Choose the false statements and rewrite them. (a)Alkali metals possess both +1 & +2 oxidation states. (b) Lithium is found to be the strongest reducing agents among the alkali metals.(c) Manufacturing of rayon is known as viscose process. (d) Washing soda is used to remove temporary hardness of water.

State whether the following sentences are true or false: (a) Metals in the second group are called alkali metals. (b) Alkali metals are not found in free state in nature. (c) Baking soda is chemically sodium hydrogen carbonate. (d) Portland cement is basically silicates and alu minates of calcium.

Consider the following statements and arrange in the order of true or false I) Group 2 elements are known as alkaline earth metal except Be II) Be has the highest standard reduction potential among group 2 members III) Mg burns with dazzling brilliance in air to give MgO and Mg (NO_(3))_(2) IV) Calcium and barium metals are used to remove air from vacuum tubes (1) TTTT (2) FFFF (3) TTFT (4) TFFT

Find the true statement/statements a) In a given period Delta_(i)H_(1) is the lowest for an alkali metal and highest for noble gas. b) Cs has the lowest and He has the highest Delta_(i)H_(1) among all elements. c) Lowest Delta_(i)H_(2) among the elements of third period is for Mg. d) The metal with the highest Delta_(i)H_(1) is mercury. e) Ni (II) compounds are thermodynamically more stable than Pt(II) compounds while Ni(IV) compound are less stable than Pt(IV) compounds.