40.	Select the most acidic compound from the following.

A.

SO2

B.

Al2O3

C.

CaO

D.

PbO

E.

H2O

41.	Select the most basic compound from the following.

A.

Bi2O3

B.

SiO2

C.

Cs2O

D.

Na2O

E.

H2O

42.	Which of the following elements will form a cation with a +2charge?

A.

Si

B.

Sr

C.

Ga

D.

Cs

E.

S

43.	Which of the following ions will be most likely to form whenselenium ionizes?

A.

Se6+

B.

Se4+

C.

Se2+

D.

Se2-

E.

Se4-

44.	Which of the following atoms will be diamagnetic?

A.

Cr

B.

Ru

C.

Fe

D.

Pt

E.

Cd

45.	Which of the following elements is paramagnetic?

A.

Kr

B.

Zn

C.

Sr

D.

V

E.

Ar

46.	Select the paramagnetic ion.

A.

Cu+

B.

Ag+

C.

Fe3+

D.

Cd2+

E.

Ca2+

47.	Select the diamagnetic ion.

A.

Cu2+

B.

Ni2+

C.

Cr3+

D.

Sc3+

E.

Cr2+

48.	Consider the set of isoelectronic atoms and ions A2-,B-, C, D+, and E2+. Whicharrangement of relative radii is correct?

A.	A2- > B- > C > D+ >E2+

B.	E2+ > D+ > C > B- >A2-

C.	A2- > B- > C < D+ 2+

D.	A2- < B- < C > D+ >E2+

E.	None of these is correct.

49.	What is the correct order of decreasing size of the followingions?

A.	P3- > Cl- > K+ >Ca2+

B.	Ca2+ > K+ > Cl- >P3-

C.	K+ > Cl- > Ca2+ >P3-

D.	K+ > Cl- > P3- >Ca2+

E.	None of these is correct.