\(\Delta { G }^{ o }\) vs T plot in the Ellingham's diagram slopes downward the reaction ________.

(a)

\(Mg+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow MgO\)

(b)

\(C+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow CO\)

(c)

\(2Ag+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

(d)

\(2Ag+\frac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

Pick out the alloy that contains a non-metal as a constituent in it ________.

(a)

Brass

(b)

Bronze

(c)

Steel

(d)

Invar

Ignition mixture used in aluminothermic process is ________.

(a)

Cr + AI₂O₃

(b)

Mg + BaO₂

(c)

AI + Cr₂O₃

(d)

Ba + MgO

Malachite has______ composition.

(a)

2CuCO₃.Cu(OH)₂

(b)

CuCO₃.Cu(OH)₂

(c)

Cu₂O

(d)

Cu₂S

Zinc blende is_______.

(a)

ZnS

(b)

PbS

(c)

Ag₂S

(d)

Cu₂S

In acid leaching process the insoluble sulphide is converted into soluble sulphate and elemental_______.

(a)

carbon

(b)

lead

(c)

sulphur

(d)

zinc

Sulphide ore is converted to oxide form by using the process________.

(a)

Calcination

(b)

Roasting

(c)

Smelting

(d)

Leaving

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

(a)

magnetic properties

(b)

chemical properties

(c)

physical properties

(d)

melting point

Zinc is extracted from Zinc blende by________.

(a)

Carbon reduction process

(b)

Nitrogen reduction process

(c)

Oxygen reduction process

(d)

All of these

\(ZnS+{ 3O }_{ 2 }\overset { \Delta }{ \longrightarrow } 2ZnO+{ 2SO }_{ 2 }\uparrow \) . The above equation is an example for________.

(a)

calcination

(b)

reduction

(c)

roasting

(d)

leaching

Gibb's free energy is given by_______

(a)

\(\Delta { G }^{ 0 }=-nF{ E }^{ 0 }\)

(b)

\(\Delta { G }^{ o }=nF\)

(c)

\(\Delta { G }^{ o }=nF{ E }^{ o }\)

(d)

\(\Delta { E }^{ o }=-nF{ G }^{ 0 }\)

Na[Ag(CN)₂] is _________.

(a)

Sodium aurocyanide

(b)

Sodium meta aluminate

(c)

Aluminosilicate

(d)

Sodium dicyanoargentate

\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______

(a)

1

(b)

0

(c)

+2

(d)

-2

Semiconductors are purified by_______ method.

(a)

Zone refining

(b)

Electrolytic refining

(c)

Mond's process

(d)

Bessemerisation

Magnesite is_______.

(a)

Magnesium oxide

(b)

Magnesium carbonate

(c)

Magnesium sulphate

(d)

Magnesium chloride

The following set of reaction is used for refining titanium. This method is known as___________
\({ Ti }_{ (g) }+{ 2I }_{ 2(s) }\longrightarrow { TiI }_{ 4 }\left( vapour \right) \)
\({ Til }_{ 4 }(vapour)\longrightarrow Ti_{ (g) }+{ 2I }_{ 2(s) }\)

(a)

Hall Heroult process

(b)

Mond process

(c)

Van-Arkel process

(d)

Alumino thermic process

In the metallurgy of iron, limestone is added to coke. Which acts as a_______

(a)

Reducing agent

(b)

Oxidising agent

(c)

Slag

(d)

Flux

A mixture containing sulphides of copper and iron is called______

(a)

mineral

(b)

ore

(c)

matte

(d)

matrix

Cinnabar is the sulphide ore of _________ metal.

(a)

Zn

(b)

Pb

(c)

Hg

(d)

Ag

The percentage of carbon in high carbon steel is_________.

(a)

0.5 - 1%

(b)

0.15 - 1.5%

(c)

0.15 - 1.5%

(d)

0.15 - 0.3%

Froth flotation process is suitable for concentrating ______ores.

(a)

oxide

(b)

carbonate

(c)

sulphide

(d)

halide

Steel is an alloy of___________

(a)

iron and carbon

(b)

iron and calcium

(c)

copper and carbon

(d)

copper and iron

Metal oxide is converted into metal by the _______ process.

(a)

Calcination

(b)

roasting

(c)

smelting

(d)

bessemerisation

Sodium cyanide solution is used to extract _________from its ores

(a)

copper

(b)

silver

(c)

gold

(d)

both (b) and (c)

In the thermite process __________is used as a reducing agent

(a)

AI

(b)

CO

(c)

C

(d)

CO₂