#1. Which one of the followings serum compounds is used for softening hard water?
#2. Which one of the followings naturally occurring acids is found in abundance in tomatoes?
#3. Which of the following statements about ‘fission’ is correct? 1) It is related to the creation of new individuals by means of cell division in a unicellular organism 2) It is related to the transformation of heavier nuclei into smaller nuclei 3) It is related to the creation of heavier nuclei by means of combining two higher nuclei Select the correct answer using the code given below:
#4. Aluminum is manufactured from
#5. Which one of the followings do silver articles react with, that makes the silver articles black?
#6. Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire?
#7. Which one of the followings is used in soda-acid fire extinguishers?
#8. A solution contains 20 g of solute in 180 g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage?
#9. Which one of the following metals has both malleability and ductility properties?
#10. An antibiotic is not useful against of virus whereas a vaccine is. Which one of the following is the most appropriate reason for this? .