Tag: chemistry of non-metals
Questions Related to chemistry of non-metals
${PbO _2}$ is :
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acidic.
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basic.
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reducing agent.
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oxidizing agent.
$PbO _2$ is amphoteric so it can act as acid as well as base. Also it is strong oxidising agent.
Which of the following oxides is/are neutral?
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${N _2 O}$
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$CO$
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${Al _2 O _3}$
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$NO$
$Al _2O _3$ is amphoteric oxide, apart from this all other are neutral oxides.
Which of the following is/are peroxide(s) ?
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$ PbO _{2} $
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$ H _{2}O _{2} $
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$ SrO _{2} $
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$ BaO _{2} $
In $ {PbO} _{2}, $ Its $ Pb^{+4}$ & $ 2O^{-2} $
In $ {H _{2}O} _{2},$ there is peroxide linkage
In $ SrO _{2}, $ as Sr is alkaline earth metal
$ \therefore $ Its $ Sr^{2+} $
$ \therefore $ Its $ O _{2}^{-2}, (\bar{O}-\bar{O}) $ peroxide linkage
In $ BaO _{2},$ Its $ Ba^{{+2}}\therefore O _{2}^{-2} $
$ \bar{O}-\bar{O} $ peroxide linkage
Hence, the correct options are $\text{B}$, $\text{C}$ and $\text{D}$
Which of the following oxides is amphoteric in character?
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$CaO$
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$CO _2$
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$SiO _2$
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$SnO _2$
$SnO _2 + 2NaOH \rightarrow Na _2SnO _3 + H _2O$
$SnO _2 + 4HCl \rightarrow SnCl _4 + 2H _2O$+$CO _2$ is acidic in character.
$SiO _2$ is very weak acid.
A metal oxide is acidic when :
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$\sqrt{\varphi}\, <\, 2.1$
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$\sqrt{\varphi}\, =\, 2.1\, to\, 3.2$
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$\sqrt{\varphi}\, >\, 3.2$
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None of these
A metal oxide is acidic when $\sqrt{\varphi}\, >\, 3.2$
Which of the following oxides is/are not amphoteric in character?
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CaO
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$CO _2$
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$SiO _2$
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$SnO _2$
$CaO$, $CO _2$ and $SiO _2$ when dissolved in water gives base ,hence they are basic oxides.
Which of the following oxides are not neutral?
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$CO$
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$SnO _2$
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$ZnO$
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$SiO _2$
$CO$ is a neutral oxide insoluble in water, but behaves as amphoteric compound.
Select the correct statements:
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s-block metal oxides are basic in nature, except $BeO$ which is amphoteric.
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p-block metal oxides are acidic in nature, except $NO$,$ N _2O$,$ CO$.
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d-block metal oxides are basic, acidic, and amphoteric in nature.
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d-block metal oxides are only basic in nature.
(A) BeO is amphoteric in nature. It reacts with acids as well as alkalies. Oxides of other s block metal elements are basic in nature. They react only with acids. hence, the option A is correct.
The species that do not contain peroxide ions is :
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$PbO _2$
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$H _2O _2$
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$SrO _2$
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$BaO _2$
Only true peroxides which have -O-O- bond give hydrogen peroxide with dilute acids.
$PbO _2$ does not give hydrogen peroxide with dilute acids. So it is not a true peroxide.
Which one of the following statement is true?
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According to the modern atomic theory, atoms of the same element may have different atomic weights
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Reduction is the process of electron loss
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Acidic oxide are the non-metallic oxides
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The solubility of all substances decreases with increase in temperature
Acidic oxides are the oxides which reacts with water to form an acid. Acidic are non- metallic oxides. Some of the examples are ${ SO } _{ 3 }$ forms sulphuric acid and ${ CO } _{ 2 }$ forms carbonic acid.