$O_{3}$ is used as a:

Germicide

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Disinfectant

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Sterilizing agent

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All of the above

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Solution

The correct option is D All of the above
Ability of the ozone to produce nascent oxygen makes it act as
Germicide: A substance or other agent which destroys harmful microorganisms
Disinfectant: substances used to control, prevent, or destroy harmful microorganisms (i.e., bacteria, viruses, or fungi) on inanimate objects and surfaces
Sterilizing agent: Sterilization is defined as the process where all the living microorganisms, including bacterial spores are killed

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O_{3}

is used as a:

Q. Assertion (A):

O_{3}

is used to study tailing effect.
Reason (R): Mercurous oxide is formed as a result of oxidation of mercury using ozone.
The correct answer is:

Q. An intimate mixture of ferric oxide and aluminium is used as solid fuel in rockets. Calculate the fuel value per

{c m}^{3}

of the mixture. Heats of formation and densities are as follows:

H_{f ({A l}_{2} O_{3})} = - 399 k c a l {m o l}^{- 1}; H_{f ({F e}_{2} O_{3})} = - 199 c a l {m o l}^{- 1}

Density of

{F e}_{2} O_{3} = 5.2 g / {c m}^{3}

; Density of

A l = 2.7 g / {c m}^{3}

${F e}_{2} O_{3}$ + $A l$ $\to$ $F e$ + ${A l}_{2} O_{3}$
This is the reaction used in thermite welding process. Calcium can also be used instead of aluminium in this process.

{N a}_{2} S_{2} O_{3} \cdot 5 H_{2} O

is used in photography to:

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O3 is used as a:

$O_{3}$ is used as a: