Q. Among the given elements, which comes first in the periodic table of element ?
Q. Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B)?
2) A-CO2; B-Ca(OH)2
3) A-O2; B-Ca(OH)2
4) A-CO2; B-CaCO3
Q. Which one of the following is used in soda-acid fire extinguishers?
1) Sodium chloride
2) Sodium hydrogen carbonate
3) Calcium hydroxide
4) Acetic acid
Q. Which one of the following sodium compounds is used for softening hard water?
Q. Which of the following statements about fission is correct?
1. It is related with the creation of new individuals by means of cell division in unicellular organism.
2. It is related with the transformation of heavier nuclei into smaller nuclei.
3. It is related with the creation of a heavier nuclei by means of combining two higher nuclei.
Select the correct answer using the code given below -
1) 1 only
2) 2 only
3) 1 and 2 only
4) 1 and 3 only
Q. 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?
Q. Which one of the following metals has both malleability and ductility properties?
Q. Which one of the following elements is a non-metal but is lustrous?
Q. Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire?
Q. Which one of the following substances do silver articles react with, that makes the silver articles black?
3) Carbon dioxide
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