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916
A mixture of 0.20 mole of Ar, 0.20 mole of N
2
and 0.30 mole of He exerts a total pressure of 2.1 atm. The partial pressure of He in the mixture is?
A.
0.90 atm
B.
0.80 atm
C.
0.70 atm
D.
0.60 atm
View Answer & Discuss (6)
JAMB 1997
917
The temperature of a body decreases when drops of liquid placed on it evaporate because?
A.
the atmospheric vapour pressure has a cooling effect on the body
B.
a temperature gradient exists between the drops of liquid and the body causing the latter to vaporate
C.
the heat of vapourization is drawn from the body causing it to cool
D.
the random motion of the liquid molecules causes a cooling effect on the body
View Answer & Discuss (4)
JAMB 1997
918
The electron configuration of two elements with similar chemical properties are represented by?
A.
1s
2
2s
2
2p
5
and 1s
2
2s
2
2p
4
B.
1s
2
2s
2
2p
4
and 1s
2
2s
2
2p
6
3s
1
C.
1s
2
2s
2
2p
6
3s
1
and 1s
2
2s
1
D.
1s
2
2s
2
2p
4
and 1s
2
2s
1
View Answer & Discuss (9)
JAMB 1997
919
In the periodic table, what is the property that decreases along the periodic and increases down the group?
A.
Atomic number
B.
Electron affinity
C.
Ionization potential
D.
Atomic radius
View Answer & Discuss (10)
JAMB 1997
920
Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound P
x
Q
Y
. The respective values of x and y are?
A.
1 and 1
B.
1 and 2
C.
2 and 1
D.
3 and 1
View Answer & Discuss (5)
JAMB 1997
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