Tag: chemistry

Questions Related to chemistry

In the reaction $N _{2}+3H _{2}\rightarrow 2NH _{3} $, the ratio by volume of $N _{2},\ H _{2} :$ and$: NH _{3}$ is $1 : 3 : 2$. 


This illustrates the law of:

chemistry states of matter: gaseous and liquid states gay lussac's law gas laws states of matter

  1. definite proportion

  2. multiple proportion

  3. reciprocal proportion

  4. gaseous volumes

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Correct Option: D
Explanation:

In the reaction, $N _{2}+3H _{2}\rightarrow 2NH _{3} $, the ratio by volume of $N _{2},\ H _{2} $ and $ NH _{3}$ is $1 : 3 : 2$. This illustrates the law of Gaseous volumes or Gay Lussac's law of combining volumes of gases.

According to this law, when gases react together to produce gaseous products, the volume of reactants and products bear a simple whole-number ratio with each other, provided volumes are measured at the same temperature and pressure.

So, the correct option is $D$.

To use Gay-Lussac's Law, which of the following needs to remain constant?

chemistry states of matter: gaseous and liquid states gay lussac's law gas laws states of matter

  1. Volume and the number of moles of a gas

  2. Pressure and temperature

  3. Temperature and the number of moles of a gas

  4. Pressure and the number of moles of a gas

  5. Temperature and volume

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Correct Option: A
Explanation:

$P \propto T $
At constant volume and number of moles of a gas, the pressure is directly proportional to the absolute temperature.

Hence, option $A$ is correct.

A closed vessel contains equal number of nitrogen and oxygen molecules at a pressure of $p\ mm$. If nitrogen is removed from the system then the pressure will be:

chemistry states of matter: gaseous and liquid states gay lussac's law gas laws states of matter

  1. $p$

  2. $2p$

  3. $p/2$

  4. $p^2$

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Correct Option: C
Explanation:
At constant $V, P\propto n$

$\therefore$ if no. of moles is halved then pressure will also reduce to $p/2$.

Option C is correct.

When soil pH is in the range 6 to 8, the soil fertility is diminished.

chemistry properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. True

  2. False

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Correct Option: B
Explanation:

It is not true that soil $pH$ is in the range $6$ to $8$, the soil fertility is diminished

Which of the following represents saline Hydrydes?

hydrides hydrogen and its compounds hydrogen chemistry

  1. $KH,\,Ca{H _2},\,Ba{H _2}$

  2. $NaH,Si{H _4},KH$

  3. $N{H _3},{B _2}{H _6}\,Al{H _3}$

  4. $N{H _3},{H _2}O,HF$

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Correct Option: B

$Ca{H _2}$ is an example of :

hydrides hydrogen and its compounds hydrogen chemistry

  1. Ionic hydride

  2. Covelent hydride

  3. Metallic hydride

  4. Polymeric hydride

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Correct Option: A

Which of the following pair behaves strong and weak base hydride :


$NH _3, PH _3, AsH _3, SbH _3, BiH _3$

hydrides hydrogen and its compounds hydrogen chemistry

  1. $NH _3, PH _3$

  2. $NH _3, BiH _3$

  3. $PH _3, BiH _3$

  4. $BiH _3, AsH _3$

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Correct Option: A

Ionic hydrides are usually:

hydrides hydrogen and its compounds hydrogen chemistry

  1. good electrical conductors when solid

  2. easily reduced

  3. good reducing agents

  4. liquid at room temperature

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Correct Option: C
Explanation:

Ionic hydrides are usually good reducing agents. 

$2CO+NaH \rightarrow HCOONa+C$ 
$PbSO _4+2CaH _2 \rightarrow PbS + 2Ca(OH) _2$ 
$Fe _3O _4 + NaH \rightarrow 3Fe +4 NaOH$

The stability of hydrogen halides is in the order of:

hydrides hydrogen and its compounds hydrogen chemistry

  1. $HF>HI>HBr>HCl$

  2. $HI>HBr>HCl>HF$

  3. $HF>HCl>HBr>HI$

  4. $HCl>HBr>HI>HF$

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Correct Option: C
Explanation:

Due to large difference in electronegativity of upper halogens and hydrogen, they are more stable than lower hydrogen halide.
$\therefore $ Stability order: $HF>HCl>HBr>HI$.

Which of the following hydride is 'electron-precise' type?

hydrides hydrogen and its compounds hydrogen chemistry

  1. $HF$

  2. $H _2O$

  3. $SiH _4$

  4. $PH _3$

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Correct Option: C
Explanation:

Hydrides of carbon family known as electron Precise.