Tag: chemistry

Questions Related to chemistry

Which of the following is a part of the catalyst system used in Haber's process?

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. Copper oxide

  2. Iron 

  3. Potassium oxide

  4. Aluminium oxide

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Correct Option: B,C,D

Which of the following can produce ammonia from ammonium salts?

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. Quick lime

  2. Caustic soda

  3. slaked lime

  4. All

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Correct Option: B,C
Explanation:

Quick lime is $CaO$,caustic soda is$NaOH$, slaked lime is $Ca(OH) _2$.

$NH _4Cl+NaOH \rightarrow NH _3+H _2O+NaCl$
$NH _4Cl+Ca(OH) _2 \rightarrow NH _3+H _2O+CaCl _2$


Haber's process is a/an:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. endothermic process

  2. exothermic process

  3. spontaneous with no heat liberation

  4. None

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Correct Option: B
Explanation:

Haber's process is an exothermic process.

$N _2+3H _2 \rightarrow 2NH _3$

Urea on reacting with water gives:

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $NH _3$

  2. $N _2O _3$

  3. $HNO _2$

  4. $HNO _3$

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Correct Option: A
Explanation:

$NH _2CONH _2+H _2O \rightarrow 2NH _3+CO _2$

Urea on reaction with water gives carbondioxide and ammonia.

The complex formed in Brown Ring Test is ___________.

chemistry p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

  1. $[Fe(H _2O) _4(NO) _2]^{2+}$

  2. $[Fe(H _2O) _5(NO)]^{2+}$

  3. $[Fe(H _2O) _3(NO) _3]^{2+}$

  4. $[Fe(H _2O) _6(NO)]^{2+}$

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Correct Option: B
Explanation:

$[Fe(H _2O) _5(NO)]SO _4$ is the complex formed in brown ring test done to identify the presence of nirates.

Which of the following is organometalic compound 

chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

  1. Methyl lithium

  2. Lithium methoxide

  3. Lithium dimethyl amide

  4. Lithium acetate

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Correct Option: A
Explanation:

$LiCH _3$ have metal carbon bond so considered organometic compound and other do not have. 

Which of the following compounds on thermal decomposition yields a basic as well as an acidic oxide?

chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

  1. $KClO _3$

  2. $NaNO _3$

  3. $K _2CO _3$

  4. $MgCO _3$

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Correct Option: D
Explanation:

$MgCO _3\xrightarrow{\Delta} MgO+CO _2$

Since oxides of metals are basic in nature, $MgO$ is basic, and $CO _2$ is acidic. Hence decoposition of $MgCO _3$ yields both acidic and basic oxides

Which nitrate will decompose to give $NO _2$ on heating?

chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

  1. $NaNO _3$

  2. $KNO _3$

  3. $4RbNO _3$

  4. $LiNO _3$

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Correct Option: D
Explanation:

Only $LiNO _3$ gives $NO _2$ on heating. All other nitrates give oxygen.
$4LiNO _3 \, \xrightarrow{\Delta} \, 2Li _2O \, + \, 4NO _2 \, + \, O _2.$
$2NaNO _3 \, \xrightarrow{\Delta} \, 2NaNO _2  \, + \, O _2$

The close resemblance between the properties of an element of 2nd period with those of the element of 3rd period belonging to the next group is called:

chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

  1. periodicity

  2. periodic trend

  3. diagonal relationship

  4. group trend

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Correct Option: C
Explanation:

Option $(C)$ is correct.

The close resemblance between the properties of an element of 2nd period with those of the element of 3rd period belonging to the next group is called diagonal relationship.
These pairs (lithium and magnesium, beryllium and aluminium, boron and silicon etc.) exhibit similar properties.

What is the main reason of diagonal relationship between lithium and magnesium?

chemistry the s-block elements (alkali and alkaline earth metals) anomalous properties of lithium group 1 elements: alkali metals properties of s block elements

  1. Electronegativity remains constant the same on moving parallel.

  2. Electronegativity remains constant the same on moving horizontally.

  3. Electronegativity remains constant the same on moving diagonally.

  4. Electronegativity remains constant the same on moving vertically.

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Correct Option: C
Explanation:

The diagonally opposite elements possess almost similar electronegativities and there fore almost similar electropositive character.