Q2 of 43 Page 188

Write two allotropes of sulphur.

There are two allotropic forms of sulphur which are:

i. Rhombic sulphur- It is stable at temperature lower than 369K and has an octahedral structure.



ii. Monoclinic sulphur - It is stable at temperature higher than 369K and has a needle like structure.



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What is meant by liquor ammonia? Write its chemical formula.

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What is meant by allotropy and allotropes?

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Mention the effect of litmus paper on aqueous solution of ammonia.

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Mention the formulas of the products, name and physical state of the following reactions:

i. P4(s) + 502(g) ........................


ii. SO2(g) + H2O(l) ........................


iii. P4(s) + 6Cl2(g) ........................


iv. O2(g) + 2H2(g) ........................


v. Mg(s) + H2O(g) ........................


vi. 3Fe(s) + 4H2O(g) ......................


vii. CO (g) + H2O(g) .......................


viii. 3NO2 (g) +H2O(l) .......................


ix. S(s) +6HNO3(aq) .......................


x. SO3(g) + H2SO4(aq) .......................


xi C12H22O11(s)+ Con H2SO4(l) ..............


xii CaCO3(s) + dil H2SO4(aq) ..............