Tag: chemistry

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

State True or False.
Caphosol a supersaturated calcium phosphate solution is used in the prevention and treatment of oral mucositis caused by chemotherapy or radiotherapy.

  1. True

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

A supersaturated calcium phosphate solution such as Caphosol may be used in the prevention and treatment of oral mucosits caused by chemotherapy or radiotherapy.

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

Mg and Zn have following resemblance :

  1. MgO and ZnO are amphoteric.
  2. $MgCO _3$ and $ZnCO _3$ both on heating give corresponding oxide.

  3. both are d-block elements.

  4. both are used to prevent corrosion.
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

A) MgO is basic oxide and ZnO is acidic oxide.

B) $MgCO _3$ and $ZnCO _3$ both on heating give corresponding oxide(MgO and ZnO) carbon dioxide.

C) Mg is s block and Zn is d block element,both are not d block

D) both are used to prevent corrosion(Corrosion is the gradual destruction of 
materials (usually metals) by chemical reaction with their environment. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen).

Hence options  B & D are correct.

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

State True or False.
Tricalcium phosphate is used as a nutritional supplement and occurs naturally in cow milk.

  1. True

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

Tricalcium phosphate is used as a nutritional supplement and occurs naturally in cow milk.
Thus, the given statement is true.
However commonly used supplements include calcium carbonate and calcium citrate.
Calcium carbonate should be taken with food and calcium citrate should be taken without food.

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

Match the column I with column II and mark the appropriate choice.

Column I Column II
(A) $Na^+$ (i) Chlorophyll
(B) $K^+$ (ii) Bones and teeth
(C)  $Ca^{2+}$ (iii)  Regulating flow of water across cell membrane
(D) $Mg^{2+}$ (iv) Activation of enzyme in this cell fluids
  1. $(A)\rightarrow (i), (B)\rightarrow (iii), (C)\rightarrow (ii), (D)\rightarrow (iv)$
  2. $(A)\rightarrow (iv), (B)\rightarrow (iii), (C)\rightarrow (ii), (D)\rightarrow (i)$
  3. $(A)\rightarrow (i), (B)\rightarrow (ii), (C)\rightarrow (iii), (D)\rightarrow (iv)$
  4. $(A)\rightarrow (iii), (B)\rightarrow (iv), (C)\rightarrow (ii), (D)\rightarrow (i)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Uses of alkaline earth metals:

$Na^+$ regulates the flow of water across the cell membrane by the process of diffusion.
$K^+$ helps in activation of enzyme in this cell fluids.
$Ca^{2+}$is present in our bones and teeth.
$Mg^{2+}$ is bound as the central atom of the porphyrin ring of the green plant pigment, chlorophyll.