1) Which of the statements about sodium is INCORRECT?  a) Sodium becomes an cation ion after losing one electron. b)  Sodium ion is a simple ion derived from a single atom.  c) Sodium would form an ionic bond with oxygen. d) Oxygen would lose 2 electrons to sodium when form an ionic bond. 2) Which of the statements is INCORRECT? a) A cation ion form when a metal loses electron(s). b) A compound with ionic bond is called ionic compound. c) An ionic compound is electrically neutral. d) None of a-c. 3) Which of following about magnesium fluoride is INCORRECT?  a) The electronic arrangement (by numbering) of Mg atom is 2,8,2. b) The electronic arrangement for fluoride ion is 2, 8. c) The chemical formula for magnesium fluoride is MgF. d) Magnesium atom and magnesium ion have same number of protons.  4) Which of the following particles have NO octet structure?  a) H+ b) K+ c) P3- d) O2- 5) The element with atomic number 12 will combine most readily with the element whose atomic number is a) 11 b) 13 c) 16 d) 18 6) Which of the name and formulae of ionic compound are correctly matched?  a) FeSO4 __ Iron sulphate b) Cu(NO3)2 __ Copper (II) nitrite  c) Zn(OH)2 __ Zinc hydroxide d) Ca(I)2 __ Calcium iodine 7) Which of following is NOT a polyatomic ion? a) OH- b) Br- c) NH4+ d) CO32- 8) If the atomic number of an element X is 13, the formula of its oxide is  a) XO2. b) XO3. c) X2O3. d) X3O2. 9) Which of the following combinations is correct? a) Dichromate ion __ purple b) Calcium ion __ colourless c) Iron (II) ion __ brown d) Copper (II) ion __ yellow 10) Which of the following statements about ammonium permanganate is INCORRECT?  a) It is composed of polyatomic ions. b) It is purple in colour. c) It is electrically neutral.  d) None of a-c.

S.3 Chemistry Star Task (March)

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