Tag: chemistry

Questions Related to chemistry

A typical $70$ kg man constitutes $X$ kg of sodium and $Y$ kg of potassium?

chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

  1. $x=90,\ y=70$

  2. $x=90,\ y=170$

  3. $x=70,\ y=90$

  4. $x=170,\ y=90$

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Correct Option: B
Explanation:

Option $(B)$ is correct.

A typical 70 $kg$ man constitutes 90 $kg$ of sodium and  170 $kg$ of potassium.

Sodium ions are found in:

chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

  1. outside of cells

  2. blood plasma

  3. interstitial fluids

  4. within cell fluids

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Correct Option: A,B,C,D

Which element is present in blood plasma in larger quantity?

chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

  1. Sodium

  2. Potassium

  3. Iron

  4. Copper

Show answer
Correct Option: A
Explanation:
Option $ (A) $ is correct.
Sodium is present in blood plasma in larger quantity. It is present in extracellular fluid and interstitial fluids.
Hence, even though sodium diffuses into the cell due to the concentration gradient, there is a sodium pump which pushes it back again.

Which of the following element participate in oxidation of glucose to form ATP?

chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

  1. Calcium

  2. Sodium

  3. Magnesium

  4. Potassium

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Correct Option: D
Explanation:
Option $(D)$ is correct.
Potassium participates in the oxidation of glucose to form ATP through  ATP-sensitive potassium channel. 

Select the correct statement with respect to sodium peroxide?

chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

  1. It decolourises the $KMnO _4$ solution.

  2. On heating with oxygen at $450^0C$ and 300 atm pressure, it becomes paramagnetic.

  3. It is obtained along with sodium metal when sodium oxide is heated to a temperature more than $400^oC$.

  4. It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.

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Correct Option: A,B,C
Explanation:

(A) $2Mn{ O } _4^-(pink)+16H^++5O _2^{2-}\rightarrow 2Mn^{2+}+8H _2O+5O _2$.
(B) $Na _2O _2+O _2\xrightarrow [300 atm]{> 450^oC} 2NaO _2 ({ O } _2^-$ contains on unpaired electron in $\pi^*$ MO).
(C) $2Na _2O\xrightarrow {400^oC} Na _2O _2+2Na$.
(D) Gives only $H _2O _2$.

Which salt can be used to identify coloured cation?

limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

  1. Borax

  2. Microcosmic salt

  3. Both (a) and (b)

  4. None of these

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Correct Option: C
Explanation:

Borax and Microcosmic are generally used to identify coloured cations.

$Ca^{2+}$ can stop:


limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

  1. Bleeding

  2. infection

  3. bone growth

  4. all

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Correct Option: A
Explanation:

Bleeding can be stopped by using $Ca^{2+}$ salt. Bleeding is due to the deficincy of calcium in blood, Sufficient calcium should b provided by the diet.

Following compounds are used in fire-works :

limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

  1. $LiNO _{3}$

  2. $BaCl _{2}$

  3. $(NH _{4}) _{2}Cr _{2}O _{7}$

  4. all of these

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Correct Option: D
Explanation:

All compounds are used in fire works.
$LiNO _{3}$ on ignition imparts crimson red,
                        $BaCl _{2} \rightarrow $ green
           $(NH _{4}) _{2}Cr _{2}O _{7}\rightarrow$ green.

The hydration energy of ${Mg}^{+2}$ is larger than that of ?

limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

  1. ${Al}^{+3}$

  2. ${Na}^{+1}$

  3. ${Be}^{+2}$

  4. ${Mg}^{+3}$

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Correct Option: B
Explanation:

Hydration energy depends on charge of ion and ionic radius. Higher the charge, greater the hydration energy. On the other hand, smaller the size, greater the hydration energy. Charge is considered first for comparison. Hence, $Mg^{2+}$ has higher hydration energy than $Na^+$.

Metal used in flash photography is:

limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

  1. Mg

  2. Al

  3. Both Mg & Al

  4. Neither Mg nor Al

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Correct Option: C
Explanation:

Magnesium($Mg$) and aluminum($Al$) metals are used in flash photography.