55. How many e- are there in the 3d orbitals of Ag? (a) 2 (b) 4 (c) 5 (d) 8 (e)

Question

55. How many e- are there in the 3d orbitals of Ag? (a) 2 (b) 4 (c) 5 (d) 8 (e) 10 60. Which element has two natural isotopes, one with atomic weight 34.97 (75,76%) and the other with (a) 2 atomic weight 36.97(24.24%)? (a)S (b) Cl (c) Ar (d) Ge (e) None of the other elements. 56. What is the molarity of a solution made from 0.0500 moles of I2 and enough alcohol to make a total volume of 100 mL? (a) 0.500 M (b) 1 00 M (c) 2.00 M (d) 5.00 M (e) None of the other answers. 57. Flow many moles of CO2 is produced from exactly 9.50 moles of CaCO3 according to the reaction CaCO3(s) right arrow CaO(s) + CO2(g)? (a) 0.50 moles (b) 1.00 moles (c) 4.25 moles (d) 9.50 moles (e) 418 moles 58. What is the chemical formula of hypochlorite? (a) ClO- (b) ClO2- (c) ClO3- (d) ClO4- (e) ClO4^2- 59. Which one of the following statements is true? (a) The limiting reactant can be predicted from the chemical equation and initial amounts of reactants. (b) The limiting reactant partly remains after the reaction has finished. (c) The limiting reactant is the one making the largest amount of product. (d) All reactions contain a limiting reactant. (e) Limiting reactions cannot occur if there are three reactants. Page 7 of 8

Explanation / Answer

55. e) 10
Configuration : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10

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56. a) 0.500 M
Molarity = number of moles/litre
= 0.05/0.1 =0.500 M

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57. d) 9.50 moles

Becuase there is 1-to-1 stoichiometric relation between CaCO3 and CO2 in the reaction.
Hence 9.50 moles give 9.50 moles CO2

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58. a) ClO-

Formula for HYPOCHLORITE

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59. a) The limiting reactant can be predicted from the chemical equation and initial amounts of reactants.

Rest statements are incorrect for a chemical reaction in someway or other

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60. b) Cl

This is the case of chlorine.where isotopic atomic masses are 36.97 and 34.97.

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