Question

What is the name of $ {{K}_{2}}Cr{{O}_{4}} $ .

Answer 1

Hint: A chemical formula is a means of presenting information on the chemical quantities of atoms that make up a chemical compound or molecule using chemical element symbols, numbers, and other symbols like parentheses, dashes, brackets, commas, and plus (+) and minus (-) signs. These are restricted to a single typographic line of symbols, including subscripts and superscripts.

Complete answer:
 $ {{K}_{2}}Cr{{O}_{4}} $ is the chemical formula for potassium chromate, which is an inorganic substance. Potassium chromate is a crystalline yellow solid that is water soluble. The principal hazard is an environmental threat, which necessitates prompt action to prevent its spread and imposing restrictions. It's used as a fungicide, to make pigments for inks and paintings, and to make other chromium compounds in chemical analysis.
Dipotassium monochromator potassium chromate are other names for it. It has the appearance of a golden crystalline solid. It has no odour and an unpleasant bitter taste. When potassium chromate is heated, it produces poisonous chromium vapours. When you come into touch with this inorganic substance, it can cause ulcers, bronchitis, shortness of breath, asthma, and pneumonia in your throat, lungs, and nose. Your kidneys, liver, immunological system, and gastrointestinal tract may all be affected. It is made up of chromate and potassium ions in a 1:2 ratio. It's a chemical that's commonly used in laboratories. It is a powerful oxidizer and extremely corrosive substance.
Two positively charged potassium cations ( $ {{K}^{+}} $ ions) and one chromate anion make up potassium chromate ( $ Cr{{O}_{4}}^{2-} $ ion). One chromium atom and four oxygen atoms make up the chromate anion. The centre chromium atom is doubly linked to two oxygen atoms and singly bonded to two oxygen atoms in this polyatomic ion. The charge of the singly bonded oxygen atoms is -1. (which enables them to obtain complete octet configurations).
Hence potassium chromate is the correct answer.

Note:
A metallochromic indicator is potassium chromate. Mohr's technique is based on the quantitative measurement of chloride, bromide, and cyanide ions by titrating with a standard solution of silver nitrate and a few ml of potassium chromate as an indicator. The yellow potassium chromate solution transforms to a brick red silver chromate precipitate near the equivalence point.