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Which of these metals cannot displace hydrogen from a dilute acid? (a) iron (b) zinc (c) silver (d) calcium
SILVER
Gold normally occurs in nature (a) in a free state. (b) as carbonate ore. (c) as sulphate ore. (d) as sulphide ore.
FREE STATE
Which one of the following alloys is light and strong? (a) brass (b) stainless steel (c) duralium (d) bronze
C
Metal A dipped in a salt of metal B displaces B from the solution. This shows that (a) A is more reactive than B. (b) B is more reactive than A. (c) both A and B are equally reactive. (d) no such conclusion can be drawn
A
Metals react with mineral acids to form A) Salt + Water B) Salt + Hydrogen C) Salt + HCl D) All
B
The process of coating iron sheets with a thin layer of zinc is called A) Hibernation B) Electroplating C) Galvanisation D) None
C
Which Of The Following Non-Metals Reacts And Catches Fire On Exposure To Air? [A]. Phosphorus [B]. Nitrogen [C]. Sulphur [D]. Hydrogen
A
When non-metals react with water then (a) Hydrogen gas is formed (b) Carbon dioxide gas is formed (c) Non-metals do not react with water
C
In displacement reactions (a) a more reactive metal displaces a less reactive metal. (b) a less reactive metal displaces a more reactive metal. (c) both (a) and (b) (d) none of these
A
Silver is the best conductor of electricity. Can you say why electric wires are not made of silver?
IT IS VERY EXPENSIVE
Suppose copper was high up in the reactivity series. Would it still have been such a useful metal? Give reasons.
No, it very react easily so we cannot use it properly
It has been noticed that silverware becomes black faster today than it did fifty years ago. What can be the reason for this?
sulphur content in air have increased
Arrange the following metals in the sequence of more reactive to less reactive.Iron, Zinc, Magnesium, Copper
Magnesium>Zinc>Iron>Copper.
The metal which is liquid at room temperature is (a) sodium (b) bromine (c) calcium (d) mercury
mercury
Materials having qualities of both metals and non-metals are (a) alloys (b) metalloids (c) noble metals (d) none of these
metalloids
Non-metals are: (a) generally liquids(b) generally gases (c) generally solids and gases(d) generally gases and liquids.
c
