Class 9th Chemistry Chapter 7


Total Marks: 31

1. Which one of the following is not an electrolyte?
Sugar solution Sulphuric acid solution Lime solution Sodium chloride solution
2. The loss of electron by an atom or ion is:
Oxidation Reduction Neutralization None of these
3. Which one of these is a non conductor?
Rubber Aluminium Silver Copper
4. The total oxidation number of a water molecule is:
Zero -2 +2 +1
5. Electrochemistry is a branch of chemistry which deals with the relation between electricity and:
Atoms Physical properties Chemical reactions Compounds
6. Redox reactions are:
Oxidation reduction reactions Neutralization reactions Spontaneous reactions Non spontaneous reactions
7. The oxidation number of Mn in KMnO is:
+8 +7 +6 +4
8. The oxidation number group 1 elements is :
+1 -1 -2 +2
9. Corrosion can change which one of the following?
Silver Zinc Copper Iron
10. Galvanizing is done by coating iron with a thin layer of
Sn Cr Al Zn
11. A specie that reduces a substance by donating electrons to it is called ?
Oxidizing agent Reducing agent Coloring agent Dehydrating agent
12. Which one of the following is not an electrolyte ?
Sugar solution Sulphuric acid solution Lime solution Sodium chloride solution
13. Identify non-electrolyte from the following
Urea and sugar Na and HCl Water Lime water and NaOH
14. Pure silver is also known as
Fine silver Black silver Metal silver Rot silver
15. The oxidation state of an element goes from +7 to +2. How many electrons does it gain?
2 5 7 9
16. During the formation of water from hydrogen and oxygen, which of the following does not occur:
Hydrogen has oxidized Oxygen gains electrons Oxygen has reduced Hydrogen behaves as oxidizing agent
17. The most common example of corrosion is:
Chemical decay Rusting of iron Rusting of aluminium Rusting of tin
18. Which one of the following is not an electrolyte?
Sugar solution Sulphuric acid solution Lime solution Sodium chloride solution
19. Which one of the following is not electrolytic cell?
Downs cell Galvanic cell Nelson cell Both a and c
20. Formation of water from hydrogen and oxygen is:
Neutralization Decomposition Acid-base reaction Redox
21. Spontaneous chemical reaction take place in
Downs cell Nelson\'s cell Galvanic cel Electrolytic cell
22. In ____ branch of chemistry, the relationship between electricity and chemical reaction is studied.
Organic chemistry Inorganic chemistry Electrochemistry Industrial chemistry
23. Electrochemistry is branch of chemistry which deals with relationship between.
Carbon and its compounds Solute and solutions Electricity and chemical reaction Metal and non metals
24. Anode of Down\'s cell is made of
Steel Copper Zinc Graphite
25. The concentrated solution of common salt in water is called.
Brine Benzene Alcohol Toluene
26. What is obtained from fused NaCl?
NaOH Sodium metal Both A & B None of these
27. Which one of following method is used for production of sodium metal?
Nelsons cell Down\'s Cell Galvanic Cell Electro plating
28. In Down\'s cell where sodium is collected at.
At anode At cathode In solution On wires
29. In electrolysis of aqueous solution of NaCl to prepare caustic soda which reaction occur at anode?
Formation of water molecules Oxidation of Cl- ions Reduction of H+ ions Reduction of Na+ ions
30. The oxidation number of C in C11 H22 O11 is
-22 +20 +18 +22
31. The oxidation number of P in H PO is:
5- +5 +3 -4