1.
Which of the following statements are true for pure substances?
-
Pure substances contain only one kind of particles
-
Pure substances may be compound or mixtures
-
Pure substances have the same composition throughout
-
Pure substances can be exemplified by all elements other than nickel
2.
Which of the following apparatus is not required in sublimation?
3.
Solids are dispersed in liquids called
4.
Which type of mixture suspensions are
5.
Mixture of milk and water shows the following effect
7.
Mass of solute divided by volume of solution multiply by 100 then we get
8.
Foam is the example of
9.
We can separate the volatile components from non- volatile components by
10.
Tincture of iodine has antiseptic properties. This solution is made by dissolving
12.
Sol and gel are examples of
14.
Which of the following is a pure substance?
15.
Which of the following is a heterogeneous mixture?
16.
Which of the following is not a true solution?
17.
Two elements are liquid at 303K
18.
Which of the following is not a compound?
19.
Scattering of light occurs when a beam of light is passed through
20.
Brownian motion is due to
21.
Which of the following is not a colloid?
22.
Formation of water is made of oxygen and hydrogen
23.
Which of the following forms a colloidal solution in water?
24.
The element which is a liquid above 30 celcius is
25.
Cheese is an example of
26.
Which of the following is not a physical change?
27.
Which of the following is not a chemical change?
28.
State which of the following is not likely to be an element?
1. on heating gives off a gas and leaves a residue
11. burns in air to form carbon di oxide and water
111. changes into solid at 273K and to a gas at 373 k
29.
If the solution is 400 ml and solvent is 300ml so what is the percentage of solute?
30.
A mixture of sulphur and carbon di sulphide is
31.
Two chemical species X and Y combine together to form a product P which contains both X and Y.X+Y-P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
-
P is a compound
-
X and Y are compounds
-
X and Y are elements
-
P has a fixed composition
32.
Example of heterogenous solution
33.
Element is represented by
36.
The relation solubility and temperature is
37.
Can a beam of light pass through a true solution?
38.
The size of the solution particle is
39.
Milk of magnesia is the example of
40.
Definition of element was proposed by
41.
The size of the particle of a solution is
42.
Which of the following statement is correct about alloys?
43.
An element is made up of what type of atom
44.
Metal, non- metal, metalloid are categories of
45.
Copper is used making electric wires because
1. it is ductile
2. it is a good conductor of electricity
3. it is lustre
4. it is malleable
46.
Helium, argon, fluorine, hydrogen are examples of
47.
When sulphur is dissolved in carbon di sulphide then
49.
Suspension always scatter light
50.
Choose odd one out of the options
