Chemistry Test Full marks – 80 Time 2 hrs
Section A
A. Multiple choice questions
1. Rust is a hydrated oxide of iron which is
a. Reddish brown
b. Green
c. Black
d. blue
2. a metalloid used in the manufacturing of microchips
a. silicon
b. arsenic
c. antimony
d. germanium
3. Balancing a chemical equation is based on
a. Law of conservation of mass
b. Symbols and formulae
c. Law of conservation of energy
d. None of the above.
4. Copper carbonate when heated, it turns :
a. Blue
b. Green
c. Black
d. Yellow
5. Noble gas used in advertising signboards is
a. He
b. Ne
c. Ar
d. Kr
B. Fill in the blanks (1x10)
1. --- is a liquid metal.
2. __ a solution of metal in mercury is called __
3. __ is used for making power transmission wires.
4. Bases react with some metals to form ………….. gas.
5. He substances formed as a result of a chemical reaction are called ___
6. During a chemical reaction transfer of __ takes place.
7. The substances which undergo chemical change are called ............... .
8. The basic strength of basic solution increases with ……………. in pH number.
9. In some chemical reactions, an insoluble ............... is formed when two solutions are
mixed.
10.Milk of magnesia, slaked lime, whitewash and soap solution are …………. in nature.
C. State if the following statements are True/False (1x10)
1. Brass is an alloy of copper and zinc and has lustrous yellow colour.
2. Nitric acid turns red litmus blue.
3. Graphite is used in making filamentsof electric hub.
4. Indicator is a substance which shows different colours in acidic and basic solutions.
5. A chemical equation gives only qualitative information of a chemical reaction.
6. Iodine acts as an antiseptic in the form of tincture of iodine.
7. Sand is an oxide of silicon.
8. No new substance is formed during a chemical reaction.
9. Balancing a chemical equation is based on law of conservation of energy.
10.Non-metals are poor conductors of electricity.
D. Give two examples each of chemical reaction with the following (2x5)
1. Evolution of gas
2. Liberation of heat
3. Formation of precipitate
4. Change in color
5. Change in state
E. Write word equation for the following skeletal equation :(1x5)
1. Zn + HCl → ZnCl2 + H2
2. FeCl2 + Cl2 → FeCl3
3. Na + O2 → Na2O
4. NaOH+ H2SO4 → Na2SO4 + H2O
5. AgBr → Ag +Br2
Section B
1. Answer the following
a. State differences between acids and bases. 3
b. Describe the process of neutralisation with the help of an example. 3
c. Give reasons : 4
i. Copper is used in electric cables.
ii. Aluminium is used in making aircraft.
2. Answer the following
a. State four conditions necessary for chemical reactions to take place. 3
b. Classify the following as acidic or basic substances : Lime juice, vinegar, vitamin
C tablet, milk of magnesia, slaked lime, soap solution. 3
c. Mention two uses of the following metals : 4
i. Iron
ii. Aluminium
iii. Gold
iv. iodine
3. Answer the following
a. Why does a yellow stain of curry on a white cloth turns reddish-brown when soap
is scrubbed on it ? 2
b. What are metalloids. Give examples. 2
c. Name the metals present in the following alloys: 3
(a) Brass
(b) Bronze
(c) Duralumin
d. Write pH value of the following : 3
pure water, blood , milk , lemon juice , soap solution, sodium in water.
4. Answer the following
a. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the
solution? Explain. 2
b. Give four differences between metals and non-metals with reference to their: 4
(a) Melting point and boiling point
(b) Conductivity of heat and electricity
(c) Malleability
(d) Solubility in water.
c. Write your observation for the following chemical reactions :- 4
i. Manganese dioxide is added to potassium chlorate and heated.
ii. Ammonium chloride is heated with sodium hydroxide.
iii. When sugar is heated.
iv. Potassium is added to water.
