Introduction to Alkaline Earth Metals

Q. Match List -I with List - II.
$\begin{array}{cccc}& \text{List-I}& & \text{List-II}\\ & \text{(Hydrides)}& & \text{(Nature)}\\ \text{(a)}& Mg{H}_2& \text{(i)}& \text{Electron precise}\\ \text{(b)}& Ge{H}_4& \text{(ii)}& \text{Electron deficient}\\ \text{(c)}& B_2{H}_6& \text{(iii)}& \text{Electron rich}\\ \text{(d)}& HF& \text{(iv)}& \text{Ionic}\end{array}$
Choose the correct answer from the options given below.

1. (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)
2. (a) – (iv), (b) – (i), (c) – (ii), (d) – (iii)
3. (a) – (iii), (b) – (i), (c) – (ii), (d) – (iv)
4. (a) – (i), (b) – (ii), (c) – (iv), (d) – (iii)

Q. The elements of group - 2 are called alkaline earth metals because

1. they are alkaline in nature
2. they occur in earth's crust and form alkaline salts
3. their oxides are alkaline and occur in earth's crust
4. these are $s-$ block elements

Q. The ion having highest mobility in aqueous solution is

1. $B{e}^{2+}$
2. $M{g}^{2+}$
3. $C{a}^{2+}$
4. $B{a}^{2+}$

Q.

An alkaline earth metal ‘$\mathrm{M}$’ readily forms water-soluble sulphate and water-insoluble hydroxide. Its oxide $\mathrm{MO}$ is very stable to heat and does not have a rock-salt structure. $\mathrm{M}$ is

1. $\mathrm{Ca}$

2. $\mathrm{Be}$

3. $\mathrm{Mg}$

4. $\mathrm{Sr}$

Q.

Why do beryllium and magnesium not impart colour to the flame in the flame test?

Q.

Describe Group $\mathrm{III}$ elements?

Q.

Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

Q. 4. The octahedral complex of a metal ion M3+ with four monodentate ligands L1, L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is: (1) L3 < L2 < L4 < L1 (2) L1 < L2 < L4 < L3 (3) L4 < L3 < L2 < L1 4) L1 < L3 < L2 < L4

Q.

Name the chemical formula of sodium amalgam.

Q. In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

Q. Which one of the following has the highest ionization energy?

1. $Li$
2. $Na$
3. $K$
4. $Rb$

Q. Alkaline earth metal(s) which does (do) not impart colour to the flame is (are):

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

Q. Match List-I with List -II :

List-I	List-II
(a)$Li$	(i) Photoelectric cell
(b)$Na$	(ii) Absorbent of $C{O}_2$
(c)$K$	(iii) Coolant in fast breeder nuclear reactor
(d)$Cs$	(iv) Treatment of cancer
	(v) Bearings for motor engines

Choose the correct answer from the options given below :

1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. (a)-(v), (b)-(iii), (c)-(ii), (d)-(i)
3. (a)-(v), (b)-(i), (c)-(ii), (d)-(iv)
4. (a)-(v), (b)-(ii), (c)-(iv), (d)-(i)

Q.

Explain charcoal cavity test.

Q.

Give examples and suggest reasons for the following features of the transition metal chemistry:

(i)The lowest oxide of transition metal is basic, and the highest is amphoteric/acidic.

(ii) A transition metal exhibits the highest oxidation state in oxides and fluorides.

(iii) The highest oxidation state is exhibited in the oxoanions of a metal.

Q. Which of the following properties of beryllium is different from other elements in the group ?

1. Atomic size
2. Ionisation enthalpy
3. Form covalent compound
4. All of these

Q.

Why do Non-metals have high Ionization energy values?

Q. Which of the following compounds can make hydrates?

1. $MgC{l}_2$
2. $CaC{l}_2$
3. $NaCl$
4. $KCl$

Q.

Why do Beryllium and Magnesium does not show color to the flame as other alkaline earth metals do?

Q.

Out of $N{a}_{2}O$ and $MgO$ which is more basic?

Q. In comparison to boron, berylium has

1. lesser nuclear charge and lesser first ionisation enthalpy
2. greater nuclear charge and lesser first ionisation enthalpy
3. greater nuclear charge and greater first ionisation enthalpy
4. lesser nuclear charge and greater first ionisation enthalpy

Q. In the periodic table calcium lies above barium. Which one is more reactive?

1. Ca
2. Ba
3. Both are equally reactive
4. Nothing could be predicted

Q.

What is true regarding the salt Ammonium nitrate(${\mathrm{NH}}_4{\mathrm{NO}}_3$)?

i. It contains both ionic and covalent bonds.

ii. It is soluble in water to form an alkaline solution.

iii. It completely decomposes into gaseous compounds on heating.

1. (i) and (ii)

2. (ii) and (iii)

3. (i) and (iii)

4. (i), (ii) and (iii)

Q. Number of atoms of iron present in 100 g of Fe2O3 having 20% purity is

Q. Which one of the following alkaline earth metal plays important role in in neuromuscular function, interneuronal transmission, cell membrane integrity, and blood coagulation?

1. Be
2. Ca
3. All of the above.
4. Ba

Q. Choose the incorrect statement regarding Beryllium :

1. Cu-Be alloys are used in the preparation of high strength springs.
2. Metallic beryllium is used for making windows of X-ray tubes.
3. It is used in the manufacture of alloys.
4. $BeC{O}_3$ is an ingredient of toothpaste.

Q. Which of the following metals has the highest melting point ?

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

Q. What colour does Ca ion impart to an oxidizing flame?

1. Brick red
2. Crimson
3. Apple green
4. Orange

Q. Which of the following is true for magnesium ?

1. It is more electropositive than sodium
2. Magnesium react vigorously with water
3. It is a strong reducing agent
4. It resembles, in chemical properties, with its diagonally placed element Boron in 13 group of the Periodic Table.

Q. As the oxidation number​ of a transition metal in transition metal oxide increases​, the ionic character

1. Increases
2. Decreases
3. Remains constant
4. Cannot be predicted