Choose the most appropriate answer from ( SO2 , SiO2 , Al2O3 , CO , MgO , Na2O )(a) A covalent oxide of a metalloid. (b) An oxide which when dissolved us water form acid . (c) A basic oxide (d) An amphoteric oxide

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Solution

a) Silicon is a metalloid. The covalent oxide is SiO₂
b) Acidic oxide - gives acid with water - SO₂
SO₂ + H₂O ----> H₂SO3
c) Basic oxide - gives base with water - Na₂O
Na₂O + H₂O -----> 2 NaOH
d) An amphoteric oxide - Shows both acidic and basic property
Al₂O₃

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Choose the most appropriate answer from the following list of oxides which fit the descriptions. Each answer may be used only once:

[S O_{2}, S i O_{2}, A l_{2} O_{3}, M g O, C O, N a_{2} O]

(i) A basic oxide
(ii) An oxide which dissolves in water forming an acid.
(iii) An amphoteric oxide
(iv) A covalent oxide of a metalload.

(a) What are amphoteric oxides? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following:
$N a_{2} O : C O_{2}; C O; S O_{2}; M g O; N_{2} O; H_{2} O .$
(c) Which of the following are amphoteric oxides:
$M g O, Z n O, P_{2} O_{3}, A l_{2} O_{3}, N O_{2}$

Classify ${Na}_{2} O$ , ${Al}_{2} O_{3}$ and ${SO}_{3}$ as acidic, basic or amphoteric oxide. [3 MARKS]

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

Q. Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide

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Choose the most appropriate answer from ( SO2 , SiO2 , Al2O3 , CO , MgO , Na2O )(a) A covalent oxide of a metalloid. (b) An oxide which when dissolved us water form acid . (c) A basic oxide (d) An amphoteric oxide

a) Silicon is a metalloid. The covalent oxide is SiO​2 b) Acidic oxide - gives acid with water - SO2 SO2 + H2O ----> H2SO3 c) Basic oxide - gives base with water - Na2O Na2O + H2O -----> 2 NaOH d) An amphoteric oxide - Shows both acidic and basic property Al2O3

a) Silicon is a metalloid. The covalent oxide is SiO₂
b) Acidic oxide - gives acid with water - SO₂
SO₂ + H₂O ----> H₂SO3
c) Basic oxide - gives base with water - Na₂O
Na₂O + H₂O -----> 2 NaOH
d) An amphoteric oxide - Shows both acidic and basic property
Al₂O₃