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

Reaction of magnesium with air is:

  1. endothermic reaction

  2. reversible reaction

  3. exothermic reaction

  4. substitution reaction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option $(C)$ is correct.

The reaction of magnesium with air is an exothermic reaction as magnesium burns with dazzling brilliance in the air forming white shiny magnesium oxide with the evolution of a lot of heat.
$2Mg + O _2 \rightarrow 2MgO + heat$

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 oxide

  2. magnesium hydroxide

  3. potassium 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 oxide and magnesium hydroxide.
They act as an antacid to relieve indigestion, sour stomach, and heartburn.

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

Which of the following statement is correct?

  1. Magnesium oxide is highly soluble in water

  2. Magnesium oxide is slightly solution in water

  3. Magnesium oxide is insoluble in water

  4. All alkaline earth metal oxides are insoluble in water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option $(B)$ is correct.

Magnesium oxide is slightly soluble in water.It is due to an intramolecular force of the magnesium oxide compound. In fact, magnesium oxide is very small, and the attraction forces are very strong to be broke apart when reacted with water.

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

Calcining at different temperatures produces magnesium oxide of different reactivity.

  1. True

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

Calcining at different temperatures produces magnesium oxide of different reactivity.

High temperatures (1500 – 2000 °C) diminish the available surface area and produces dead-burned (often called dead burnt) magnesia, an unreactive form used as a refractory.
Calcining temperatures (1000 – 1500 °C) produces hard-burned magnesia, which has limited reactivity and calcining at lower temperature, (700 – 1000 °C) produces light-burned magnesia, a reactive form, also known as caustic calcined magnesia.
Although some decomposition of the carbonate to oxide occurs at temperatures below 700 °C, the resulting material appears to reabsorb carbon dioxide from the air.

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

Which of the following is not a method of production of magnesium oxide?

  1. $ Mg+O _2 \rightarrow MgO $
  2. $MgCO _3\xrightarrow{\Delta}MgO+CO _2$
  3. $Mg(OH) _2\xrightarrow{\Delta}MgO+H _2O$

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All of the above methods are used for the production of magnesium oxide.when magnesium is burnt in air magnesium oxide is produced. When magnesium carbonate is calcined magnesium oxide and carbon dioxide is produced. When magnesium hydroxide is calcined magnesium oxide and water is produced.

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

Magnesium oxide is not used in:

  1. refractive industry

  2. medicine

  3. construction

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Magnesium oxide is a mineral supplement used to treat or prevent low levels of magnesium in the blood. Magnesium is important for many systems in the body, but it is especially vital for healthy muscles and bones. Some people use it as an antacid to relieve heartburn, sour stomach, or acid indigestion. It also may be used as a laxative for short-term, rapid emptying of the bowel. It  is available without a prescription.