Acidic Charac...

Acidic Character, Basic Character and Nature of Oxides

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The most basic among these hydroxides, is

$B e (O H)_{2}$
$M g (O H)_{2}$
$C a (O H)_{2}$
$B a (O H)_{2}$

Q. Arrange the following hydrides in their increasing acid strength

[C H_{4}, H_{2} S, P H_{3} a n d S i H_{4}]

$H_{2} S < P H_{3} < S i H_{4} < C H_{4}$
$C H_{4} < S i H_{4} < P H_{3} < H_{2} S$
$S i H_{4} < C H_{4} < P H_{3} < H_{2} S$
$C H_{4} < H_{2} S < P H_{3} < S i H_{4}$

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Q. An element

X

that has the configuration

n s^{2} n p^{1}

is present in a short period of the modern periodic table. The formula and nature of its oxide is:

$X O_{3}, amphoteric$
$X O_{3}, acidic$
$X_{2} O_{3}, amphoteric$
$X_{2} O_{3}, basic$

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Which of the following oxides is amphoteric in character

CaO
$C O_{2}$
$S i O_{2}$
$S n O_{2}$

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Q. Arrange the following oxides in the decreasing orders of their basic strength.

I . T l_{2} O

I I . A l_{2} O_{3}

I I I . T l_{2} O_{3}

I V . G a_{2} O_{3}

$I > I I I > I V > I I$
$I I > I V > I I I > I$
$I I I > I > I I > I V$
$I V > I I > I > I I I$

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Q. Match the following regarding nature of the oxides

\begin{matrix} Column -I & Column -II a . N_{2} O & (i) Basic b . B a O & (ii)Amphoteric c . A s_{2} O_{3} & (iii) Acidic d . C l_{2} O_{7} & (iv) Neutral \end{matrix}

a (ii), b (i), c (iii), d (iv)
a (iv), b (i), c (iii), d (ii)
a (iv) , b (i), c (ii), d (iii)
a (ii), b (i), c (iv), d (iii)

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Element P, Q, R and S belong to the same group. The oxide of P is acidic, oxide of Q and R are amphoteric while the oxide of S is basic. Which of the following elements is the most electropositive ?

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Define amphoteric oxides.

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Q. Arrange the following oxides in the decreasing orders of their basic strength.

I . T l_{2} O

I I . A l_{2} O_{3}

I I I . T l_{2} O_{3}

I V . G a_{2} O_{3}

$I > I I I > I V > I I$
$I I > I V > I I I > I$
$I I I > I > I I > I V$
$I V > I I > I > I I I$

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Q. Given that

E_{C l_{2} / C l^{-}}^{0} = 1.35 V

and

K_{s p} (A g C l) = 10^{- 10}

25^{o} C

E^{0}

corresponding to the electrode reaction is

\frac{1}{2} C l_{2} (g) + A g^{+} (a q) + e^{-} \to A g C l (s)

$0.75 V$
$2.65 V$
$1.05 V$
$1.94 V$

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Which one of the following oxides is neutral

CO
$S n O_{2}$
ZnO
$S i O_{2}$

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The pair of amphoteric hydroxides is

$A l (O H)_{3}, L i O H$
$B e (O H)_{2}, M g (O H)_{2}$
$B (O H)_{3}, B e (O H)_{2}$
$B e (O H)_{2}, Z n (O H)_{2}$

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The order in which the following oxides are arranged according to decreasing basic nature is

$N a_{2} O, M g O, A l_{2} O_{3}, C u O$
$M g O, A l_{2} O_{3}, C u O, N a_{2} O$
$A l_{2} O_{3}, M g O, C u O, N a_{2} O$
$C u O, N a_{2} O, M g O, A l_{2} O_{3}$

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Q. Arrange the following hydrides in their increasing acid strength

[C H_{4}, H_{2} S, P H_{3} a n d S i H_{4}]

$H_{2} S < P H_{3} < S i H_{4} < C H_{4}$
$C H_{4} < S i H_{4} < P H_{3} < H_{2} S$
$S i H_{4} < C H_{4} < P H_{3} < H_{2} S$
$C H_{4} < H_{2} S < P H_{3} < S i H_{4}$

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Identify the least stable ion among the following.

$L i^{-}$
$B e^{-}$
$B^{-}$
$C^{-}$

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Q. Arrange the following oxides in the decreasing order of their acidic strengths.

I . Z n O

I I . K_{2} O

I I I . P_{2} O_{5}

I V . M g O

$I > I I I > I I > I V$
$I I I > I > I V > I I$
$I I I > I V > I > I I$
$I V > I > I I I > I I$

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Acidity of pentoxides in VA group

Decreases
Increases
Remains same
None

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Q. Statement I Nitrogen and oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Statement II The reaction between nitrogen and oxygen requires high temperature.(J2015 Main)

Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
Statement I is true; Statement II is false.
Statement I is false; Statement II is true.

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Most reducing agent is

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Which of the following oxides is amphoteric in character

CaO
$C O_{2}$
$S i O_{2}$
$S n O_{2}$

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Strongest reducing agent is

$C l_{2}$
$C l^{-}$
$B r^{-}$
$I^{-}$

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Most reducing agent is

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Which of the following oxides is not expected to react with sodium hydroxide? [CBSE AIPMT 2009]

$B_{2} O_{3}$
$C a O$
$S i O_{2}$
$B a O$

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