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1.
The periodic classification of the elements is an arrangement of the elements in order of their
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A.
atomic weights
B.
isotopic weights
C.
molecular weights
D.
atomic numbers

2.
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water, and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be
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A.
2.2 M
B.
1.1 M
C.
0.22 M
D.
0.11 M

3. q-image

In the above experiment (Fig. 1) the litmus paper will initially

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A.

be bleached

B.

turn green

C.

turn red

D.

turn blue


4.
A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg. Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
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A.
Al and Mg
B.
Zn and Fe
C.
Zn and Pb
D.
Pb and H

5.

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

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A.

collisions are perfectly elastic

B.

forces of repulsion exist

C.

forces of repulsion and attraction are in equilibrium

D.

collisions are inelastic.

Explanation. Give a better Explanation

Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.



6.
On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure
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A.
I, II, III and IV
B.
I and II only
C.
II only
D.
I, III and IV only.

7.
Which of the following statements is correct about the periodic table?
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A.
Elements in the same period have the same number of valence electrons
B.
The valence electrons of the elements in the same period increase progressively across the period.
C.
Elements in the same group have the same number of electron shells
D.
The non-metallic properties of the elements tend to decrease across each period.

8.
The boiling of fat and aqueous caustic soda is referred to as
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A.
hydrolysis
B.
esterification
C.
acidification
D.
saponification

9.
Which of the following pairs of substances will react further with oxygen to form a higher oxide?
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A.
CO2 and H2O
B.
NO and H2O
C.
CO and CO2
D.
SO2 and NO

10.
In the preparation of oxygen by heating KCIO3 in the presence of MnO2 , only moderate heat is needed because the catalyst acts by
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A.
lowering the pressure of the reaction
B.
increasing the surface area of the reaction
C.
increasing the rate of the reaction
D.
lowering the energy barrier of the reaction.

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