Ashu, a 15 year old boy while travelling in car saw that a factory near the outskirt of city caught fire. He came to know from his father that the factory is of petrochemicals. Quickly, he told his father to stop the car. He got down and called the fire brigade. Fortunately, fire brigade arrived within 15 minutes and controlled the fire. (i) What is the substance used as fire extinguisher by firemen and why? (ii) What is the basic principal of controlling the fire? (iii) Which value of Ashu is depicted here?

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

b. is the answer hoped i        

answer; 4 electrons;