Extraction of Magnesium

Q.

Two oxides of a metal contain 27.3% and 30% oxygen by mass respectively. If the formula of the first oxide is MO, then the formula of the second oxide is:-

1. MO

2. $M{O}_2$

3. $M_2{O}_3$

4. $M_{2}O$

Q. 13. Aqueous solution of COCl3/6NH3 upon addition with AgNO3 produces 3 moles white precipitate primary and secondary valency of metal in this complex is a)3, 6 b)2, 6 c)3, 3 d)6, 4

Q. in metal carbonyls of formula M(CO)x (which follows EN rules) if M is Ni, Fe, Cr the value of x will be 1.6, 5, 6 2.4, 5, 6 3.4, 4, 5 4, 4, 6, 6

Q. On strongly heating $MgC{l}_2.6H_{2}O$, the residue contains

1. 
2. 
3. 
4. 

Q. Which of the following statement is incorrect regarding Magnesium?

1. Mg is used in flash powders and bulbs, incendiary bombs and signals.
2. Mg-Al alloys being light in mass are used in air-craft construction.
3. None of the above
4. Magnesium cannot form alloys with aluminium or zinc but it forms alloys with manganese and tin.

Q. If Fe2+ and Fe3+ are present in Oxide of Iron Fe0.78O0.96 .Then Calculate Number of These Isotopes in Iron Oxide and Their % in The Iron Oxide.

Q. Which gas is liberated on electrolysis of molten saline hydrides ?

1. Hydrogen
2. Oxygen
3. Nitrogen
4. Chlorine

Q. Choose the correct statement(s) regarding Magnesium :

1. Magnesium forms alloys with aluminium, zinc, manganese and tin.
2. Mg-Al alloys being light in mass are used in air-craft construction.
   
3. Mg is used in flash powders and bulbs, incendiary bombs and signals.
4. Milk of magnesia is used as antacid in medicine.

Q. 57 Aqueous solution of CoCl3.6NH3 upon addition with AgNo3 produces 3 moles white precipitate. Primary and secondary valency of metal in this complex is

Q. Aluminium is diagonally related to :

1. $Si$
2. $Be$
3. $Li$
4. $B$

Q. Which of the following is not an ore of sulphate?

1. Anglesite
2. Baryte
3. Gypsum
4. None of the above

Q. Which of the following sodium compound is/are formed when an organic compound containing both nitrogen and sulphur is fused with sodium?

1. Sulphite and cyanide
2. Thiocyanate
3. Cyanide and sulphide
4. Nitrate and sulphide

Q. Which of the following is evolved/deposited at anode when electrolysis of molten $NaCl$ using inert platinum electrodes is carried out?

1. $Na\left(s\right)$
2. $H_2\left(g\right)$
3. $HCl\left(g\right)$
4. $C{l}_2\left(g\right)$

Q. In the electrolysis of fused calcium hydride, hydrogen is liberated at cathode.

1. True
2. False

Q.

Metallic magnesium is prepared by

1. Reduction of MgO by coke

2. Electrolysis of aqueous solution of Mg(NO₃)₂

3. Displacement of Mg by iron from MgSO₄ solution

4. Electrolysis of molten MgCl₂

Q. Which of the following process is used in the extractive metallugy of magnesium?

1. Fused salt electrolysis
2. Self reduction
3. Aqueous solution electrolysis
4. Thermite process

Q. What are covalent bongs exactly

Q.

1. Fe
2. Al
3. Hg
4. Ca

Q. "Na and Mg are also called bridge element since it links Group IA and Group IB".

Q. The carbon-based reduction method is NOT used for the extraction of

1. Tin from $Sn{O}_2$
2. Iron from $F{e}_2{O}_3$
3. Aluminium from $A{l}_1{O}_3$
4. Magnisiumfrom $MgC{O}_3.CaC{O}_3$

Q. What does pulverized ore mean?

Q. To prevent magnesium from oxidation in electrolytic extraction process

1. Some calcium fluoride is added

2. The whole process is done in an atmosphere of coal gas

3. Some chlorides are added

4. Metal is taken out by spoons

Q.

Metallic magnesium is prepared by

1. Reduction of MgO by coke

2. Reduction of MgO by coke

3. Displacement of Mg by iron from $MgS{O}_4$ solution

4. Electrolysis of molten $MgC{l}_2$

Q.

The metal that is extracted from sea water is

1. Ca

2. Mg

3. Sr

4. Ba

Q.

Which of the following ore contains both magnesium and calcium

1. Magnesite

2. Dolomite

3. Phosphorite

4. Carnellite

Q.

$Mg+H_{2}S{O}_4\to \underset{–}{A}+H_2\left(Mg\right)\left(dilute\right)$

$Mg+2H_{2}S{O}_4\to \underset{–}{A}+\underset{–}{B}+2H_{2}O.\left(Concentrated\right)$ A & B are

1. MgSO₄, SO₃

2. MgO, SO₃

3. MgO, SO₂

4. MgSO₄, SO₂

Q. Fill in the blanks.
In the _____________ sulphur is present in certain ores like sulphides.