Uses of Alkaline Earth Metals

Q. Chocolate brown precipitate (A) is formed when aq. $CuS{O}_4$ reacts with $K_4\left[Fe\right(CN{)}_6]$. What is the formula of A from the following?

1. $CuCN$
2. $CuO$
3. $C{u}_{2}O$
4. $C{u}_2\left[Fe\right(CN{)}_6]$

Q.

The suitable method to deionize water is:

1. Synthetic resin

2. Permutit method

3. Calgon

4. Clarks Method

Q. A firework gives crimson red colour. It possibly contains some salt of

1. Ca
2. Ba
3. Sr
4. Mg

Q. 48. 0.2 M solutions of potassium ferrocyanide k4(FE(CN)6) is 75% dissociated at a particular temperature. The value of Vant Hoff factor for k4(FE(CN)6 is

Q. Which of the following is used as a scavenger in metallurgy?

1. Be
2. Mg
3. Ca
4. Sr

Q. Nitrolim which is used as a fertilizer has the composition

1. 
2. 
3. 
4. 
   

Q. ntXeF6 +SbF3---------------------------------->A cation + B anionn ntIncorrect statement for above changes isn nt1. XeF6 act as F- donorn nt2. Hybridisation state of central atom in cationic part is sp3d2n nt3. Anionic part is isostructural with PCl6 -n nt4. Both cation and anion have identical shapen ntAlso explain the reaction.n

Q. Which of the following statement(s) is/are true regarding the Ruby gemstone?

1. It contains 2% of $M{n}^{2+}$
2. It contains 0.5-1% of $C{r}^{3+}$
3. It shows colour due to d-d transitions
4. (b) and (c) above.

Q.

An aqueous solution of salt of sodium (NaX) on boiling with $MgC{I}_2$ gives white precipitate, hence anion X is:

1. 

2. 

3. 

4. 

Q. During military operation, hydrogen is generally obtained by the action of water on

1. 
2. 
3. 
4. 

Q. Which of the following is laboratory preparation method of $C{O}_2$?

1. $CaC{O}_3\left(s\right)+HCl\left(aq\right)\to$
2. $CaC{O}_3\left(s\right)\to$
3. $C{H}_4\left(g\right)+2O_2\left(g\right)\stackrel{\Delta }{⟶}$
4. Both (a) and (c)

Q.

The product obtained as a result of a reaction of nitrogen with $Ca{C}_2$ is

1. $CaC{N}_3$

2. $C{a}_{2}CN$

3. $Ca\left(NCN\right)$

4. $CaCN$

Q. Which of the following statements is false?

1. $M{g}^{2+}$ ions form a complex with ATP
2. $C{a}^{2+}$ ions are important in blood clotting
3. $C{a}^{2+}$ ions are not important in maintaining the regular beating of the heart
4. $M{g}^{2+}$ ions are important in the green parts of the plants

Q. Metal used in flash photography is:

1. Al
2. Both Mg & Al
3. Mg
4. Neither Mg nor Al

Q. Moles of KClO3 required for producing sufficient O2 to react with 1 mole of Al will be

Q. Which of the following statement(s) for crystals having Frenkel defect is/are correct?

1. Frenkel defects are observed where the difference in sizes of cations and anions is larger.
2. Usually alkali halides do not have Frenkel defect.
3. $AgBr$ crystal have both Frenkel defect and Schottky defect.
4. The density of crystals having Frenkel defect is lesser than that of a pure perfect crystal.

Q.

$MgS{O}_4$ on reaction with $N{H}_{4}OH$ and $N{a}_{2}HP{O}_4$ forms a white crystalline precipitate. What is its formula?

1. $Mg\left(N{H}_4\right)P{O}_4$

2. $M{g}_{3}P{O}_4$

3. $MgC{l}_2.MgS{O}_4$

4. $MgS{O}_4$

Q. Silver nitrate gives a white precipitate (A) with aqueous sodium thiosulphate (B); the precipitate dissolves in excess of thiosulphate. If the precipitate is heated with water., it turns black (C), and the upper layer liquid then gives a white precipitate (D) with acidified barium nitrate solution.

1. $A{g}_2{S}_2{O}_3$
2. $A{g}_{2}S$
3. $Ag{S}_2{O}_3$
4. $AgN{O}_3$

Q. Bones glow in the dark because :

1. they contain shining material.
2. they contain red phosphorus.
3. white phosphorus undergoes slow combustion in contact with air.
4. white phosphorus changes into red form.

Q. Which of the following statement(s) is/are true regarding the Ruby gemstone?

1. It contains 2% of $M{n}^{2+}$
2. It contains 0.5-1% of $C{r}^{3+}$
3. It shows colour due to d-d transitions
4. It shows colour due to f-f transition

Q. Fe(CN6)-6
( -6 in power)

Will this compound present in coordination compounds??

Q.

Select the alkaline earth metal, whose hydroxides form an important component of antacids?

1. Be

2. Ba

3. Mg

4. Ca

Q. Consider the reaction

The major product obtained at the end of the above reaction sequence is

1. 
2. 
3. 
4. 

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

1. Grignard reagent
2. Antiseptic
3. Anaesthetic
4. Antipyretic

Q. The hydration energy of ${Mg}^{+2}$ is larger than that of ?

1. ${Na}^{+1}$
2. ${Al}^{+3}$
3. ${Be}^{+2}$
4. ${Mg}^{+3}$

Q. (A), a colourless solution, gives white precipitate (B) with NaOH solution but the precipitate dissolves in excess of NaOH forming (C). (C) does not give any precipitate with $H_{2}S$ but on boiling with $N{H}_{4}Cl$, white precipitate (B) appears. (A) also gives yellow precipitate with $AgN{O}_3$. (A), (B) and (C) are as follows:

Q. The metal used as a reducing agent in the extraction of boron and silicon is :

1. Ca
2. Mg
3. Ba
4. Be

Q. The metal used for making X-ray window is:

1. $Mg$
2. $Na$
3. $Ca$
4. $Be$

Q. Which of the following compounds is used as drying agent?

1. Calcium Oxide
2. Gypsum
3. Calcium Chloride
4. None of the above

Q. 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