Tag: some important compounds of magnesium and calcium

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Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Give chemical name and nature (acidic or basic) of the ash formed by burning of a $Mg$ ribbon in the air? 

  1. magnesium chloride, acidic

  2. magnesium nitrite, basic

  3. magnesium oxide, acidic

  4. magnesium oxide, basic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Magnesium oxide is formed as ash by burning of $Mg$ ribbon in the air. This is an exothermic reaction.
$2Mg + O _2 \rightarrow 2MgO + \:energy$
Magnesium oxide is basic in nature as it reacts with water to form magnesium hydroxide which is a base.
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Oxide used to treat indigestion and relieve pain is:

  1. magnesium hydroxide

  2. magnesium oxide

  3. calcium oxide
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Oxide used to treat indigestion and relieve pain are magnesium hydroxide and magnesium oxide. Heartburn and acid indigestion are caused by excess acid in the stomach. Magnesium oxide and hydroxide treats these stomach problems by neutralizing the acid in the stomach. 
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

The powder of zinc phosphate cement contain zinc oxide and:

  1. magnesium sulphate

  2. magnesium phosphate

  3. magnesium oxalate

  4. magnesium oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
The powder of zinc phosphate cement contains zinc oxide and magnesium oxide. It is used for dentistry, cementation of inlays, crowns, bridges etc.
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

The compounds of alkaline earth metals ($Mg$) have following magnetic nature:

  1. diamagnetic

  2. anti ferromagnetic

  3. ferromagnetic

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

The compounds of alkaline earth metal are diamagnetic because they don't have any unpaired electrons. Their electronic configuration is $np^6ns^2$.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which of the following(s) is/are correct for magnesium and zinc?

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

  3. Both are used as electrodes

  4. Both are used to prevent corrosion
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation
Option $(B)\ ,(C),\ (D)$ are correct. They all are facts.
$MgO$ is basic while $ZnO$ is amphoteric in nature.
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which ionisation energy of alkaline earth metal is less than that of alkali metals?

  1. Third

  2. Second

  3. First

  4. Fourth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The second ionisation energy of alkaline earth metal is less than that of alkali earth metals.
The 2nd electron in case of alkali metal is to be removed from a cation (unipostive ion) which has already acquired a noble gas configuration whereas, in case of alkaline earth metals, the second electron is to be removed from a cation which is yet to acquire the stable noble gas configuration. Therefore, removal of 2nd electron in case of alkaline earth metals requires much less energy than that in the case of alkali metals.

Hence, the correct option is $B$
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Sorel cement is the mixture of:

  1. $CaCO _3+H _2O$
  2. $MgCl _2+MgO$
  3. $BaSO _4+CO _2$
  4. $MgO+Na _2HPO _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sorel cement is a mixture of magnesium chloride and magnesium oxide.

$5MgO+MgCl _2+13H _2O \rightarrow MgCl _2.5Mg(OH) _2.H _2O$
$3MgO+MgCl _2+11H _2O \rightarrow MgCl _2.3Mg(OH) _2.H _2O$