Tag: chemistry

Questions Related to chemistry

A basic oxide will be formed by the element:

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $K$

  2. $S$

  3. $P$

  4. $Kr$

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Correct Option: A
Explanation:

Basic oxides will be formed by metals. Potassium is a metal and it forms basic oxides.

Which of the following oxides react with both $HCl$ and $NaOH$?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $CaO$

  2. ${N} _{2}{O} _{5}$

  3. ${CO} _{2}$

  4. $ZnO$

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Correct Option: D

The metals which can produce amphoteric oxides are:

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. sodium and aluminium

  2. zinc and potassium

  3. calcium and sodium

  4. aluminium and zinc

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Correct Option: D
Explanation:

'$Al$' and '$Zn$' reacts with both acids and bases. So, these are amphoteric in nature. So, oxides of these elements are amphoteric oxides. 

Out of the following oxides, the amphoteric oxide is:

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $Fe _2O _3$

  2. $Al _2O _3$

  3. $P _2O _5$

  4. $N _2O$

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Correct Option: B
Explanation:

Aluminium reacts with acids and bases. So, it is amphoteric in nature. The oxide of an amphoteric element is called amphoteric oxide. So, $Al _{2}O _{3} $ is an amphoteric oxide.

One of the following is not a neutral oxide. This is:

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $CO$

  2. $H _2O$

  3. $N _2O$

  4. $Na _2O$

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Correct Option: D
Explanation:

Sodium is a metal and metal oxides are basic in nature. So, $Na _{2} O$ is a basic oxide. It is not neutral oxide.

Which oxide is neutral state?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $CO _2$

  2. $SO _2$

  3. $P _2O _5$

  4. $N _2O$

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Correct Option: D
Explanation:

${ N } _{ 2 }O,CO,{ H } _{ 2 }O$ these are some samples of neutral oxides.

Pick the group which does not contain a neutral oxide.

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $NO _2, P _4O _{10}, Al _2O _3, NO$

  2. $MgO, N _2O _5, SO _3, N _2O$

  3. $CO _2, SO _3, CaO, XeO _3$

  4. $CO, SiO _2, SnO _2, Na _2O _3$

Show answer
Correct Option: A
Explanation:

Neutral oxide are those which do not react with acids as well as bases such as $NO,{ N } _{ 2 }O,CO,{ O } _{ 2 }{ F } _{ 2 }$.

So only option $C$ does not contain neutral oxide.

In view of the signs of $\Delta _{r}G^{0}$ for the following reactions :
$PbO _{2} +Pb \rightarrow 2PbO, \Delta _ {r}..G..^{0},0$
$SnO _{2} +Sn \rightarrow 2SnO, \Delta _ {r}..G..^{0},0$

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. For lead +2, for tin +2

  2. For lead +4, for tin +4

  3. For lead +2, for tin +4

  4. For lead +4, for tin +2

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Correct Option: A

Among the following which one has more acidic character?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $B _{2}O _{3}$

  2. $CO _{2}$

  3. $N _{2}O _{3}$

  4. None of these

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Correct Option: A
Explanation:

$B _2O _3$ is more acidic than $CO _2$ and $N _2O _5$ because oxides of elements of 13th group of modern periodic table is more acidic than than 14th and 15th group elements.

The purest form of water that is considered to be ________.

chemistry environment environmental impact: global warming green house effect geobiochemical cycle

  1. tap water

  2. water from wells

  3. bore water

  4. rain water

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Correct Option: D
Explanation:
Rain water is considered the purest form of water. 

Impurities and salts present in water on earth are left behind during vapourization by the sun. 

These minerals and micro-organisms are present in ground water resources such as tap, well, bore.

herefore, option D is correct.