Metallurgy

In order to reduce zinc metal from its oxide __________ is used.

Type you answer:

Name the powders added to lower the melting point of alumina. (Name only. Don't write the formulae)

In Bayer's Process impurities like __________ are removed when the ore is reacted with concentrated caustic soda.

Mercury,silver,gold are very reactive metals

• True

• False

What property defines a metals ability to withstand twisting, bending, stretching, or deformation without breaking.

• Hardness

• Brittleness

• Ductility

• Toughness

According to the reactivity of metals----------------------------

• Zn <Al <Fe <Cu

• Al< Fe< Cu <Zn

• Al< Fe< Zn <Cu

• Cu< Fe< Zn <Al

Two highly reactive metals are

• Na and K

• Cu and Fe

• Ag and Au

• Al and Zn

Ores contain metal compounds with some of the impurities like soil,sand,rocky material etc. These impurities are called as------------------

• Minerals

• Gangue

• Metallurgy

• corrosion

Sulphide ores are concentrated using ______ method.

• Wilfley Table

• Hydraulic Separation

• Magnetic Separation

• Froth Floatation

• Leaching

What is the colour of the flame when sodium metal is heated?

• RED

• YELLOW

• GREEN

• WHITE