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4421. Consider the given balanced chemical equation: 2H2 + O2 = 2H2O. If 4 g of H2 reacts with 32 g of O2 to produce 28 g of H2O, what is the percentage yield of the reaction? (Molar mass of H2 = 2 g/mol, O2 = 32 g/mol and H2O = 18 g/mol)



4422. Amount of energy needed to weaken the existing bonds to an extent that can be broken through collision is called:



4423. Oxidation numbers of X,Y,Z are +6, -2, & -1 respectively, possible molecular formula when atoms combine:



4424. Which set of quantum numbers is not allowed for an electron.



4425. 2A+B=3C+D which of the following does not express the reaction rate?



4426. The order of ease of reduction of H+, Cu++, and Ag++:



4427. Acetaldehyde undergoes oxidation to produce acetic acid, in this reaction oxidizing agent used is:



4428. Which one of the following has higher vapour pressure?



4429. Terminal alkynes show acidic character due to:



4430. Fischer ESTERIFICATION is which type of reaction:



4431. Shape of orbital is determined by quantum number:



4432. The theories which explain the formation of sigma and pi bond are EXCEPT:



4433. The value of Planck's constant is:



4434. Final equation for the representation of rate of reaction in (ctrr) of concentration is called :



4435. Poly vinyl chloride (PVC) is the type of?



4436. Which of the following is true about pressure for an ideal gas at -273°C?



4437. Which of the following is basic buffer?



4438. What happens when H+ is added to ammonium hydroxide and ammonium chloride buffer?



4439. What is general requirement for free radical substitution reaction of ethane and halogen?



4440. Which one of the following is not a characteristic of benzene?



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