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21 questions
Which statement is correct?
Cu reacts with steam to liberate hydrogen
Magnesium is more reactive than calcium
Potassium reacts with water to form hydrogen gas
Sodium oxide can be reduced by carbon to form sodium
Which substances do not react together?
Zinc and dilute HCl
Cu and dilute HCl
Na and water
Ca and water
Oxide of element X can be reduced by carbon. But element X does not react with steam or dilute HCl . What is X?
Cu
Mg
Zn
Fe
Potassium nitrate decomposes to form potassium nitrite and ....................................gas
Lithium nitrate decomposes to form which gas?
Oxygen
Nitrogen
Nitrogen di oxide
Water vapor
Zinc blend is heated in oxygen to form
Zinc sulphide
Carbon
Zinc oxide and carbon di oxide
Sulphur di oxide and zinc oxide
The compound used to remove silica from blast furnace in extraction of iron is
SiO2
CaSiO3
CaCO3 or Lime stone
oxygen
Aluminium is used to make aircraft bodies as it is
Soft
Lightweight and strong
Unreactive oxide layer
Has high density
Brass is an alloy of
70% Zn and 30% Cu
60% Zn and 40% Cu
70% Cu and 30% Zn
40% Sn and 60% Cu
Steel making occurs in BOC which is
Fe2O3 can be reduced to Fe by reacting it with:
Cu
Ag
Oxygen
Aluminum
Thermal decomposition of metal hydroxides produces
Metal oxide and water
Metal oxide and hydrogen
Metal and water
Metal and hydrogen
Silver nitrate on decomposition forms
Silver oxide and NO2
Silver and NO2
Silver, NO and O2
Silver, NO2 and O2
Stability of carbonates of group 2 elements ............down the group.
Remains same
Decreases
Increases
First increases then decreases
In reaction of copper sulphate with Zn ,...............ions are reduced
Zn^2+
Cu^2+
SO4^2-
Cu
A metal that reacts slowly with cold water but rapidly with steam
Na
Mg
K
Ca
Solder is an alloy of
Copper and lead
copper and zinc
Tin and lead
Tin and Zinc
Alloy of nickel and titanium is called nitinol. It has a special property called
Pure metals are malleable as atoms are arranged
in regular layers
in irregular layers
in molecules
in independent small domains
Metals react with water to form
Metal oxide and hydrogen
Metal hydroxide and vapour
Metal hydroxide and hydrogen
Metal hydroxide only
Carbon is used as a reducing agent to extract which metal from its oxide?
Na
Fe
Ca
Mg
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