Chemistry question

1.You can't live without iron. Where in the body is most of the iron located?

   A.your brain

   B.your skin

   C.your bone

   D.your blood

Answer:-Your blood

Explane:-Most of the body's iron is locked up in the hemoglobin found in red blood cells, used for oxygen transport.

2.The symbol Ag stands for which element?

   A.Gallium

   B.Silver

   C. Gold

   D.Magnesium

Answer:-Silver

Explane:-Ag stands for argentum, which is an old name for silver. The term "argent" survives, meaning silvery. 

3.. Organic chemistry is the study of the compounds that make up living organisms. All organic molecules contain:

    A.Carbon only

    B.Carbon and Nitrogen

    C.Carbon and Hydrogen

    D.Carbon ,Hydrogen and Oxygen

Answer:-Carbon and Hydrogen

Explane:-Not all compounds that contain carbon are organic. An example of an inorganic carbon compound is carbon dioxide. All organics contain both carbon and hydrogen. A quasi-exception would be carbon tetrachloride, which is an organic solvent. It's not actually organic, but it is nonpolar so it dissolves organic molecules.