Chemistry Flashcard

Front

Which of the following statements is NOT a postulate of Werner’s theory of coordination compounds? A) A metal exhibits two types of valencies: primary and secondary, C) The secondary valency is directional in nature, D) The primary valency is ionizable

Back

The secondary valency corresponds to the oxidation state of the metal

Front

What is the Effective Atomic Number (EAN) of cobalt in [Co(CN)₆]³⁻?

Back

36

Front

Which reagent is commonly used in the EDTA method to determine water hardness? A) Methyl orange, B) Eriochrome Black T, C) Phenolphthalein, D) Potassium permanganate

Back

Eriochrome Black T

Front

Which metal ion is present in the center of the chlorophyll molecule?

Back

Magnesium

Front

What is the main principle of the zeolite process for softening hard water?

Back

Ion exchange process where Ca²⁺ and Mg²⁺ are replaced by Na⁺ ions