I intend to post 20 MCQs everyday....You all have just revised the complete syllabus...so it should take just 10 minutes to solve them...
Multiple Choice
questions
- Which sample of water will have the lowest vapour pressure:
(1)
100ml at 50°C
(2)
200ml at 30°C
(3)
300ml at 40°C
(4)
400ml at 20°C
(5)
100ml at 45°C
2. Which
type of matter is composed of two or more different elements that are
chemically combined in a definite ratio?
(1)
a solution
(2)
a compound
(3)
a colloidal solution
(4)
a homogeneous mixture
(5)
a heterogeneous mixture
3.
Which list of particles is in order of increasing mass?
(1) proton ®electron ®alpha particle
(2) proton ®alpha particle ®electron
(3) electron ® proton
®alpha particle
(4) alpha
particle ®electron
®proton
(5) alpha
particle ®proton
®electron
4. How many ozone
molecules are in 3.20 g of O3?
(1)
4.0 × 1022
(2)
6.0 × 1022
(3)
1.2 × 1023
(4)
6.0 × 1023
(5)
4.0 × 1021
5. 1.0 M aqueous
solutions of AgNO3, Cu(NO3)2 and Au(NO3)3
are electrolyzed
in the apparatus shown, so the same amount of electricity passes through
each solution. If 0.10 moles of solid
Cu are formed how many moles of Ag and Au are formed?
(1)
0.10 moles Ag, 0.10 moles Au
(2)
0.05 moles Ag, 0.075 moles Au
(3)
0.05 moles Ag, 0.15 moles Au
(4)
0.02 moles Ag, 0.02 moles Au
(5)
0.20 moles Ag, 0.067 moles Au
6. When
forming covalent bonds, which atom can have more than eight valence electrons?
(1)
H
(2)
N
(3)
Na
(4)
F
(5)
Cl
7. Which
diatomic molecule has the shortest bond length?
(1)
N2
(2)
Cl2
(3)
O2
(4)
F2
(5)
S2
8. Which species is nonpolar?
(1)
HCl
(2)
OCl2
(3)
H2O
(4)
NCl3
(5)
CCl4
9. In which species
are all the carbon atoms considered to be sp2 hybridized?
(1)
C2H2
(2)
C4H8
(3)
C3H8
(4)
C6H6
(5)
C4H10
10. How many sigma
bonds does a molecule of ethene have?
(1)
1
(2)
4
(3)
5
(4)
7
(5)
3
11. Which species is isoelectronic with NO2+?
(1)
N2O
(2)
NO2–
(3)
NH2–
(4)
SO2
(5)
SO3
12. The concept of resonance is used to describe molecular
structures which
(1)
oscillate between two
structures.
(2)
have mirror images.
(3)
can be isolated in several
isomeric forms.
(4)
have more than one possible
Lewis structure.
(5)
Have free rotation about single
bonds
13. What are the signs of ∆H° and ∆S° for a reaction that is spontaneous at
all temperatures?
∆H° ∆S°
(1)
+ +
(2)
+ –
(3)
– +
(4)
– –
(5)
Both (1) and (3)
14.
Which change
occurs with the largest increase in entropy at 25°C?
(1)
Br2(l) → Br2(g)
(2)
H2O(l) → H2O(s)
(3)
C(graphite) → C(diamond)
(4)
H2O(s) → H2O(l)
(5)
HCl(g) + H2O(l) → H3O+(aq) + Cl–(aq)
15. Which combination of
solutions of HCl and NaOH would produce the largest ∆T?
(1)
50 mL of 1 M HCl with 50 mL of 1 M NaOH
(2)
50 mL of 2 M HCl with 50 mL of 2 M NaOH
(3)
100 mL of 1 M HCl with 50 mL of 2 M NaOH
(4)
100 mL of 1 M HCl with 100 mL of 1 M NaOH
(5)
100 mL of 1 M HCl with 50mL of 1 M NaOH
16. How is the vapor pressure of a liquid in a closed container
affected when the quantity of liquid
is doubled at constant temperature?
(1)
The vapor pressure increases.
(2)
The vapor pressure decreases.
(3)
It cannot be determined
(4)
The vapor pressure remains the same.
(5)
The vapor pressure may increase or decrease,depending on the
liquid.
17. Oxygen, which is 16 times
as dense as hydrogen, diffuses
(1)
1/16 times as fast.
(2)
1/4 times as fast.
(3)
4 times as fast.
(4)
16 times as fast.
(5)
8 times
18. The mass of 560 cm3
of a gas at 0°C and 1 atm is 1.60g.Which gas could it be?
(1)
O2
(2)
CO2
(3)
SO2
(4)
N2
(5)
Cl2
19.
What is the
correct order when the substances O2, H2O,OF2,
and H2O2 are arranged in order of increasing oxidation
number for oxygen?
(1)
O2, H2O, OF2, H2O2
(2)
H2O, H2O2, O2, OF2
(3)
H2O2, O2, H2O, OF2
(4)
OF2, O2, H2O2, H2O
(5)
H2O, OF2, H2O2 ,O2
20. Under which conditions will
a gas behave most ideally?
(1)
0°C and 1 atm
(2)
low P and high T
(3)
low P and low T
(4)
high P and low T
(5)
high P and high T
No comments:
Post a Comment