March 2008 - +2 Chemistry - One Mark Questions - Part 4

25) When pH of a solution is 2, the hydrogen ion concentration in moles litre^-1 will be

a) 1 X 10^-12
b) 1 X 10^-4
c) 1 X 10^-7
d) 1 X 10^-2

26) Silver obtained from silver coin is purified by fusion with

a) AgNO₃
b) HNO₃
c) H₂SO₄
d) borax

27) Alloys of lanthanides are called as

a) plate metals
b) actinides
c) misch-metals
d) metalloids

28) The common oxidation state of actinide is

a) +2
b) +3
c) +4
d) +6

29) [ FeF₆]^4- is paramagnetic because

a) F^- is a weaker ligand
b) F^- is a stronger ligand
c) F^- is a chelatlng ligand
d) F^- is a flexidentate ligand

30) In nuclear reaction ............... ... is / are balanced on both sides

a) mass
b) number of atoms
c) mass number
d) atomic number and mass number

Check out the answers below.

1) (c)
2) (b)
3) (a)
4) (d)
5) (a)
6) (c)
7) (a)
8) (b)
9) (c)
10) (a)
11) (b)
12) (d)
13) (c)
14) (b)
15) (c)
16) (c)
17) (b)
18) (d)
19) (a)
20) (c)
21) (d)
22) (a)
23) (c)
24) (b)
25) (d)
26) (d)
27) (c)
28) (b)
29) (a)
30) (d)