Question

fill in the blanks with the correct word in brackets: i) If an element 6 electrons in its outermost L shell it's valency is___________(+2,-2,+1,-1). ii) Thermal______________(decomposition,dissociation) is a reversible reaction. iii)The formula of aluminum sulphide is (AIS, Al3S2,Al2S3) iv)Direct combination of reaction of sulphur dioxide with water gives____________(H2SO4,H2SO3,H2S2O7). v) A trivalent metal is______________(Aluminum,Sodium,Magnesium).

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Answer 1

Answer:

a)2+;b)Devon.,..c) sulphuric acid..V) sodium

Answer 2

Answer:

1. Oxygen (Valency -2)

2. Decomposition

3. Al2S3

4. H2SO3

5. Aluminum