Class 9 Chemistry MCQ Chapter 9

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Films are coated by special chemical known as ____________ detectors.
Photographic
Image
Nil
Both

In peroxides, the oxidation no. of O is
+1
-1
+3
-3

Gases produced in Nelson’s cell are:
H2 and O2
H2 and CI2
H2 and N2
CI2 and O2

CO2 the oxidation number of C =.
+1
+2
+3
+4

By electrolytic refining of copper , it is ____________ % pure.
98
99
99.99
100

Nelson’s cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?
CI2
H2
O3
O2

Formation of water form hydrogen and oxygen is:
Redox reaction
Acid-base reaction
Neutralization
Decomposition

Which one is strong electrolyte ?
NH4OH
NaOH
a & b
Nil

Which one of the following is a galvanic cell?
Daniel cell
(‘radio-button-click-target’, “Nelson’s cell”)(‘radio-button-click-target’, “Down’s cell”)
Both B and C

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:
H2S
Br2
S
2HBr

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