Tag: biological importance of sodium and potassium

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

Simple proteins bonded with a non-protein prosthetic group (acting as a cofactor) are called:

  1. Simple proteins

  2. Conjugated proteins

  3. Proteonic proteins

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Simple proteins bonded with a non-proteinic prosthetic group (acting as cofactor) are called conjugated proteins.
Examples include  Glycoprotein, Lipoprotein, and Phosphoprotein.

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

Ripening of fruits can be caried out in presence of :

  1. $Na _2SO _4$
  2. $NaCl$
  3. $CaCl _2$
  4. $CaC _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium carbide (CaC2) reacts with moisture to produce acetylene gas, which acts as a synthetic plant hormone to induce fruit ripening.

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

Which is used for fixing atmospheric nitrogen?

  1. $CaCN _2$ (nitrolim)
  2. $Li _3N$
  3. $Mg _3N _2$

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For fixing atmospheric nitrogen -nitrolim is used and further $CaCN _2+C$ is used as fertilizer.

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

Which one of the following has magnesium?

  1. Vitamin $B _{12}$

  2. Chlorophyll

  3. Haemocyanin

  4. Carbonic anhydrase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$Mg$ is present in chlorophyll which is a green pigment and is used in photosynthesis in green plants.

Hence option B is correct.

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

Ripening of fruits can be carried out in the presence of :

  1. $Na _2SO _4 $
  2. $NaCl$
  3. $CaCl _2$
  4. $CaC _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium carbide is also used for ripening fruit artificially in some countries. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in reaction to the natural ripening agent ethylene.

Hence option  D is correct.

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

State True or False.
Magnesium is an essential constituent of chlorophyll, the green colouring matter of plants.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnesium is the central metal ion in the porphyrin ring of the chlorophyll molecule, which is essential for photosynthesis.

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

Nitrolim is a mixture of :

  1. $CaC _2$ and graphite
  2. $CaCN _2$ and graphite
  3. $Ca(CN) _2$ and graphite
  4. $CaCN _2+N _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 $CaC _2 +N _2\longrightarrow CaCN _2 +C$

When nitrogen is passed over calcium carbide at a suitable high temperature, we get a mixture of $CaCN _2 + Graphite (C)$ known as nitrolim which is a nitrogenous fertiliser." 

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

A holoenzyme contains apoenzyme and ____________ .

  1. isoenzyme

  2. cofactor

  3. inhibitor

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Holoenzyme = Apoenzyme+ Cofactor.

Apoenzyme:-An apoenzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic cofactor.
Cofactor:-A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity

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

For a given sample of water containing the following impurities
$Mg{ \left( H{ CO } _{ 3 } \right)  } _{ 2 }=73mg/L;\quad Ca{ \left( H{ CO } _{ 3 } \right)  } _{ 2 }=162mg/L;\quad Ca{ SO } _{ 4 }=136mg/L$
$Mg{ Cl } _{ 2 }=95mg/L;\quad Ca{ Cl } _{ 2 }=111mg/L;\quad NaCl=100mg/L$
Then the total hardness (temporary and permanent) of above water sample is

  1. $300ppm$
  2. $350ppm$
  3. $450ppm$
  4. $500ppm$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total hardness is calculated based on the concentration of Ca2+ and Mg2+ salts expressed as CaCO3 equivalents. Using molar masses (Mg(HCO3)2=146, Ca(HCO3)2=162, CaSO4=136, MgCl2=95, CaCl2=111), the calculation yields 300 ppm.

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

The metal ions (charged particles) that are required for contraction of muscles in human beings and animals are ions of:

  1. calcium

  2. sodium

  3. potassium

  4. iron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Ca^{2+}$ ions are required for contraction of muscles in humans.