The formula C6H5-CO-CH3 represents

74. The formula C6H5-CO-CH3 represents

A.            Acetone

B.            Acetic acid

C.            Acetophenone

D.            Phenyl acetate

Answer: Option C

75.The metal that is usually extracted from sea water is

A.            Ca           B.            Na

C.            K             D.            Mg

Answer: Option D

76.The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

A.            liquation              B.            leaching

C.            levigation            D.            magnetic separation

Answer: Option C

77. The inert gases are ____ in water

A.            sparingly soluble

B.            insoluble

C.            soluble

D.            None of these

Answer: Option A

78.          The molecular formula of phosphorous is

A.            P1           B.            P2

C.            P3           D.            P4

Answer: Option D

79.The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

A.            atomic structure

B.            metallurgy

C.            periodic table of contents

D.            discovery of elements

Answer: Option C