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ELEMENTS AND METALS MCQs

Total Questions : 63 | Page 6 of 7 pages
Question 51.


Tetraethyl lead is used as



  1.    pain killer
  2.    fire extinguisher
  3.    mosquito repellent
  4.    petrol additive
 Discuss Question
Answer: Option D. -> petrol additive


Question 52.

The hardest substance available on earth is



  1.    Gold
  2.    Iron
  3.    Diamond
  4.    Platinum
 Discuss Question
Answer: Option C. -> Diamond


Question 53.


The variety of coal in which the deposit contains recognisable traces of the original plant material is



  1.    bitumen
  2.    anthracite
  3.    lignite
  4.    peat
 Discuss Question
Answer: Option D. -> peat


Question 54.


Which of the gas is not known as green house gas?



  1.    Methane
  2.    Nitrous oxide
  3.    Carbon dioxide
  4.    Hydrogen
 Discuss Question
Answer: Option D. -> Hydrogen

In order, the most abundant greenhouse gases in Earth's atmosphere are:
* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* chlorofluorocarbons


Question 55.


Bromine is a



  1.    black solid
  2.    red liquid
  3.    colourless gas
  4.    highly inflammable gas
 Discuss Question
Answer: Option B. -> red liquid


Question 56.


Quartz crystals normally used in quartz clocks etc. is chemically



  1.    silicon dioxide
  2.    germanium oxide
  3.    a mixture of germanium oxide and silicon dioxide
  4.    sodium silicate
 Discuss Question
Answer: Option A. -> silicon dioxide


Question 57.

Which of the following is used in pencils?



  1.    Graphite
  2.    Silicon
  3.    Charcoal
  4.    Phosphorous
 Discuss Question
Answer: Option A. -> Graphite


Question 58.

Washing soda is the common name for



  1.    Sodium carbonate
  2.    Calcium bicarbonate
  3.    Sodium bicarbonate
  4.    Calcium carbonate
 Discuss Question
Answer: Option A. -> Sodium carbonate

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 59.

Which of the following metals forms an amalgam with other metals?



  1.    Tin
  2.    Mercury
  3.    Lead
  4.    Zinc
 Discuss Question
Answer: Option B. -> Mercury


Question 60.


The gas usually filled in the electric bulb is



  1.    nitrogen
  2.    hydrogen
  3.    carbon dioxide
  4.    oxygen
 Discuss Question
Answer: Option A. -> nitrogen


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