Exam No 2 CHE 1013-PO2 Name Each of the next questions is graded over 5 points.

Question

Exam No 2 CHE 1013-PO2 Name Each of the next questions is graded over 5 points. 10-20-2017 Answer 90 points. 1) Which one of the following statements regarding a strong base is correct? A. A strong base ionizes in water to produce hydronium ions (H') B. A strong base is highly concentrated. C.NHs (ammonia) is a strong base. D. A strong base ionizes completely in water. E. A strong base neutralizes water 2) Which of this calcium compounds is insoluble? A. CaCl B. CaSO4 C. CaBr D. Ca(NO,h e. Ca(CH,CO0) 3) In a redox process between a metal and nonmetal elements, which one is true A. The metal is reduced C. the nonmetals gains electronsD the oxidation state of the metal turns negative B. the metal gains electrons E, the oxidation state of the nonmetal turns positive 4) Find the right statement regarding oxidation and reduction A. Oxidation is the process by which a chemical species loses electrons. B. Elements close to the noble gases group usually undergo oxidations C. Nonmetals usually undergo oxidation D. Metals usually undergo reductions E. Oxidation is the process in which a chemical species gains electrons. 5) Which of the following contains the smallest number of atoms? A. 1 mol water (H:O) C. 1 mol nitrogen dioxide (NO) D. I mol carbon monoxide (Co) E. 1 mol of carbon dioxide (CO) 6) 1.00 mole of Cl: contains the same number of molecules as A. 0.5 moles of CIO C. 2.00 moles of B. I mol phosphorus pentachloride (PCI,) B. 0.5 moles of N,0, H D. 2 moles of Cl:O E. 1.00 mole of H,O. 7) The oxidation number of sulfur in sulfur trioxide SO, is A.-2 B. 0 D. +4 8) Which species get oxidized? Fe(s) + Cu2"(aq) Cu(s) + Fe" (aq) A. HOB. Cu(s) C. Fe(s) D.Cu (aq) 9) In the evaluation of yields of reactions which one is true? A the theoretical yield is calculated from the amount of excess reactant B. the actual yield is calculated from the amount of limiting reactant C. the theoretical yield is found experimentally D. the experimental yield ofa reaction can not be more than 100% E, the theoretical yield is usually greater than 100% CHEM-1013-P02

Explanation / Answer

1) answer is d. - ,strong base means more number of OH- ion

2) b.CaSO4 As its ionic producs is more compare to.ksp

3) c . Non metal gains electron and it reduced and get negative charge.

4) a. As metal looses electron and get positive charge

5) d. As in one molecule of CO only two atoms are there carbind and oxygen

6) c. 2 moles of H . As cl2 contain 2 atom per molecule.

7) e. +6 , as oxygen has - 2 charge and total -6 as, 3 atoms are der

8) c. Fe as it looses two electrone and get + 2 charge.

9) B. As yield is always depend on limiting reagent which limit the reaction.

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