Q3 of 43 Page 188

Mention physical properties of non-metallic elements.

Physical properties of non-metallic elements are:

i. They are non-lustrous except iodine which is lustrous in appearance.


ii. They are brittle, hard or soft.


iii. They are poor conductors of electricity except graphite which is a good conductor of electricity.


iv. They combine with oxygen to form metallic oxides.


v. Metallic oxides are either acidic or neutral in nature.


More from this chapter

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2

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) ..............

 2

Mention the missing information in In the following chemical reactions:

(i) + H2O(l) H2SO4(aq)


(ii). S(s) + SO2(g)


(iii). + H2O(l) H2CO3(aq)


(iv). S(s) + H2(g)


(v). 2Na(s) + 2NaOH(aq) + H2(g)


(vi). Zn(s) + H2O(g) → ZnO(s) +


(vii). CH4(g) + H2O(g) CO(g) + 3H2(g)


(viii). CuO(s) + Cu(s) + H2O(g)


(ix). H2(g) + 2KH(s)


(x). MgSO4(aq) + Mg(OH)2(s) + (NH4)2SO4(aq)


(xi). SO2(g) + 2H2S(g) 3S(s) + 2H2O(g)


(xii). 2SO2(g) 2SO3(g)


(xiii). CuSO45H2O(s) + con. H2SO4(l)

3

Mention physical properties of dihydrogen gas.

 3

Write uses of dihydrogen gas.