Tag: chemistry

Questions Related to chemistry

The compound formed when an alkyl halide reacts with magnesium in ether is:

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

  1. Grignard reagent

  2. Antiseptic

  3. Anaesthetic

  4. Antipyretic

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Correct Option: A
Explanation:

Alkyl halide reacts with magnesium in ether solvent to form alkyl magnesium halide which is a Grignard reagent.
$RX+Mg \xrightarrow {ether} RMgX$

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.

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

  1. True

  2. False

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Correct Option: A
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.

Which is used to treat acid indigestion?

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

  1. $Be(OH) _2$

  2. $KOH$

  3. $Mg(OH) _2$

  4. $Ca(OH) _2$

Show answer
Correct Option: C
Explanation:

Milk of magnesia is an aqueous suspension of magnesium hydroxide $[Mg(OH) _2]$ used to treat acid indigestion.

Which of the following metals on treatment with alkali will liberate $H _2$ gas?

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

  1. Be

  2. Sn

  3. Ga

  4. In

Show answer
Correct Option: A,B,C
Explanation:

As Be, Sn and Ga are amphoteric metals so these metals on treatment with alkali will liberate $H _2$ gas.

The substance used as pigment in paint is :

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

  1. borax

  2. alumina

  3. lithophone

  4. none of these

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Correct Option: C
Explanation:

Lithophone (mixture of $ZnS, BaSO _4$) is used as pigment in paint.

Mg and Zn have following resemblance :

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

  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.

Show answer
Correct Option: B,D
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.

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

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

  1. True

  2. False

Show answer
Correct Option: A
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.

Kieserite is not an ore of:

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

  1. Cu

  2. Fe

  3. Mg

  4. Al

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Correct Option: A,B,D
Explanation:

Kieserite is the magnesium sulphate.


Kieserite is not the ore of Cu,Fe & Al.Its the ore of Mg.

Hence options A,B & D are correct.

Lithopone is mixture of :

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

  1. $ZnCO _3, BaCO _3$

  2. $ZnS, Na _2SO _4$

  3. $ZnSO _4, BaSO _4$

  4. $ZnS, BaSO _4$

Show answer
Correct Option: D
Explanation:

Lithopone, is Pigment White 5, is a mixture of inorganic compounds barium sulfate and zinc sulfide $(BaSO _4 , ZnS)$, is a widely used as a white pigment powder. 

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

  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. $(A)\rightarrow (iii), (B)\rightarrow (iv), (C)\rightarrow (ii), (D)\rightarrow (i)$

Show answer
Correct Option: D
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.