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20 questions
Which is a metal?
Mg
S
P
Br
Which is an nonmetal?
Au
Hg
Br
Cu
Metalloids have properties of---------------
metals
nonmetals
both metals and nonmetals
neither metals nor nonmetals
Which is a metalloid?
Aluminium
Antimony
Zinc
Mercury
Which is a good conductor of electricity?
Bromine
Iodine
Graphite
Sulphur
Which metal is in liquid form at ordianry temprature and pressure?
Mg
Na
Sc
Hg
Bronze is an alloy of __________
Cu and Sn
Cu and Zn
Cu and Fe
Fe and Ni
An alloy prepared from Fe, Ni and Cr is known as __________
Brass
Bronze
Stainless steel
amalgam
Which Metal prevents the rusting of iron?
Cu
Zn
Al
Ag
Silver gets corroded due to which gas present in air?
Oxygen
Hydrogen sulphide
Carbon dioxide
Nitrogen
Jewellery articles are gold plated to _____
to prevent corrosion
to prevent rusting of the base metal
to make articles attractive
all of these
Ores contain metal compounds with some of the impurities like soil,sand,rocky material etc. These impurities are called as------------------
Minerals
Gangue
Metallurgy
corrosion
Mercury,silver,gold are very reactive metals
True
False
In electroplating a metal is coated with another metal using electrolysis.
True
False
Due to corrosion a greenish layer forms on the surface of copper or brass vessel.
True
False
Bronze:Copper and tin ::Brass:--------
Copper and Zinc
Copper and Aluminium
Copper and Iron
Copper and Nickel
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
Which two nonmetals are lustrous
Iodine and Diamond
Silver and Gold
Graphite and Potassium
Platinum and Mercury
Which nonmetal is in liquid state at room temperature
Br
Cu
K
Au
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