ation JU- Choose the correct answer(s): (2 pt each) I- Which of the following is

Question

ation JU- Choose the correct answer(s): (2 pt each) I- Which of the following is the correct formaula of Sodium Bromide? a) SBa b) SoBe e) NaBr d) NaBr, e) SBr 2- Which of the following is a liquid metal? a) Br b) C c) Co d)Hg e) C 3-1s'2s'2 31#4s' istedectroniccon figuration of a)K b) Sc Sd) CPe) None 4- The following aA and ,,Bte are example of a) Isotopes b) Isobars and Isotopes )Isobars ) Ca isotopes e) none. 5- Each of the following pairs make ionic bond except: 6- Which of the following has the Lowest electronegativity? a) Cl b) P c) Na d) Cs e) F 7- Which of the following has the same electronic configuration as that of Se ion ? a) Krb CI d) Ca e)Mg 8- The compound made from Al and CIO is: a) Al(CIO) ) AI(CIO), d) Al,Cl, e)None 9- Which of the following hás 24 valence electron ? a) so b)Bec e) SO d) TeO eAC, 10- Each of the following has linear molecular shape except: a) Co b)

Explanation / Answer

1) Na Br is sodium bromide

2) Hg is a liquid metal , Hg refers to mercury which is liquid at room temperature

3) it has a total of 21 electrons , so Sc (scandium has 21 electrons as its atomic no is 21)

4) here A and B are isobars since for isobars they have same atomic mass but different atomic number

5) C , H donot form ionic bond , they show covalent type of bonding

6) Cs (caesium) is the most electropositive among all hence it is the least electropositive

7) kr + , both have same no of electrons

9) AlCl3 has 24 valence electrons

8) none of them are correct as the answer is Al4 ClO3

10) H20 , NH3 ARE NOT LINEAR MOLECULE

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