Question 1 :
Brass gets discoloured in air because of the presence of which of the following gases in air?
Question 2 :
Which of the following is a non metal that remains liquid at room temperature?
Question 3 :
Chlorophyll is a naturally occurring chelate compound in which central metal is
Question 4 :
Which of the following is used in pencils?
Question 5 :
Which of the following metals forms an amalgam with other metals?
Question 6 :
Chemical formula for water is
Question 7 :
The gas usually filled in the electric bulb is
Question 8 :
Washing soda is the common name for
What is the scientific name for washing soda?
Sodium carbonate (also known as washing soda or soda ash), Na2CO3 is a sodium salt of carbonic acid.
Scientific name for baking soda?
Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. Since it has long been known and is widely used, the salt has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda.
Question 9 :
Quartz crystals normally used in quartz clocks etc. is chemically
Question 10 :
Which of the gas is not known as green house gas?
In order, the most abundant greenhouse gases in Earth's atmosphere are:
* water vapor
* carbon dioxide
* nitrous oxide
Question 11 :
Bromine is a
Question 12 :
The hardest substance available on earth is
Question 13 :
The variety of coal in which the deposit contains recognisable traces of the original plant material is
Question 14 :
Tetraethyl lead is used as
Question 15 :
Which of the following is used as a lubricant?
Question 16 :
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
Question 17 :
The gases used in different types of welding would include
Question 18 :
The property of a substance to absorb moisture from the air on exposure is called
Question 19 :
In which of the following activities silicon carbide is used?
Question 20 :
The average salinity of sea water is
Question 21 :
When an iron nail gets rusted, iron oxide is formed
Question 22 :
Galvanised iron sheets have a coating of
Question 23 :
Among the various allotropes of carbon,
Question 24 :
The group of metals Fe, Co, Ni may best called as
Question 25 :
Heavy water is