1 . Mg CO 3 decomposes at a lower temperature than SrCO 3 because: A ) Mg 2+ is

ID: 784515 • Letter: 1

Question

1.Mg CO3 decomposes at a lower temperature than SrCO3 because:

A ) Mg2+ is amphoteric, Sr2+ is not B) Mg2+ is more polarizing than Sr2+

C) Sr2+ is more polarizing than Mg2+ D) Sr2+ shows evidence of the inert pair effect

E) MgCO3 is a polymer, SrCO3 is not

2. Which pair is given in order of decreasing size?

A) Cl-, Clo B) Sr, Ca C) I-, Br- D) K, K+ E) none of these

3. sp:

A) 0 B) 2 C) 3 D) 4 E) 5

4. The outer shell, valence configuration for Co in CoBr4-2 is:

A) s2 B) d2 C) d4 D) s1d1 E) d0

5. The Bond order for N2is:

A) 1.0 B) 2.0 C) 3.0 D) 2.5 E) 1.5

1) mg+2 has small size sr+2 is big ion

we have big ion stabilises big small stabilises small rule for lattice energy

s melting point depends on inter molecular force mgco3 because of polarisation of small mg +2 ion has less melting point

2)b,c,d

3)2,3 are possible

4)it has Co+2 ion having valence configuration=d7 atomic no is 27 remove elctrons from 4s

5)bond order is 3

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