Tag: chemistry

Questions Related to chemistry

The mixture of $CO$ and $N _2$ is called as :

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. Water gas

  2. Producer gas

  3. Synthetic gas

  4. Marsh gas

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Correct Option: B
Explanation:

Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. 
Producer gas: a gas composed of carbon monoxide, hydrogen, and nitrogen, obtained by passing air and steam through incandescent coke.
Syngas/synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and very often some carbon dioxide.
Marsh gas is methane $CH _4$.

Nitrogen molecule is chemically less active because of its :

chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

  1. small atomic energy.

  2. high dissociation energy.

  3. high electronegativity.

  4. stable electronic configuration.

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Correct Option: B
Explanation:
Nitrogen molecule is chemically less active because of its high dissociation energy. Nitrogen molecule contains triple bond between two atoms which is very strong and requires high energy for splitting the two nitrogen atoms of a molecule. 


In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. True

  2. False

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Correct Option: A
Explanation:

Mendeleev arranged the elements having similar configuration placed in the vertical columns as they will have the same unpaired electrons hence reflecting the similar properties. In Mendeleev's periodic table few elements that are chemically similar are placed in separate groups.

The horizontal rows in Mendleev's table were called :

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. groups

  2. rows

  3. periods

  4. none of the above

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Correct Option: C
Explanation:

The horizontal rows in Mendleev's table were called periods. There are seven periods in Mendeleev's periodic table.

The vertical columns in Mendeleev's table were called :

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. verticals

  2. periods

  3. columns

  4. groups

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Correct Option: D
Explanation:

The vertical columns in Mendeleev's table were called groups. There are $8$ groups in Mendeleev's periodic table.

If $Zn/Zn^{+2}$ electrode is diluted 100 times then the change in electromotive force will be :-

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. increases of 59 mV

  2. decreases of 59 mV

  3. increases of 29.5 mV

  4. decreases of 29.5 mV

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Correct Option: A

The process of depositing thin layer of a metal over an another metal with a help of electric current is called :

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. electrorefining

  2. electroplating

  3. thermoplating

  4. none of the above

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Correct Option: B
Explanation:

Electroplating is the process of plating one metal onto another, for decorative purposes or to prevent corrosion of a metal. 

Which pair of electrolytes could not be distinguished by the products of electrolysis using inert electrodes.

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. $\text{1M CuSO} _4$ solution, $\text{1M CuCl} _2$ solution

  2. $\text{1M KCl}$ solution, $\text{1M Kl}$ solution

  3. $\text{1M AgNO} _3$ solution, $\text{1M Cu(NO} _3) _2$ solution

  4. $\text{1M KCl}$ solution, $\text{1M NaCl}$ solution

  5. $\text{1M CuBr} _2$ solution, $\text{1M CuSO} _4$ solution

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Correct Option: A

Calculate the half cell potential at $298$K for the reactoin ,Zn$^{+2}$ + $2$e$^{-}$ $\rightarrow$ Zn if [Zn$^{+2}$] =$2$M,
E$^{o}$$ _{Zn^{+2}/Zn}$ =-$0.76$V

E$^{o}$



chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. -$0.90$ V

  2. -$0.75$ V

  3. A and B

  4. None of these

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Correct Option: B

The volume of gases evolved at STP by passing 0.1 ampere of current 49 65 seconds to 1 aqua solution of potassium?

chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

  1. 22.4

  2. 11.2

  3. 89.6

  4. 44.8

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Correct Option: B