484	Which of the following cannot be changed while balancing a chemical equation?	CHM 101 Past Questions	View
485	What is the coefficient of O₂ in the balanced reaction: 2KClO₃ → 2KCl + __ O₂?	CHM 101 Past Questions	View
486	In stoichiometric calculations, what must be ensured before proceeding?	CHM 101 Past Questions	View
487	What mass of O₂ reacts with 96.1 g of propane (C₃H₈) based on the stoichiometry…	CHM 101 Past Questions	View
488	From the equation 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O, how many moles of CO₂ are prod…	CHM 101 Past Questions	View
489	Which compound is the limiting reagent if 35 kg of N₂ reacts with 15 kg of H₂ i…	CHM 101 Past Questions	View
490	In the equation N₂ + 3H₂ → 2NH₃, how many grams of H₂ are needed to react with …	CHM 101 Past Questions	View
491	Which of the following statements about limiting reagents is true?	CHM 101 Past Questions	View
492	What is the theoretical yield of Li₃N when 12.3 g of Li is reacted with excess …	CHM 101 Past Questions	View
493	If the actual yield of Li₃N in a reaction is 5.89 g and the theoretical yield i…	CHM 101 Past Questions	View
494	According to the balanced reaction: 2NO + O₂ → 2NO₂, how many moles of NO₂ are …	CHM 101 Past Questions	View
495	The percentage yield is defined as:	CHM 101 Past Questions	View
496	What is the mass of 1 mole of propane (C₃H₈)?	CHM 101 Past Questions	View
497	A reaction involving 2 slices of bread and 1 egg per toast yields 10 toasts wit…	CHM 101 Past Questions	View
498	The term 'yield' in a chemical reaction specifically refers to:	CHM 101 Past Questions	View
499	In the reaction NaHCO₃ + C₆H₈O₇ → CO₂ + H₂O + Na₃C₆H₅O₇, what is produced along…	CHM 101 Past Questions	View
500	The balanced chemical equation ensures:	CHM 101 Past Questions	View

Page 5 of 19

Quick Actions

Practice

Learning Tools

Stats & Progress

Community

Questions (1872)