The irritation caused by red ants bite is due to____________________?

Related Mcqs:

1. Li is different from its family members due to____________________?

   A. small size
   B. high charge density
   C. less electropositivity
   D. all of the above

2. The molal boiling point constant is the ration of the elevation of boiling point to____________________?

   A. Molarity
   B. Molality
   C. More fraction of solvent
   D. Mole fraction of solute

3. Which of the following is the formula of chrome red ?

   A. Pb3 O4
   B. 2Pb CO3 – Pb (OH)2
   C. Pb Cr O4 – Pb (OH)2
   D. Pb2O

4. If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called_________?

   A. Annealing
   B. Quenching
   C. Tempering
   D. Nitriding

   Submitted by: Muhammad Ali Kunbhar

5. Which discovery caused a revision in the periodic law as stated by Mendeleev ?

   A. Location of nucleus by Rutherford
   B. Atomic number by Moseley
   C. X-rays by Roentgen
   D. Natural radioactivity by Henry Bacquerel.

6. Soil pollution is caused by:_________?

   A. Aerosol
   B. Ozone
   C. Acid rain
   D. PAN

   Submitted by: Fahad Mehsud

7. Black foot disease is caused by the pollution of groundwater as a consequence of increased seepage of:__________?

   A. Nitrates
   B. Fluorides
   C. Arsenic
   D. Mercury

   Submitted by: Abid Hussain

8. Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to_________________?

   A. More strength of H-bonding
   B. More strength of London forces
   C. Less polarizability
   D. All of the above

9. When water freezes at 0°C its density decreases due to_______________?

   A. Change of bond angles
   B. Cubic structure of ice
   C. Empty space present in the structure of ice
   D. Change of bond length

10. The coloured glassy mass in borax bead test is due to the formation of___________________?

    A. metal borate
    B. metal meta borate
    C. metal boride
    D. metal silicate