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Introduction to Nitric Acid

Which of the ...

Question

Which of the following acid is used by goldsmiths for cleaning gold and silver ornaments?

A

H C l

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B

H_{2} {S O}_{4}

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C

{H N O}_{3}

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D

H_{3} {P O}_{4}

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Solution

The correct option is C ${H N O}_{3}$
Some precious metals such as gold and platinum do not react with nitric acid hence it is used for cleaning purpose of these metals.

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Q. The total number of diprotic acids among the following is:

H_{3} {P O}_{4}, H_{2} {S O}_{4}, H_{3} {P O}_{3}, H_{2} {C O}_{3}, H_{2} S_{2} O_{7}, H_{3} B O_{3}, H_{3} {P O}_{2}, H_{2} {C r O}_{4}, H_{2} {S O}_{3}

H_{2} {S O}_{4}

H_{3} {P O}_{4}

are neutralized separately by the same amount of an alkali when sulphate and dihydrogen phosphates are formed respectively.Find the ratio of the masses of

H_{2} {S O}_{4}

H_{3} {P O}_{4}

H_{2} {S O}_{4}

H_{3} {P O}_{4}

are neutralized separately by the same amount of an alkali when sulphate and dihydrogen orthophosphate are formed, respectively. Find the ratio of the masses of

H_{2} {S O}_{4}

H_{3} {P O}_{4}

Q. Which symbol is used for silver-gold ornaments?

Q. Which zone of a flame does goldsmiths use for melting gold and silver?

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