Reducing Nature of Alkali Metals

Which of the following represents the Wurtz- Fittig reaction?

Which compound will show the highest lattice energy?

1. RbF

2. CsF

3. KF

4. NaF

The yellow colour of ZnO and conducting nature produced in heating is due to -

1. Extra positive ions present in aninterstitial site

2. Metal excess defects due to interstitial cation

3. Trapped electrons

4. All

How do you account for the strong reducing power of lithium in aqueous solution?

The ionic radius of Cr is minimum in which of the following compounds?Why?

A)CrO2

B)CrCl2

C)K2CrO4

D)CrF3

Why Lithium-ion is highly hydrated?

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

1. $CC{l}_4$
2. $SiC{l}_4$
3. $GeC{l}_4$
4. $GeB{r}_4$

Why Lithium has high melting and boiling point?

1. At ${800}^{o}C,Cu$ can be used for the extraction of $Zn$ from $ZnO$
2. At ${1400}^{o}C,Al$ can be used for the extraction of $Zn$ from $ZnO$
3. At ${500}^{o}C$, coke can be used for the extraction of $Zn$ from $ZnO$
4. Coke cannot be used for the extraction of $Cu$ from $C{u}_{2}O$

1. Poorest reducing agent
2. Strongest oxidising agent
3. Poorest oxidising agent
4. Strongest reducing agent

The reducing power of a metal depends on various factor. Suggest the factor which makes Li, the strongest reducing agent in aquous solution.
(a) Sublimation enthalpy (b) Lonisation enthalpy
(c) Hydration enthalpy (d) Electron - gain enthalpy

Lithium is the strongest reducing agent though it has the highest ionization energy in its group. Which of the following factors is responsible for making $\mathrm{Li}$ the strongest reducing agent?

1. Large heat of atomisation

2. Smaller size

3. Large sublimation energy

4. Large amount of hydration enthalpy

1. sodium ion
2. ammoniated electron
3. ammoniated sodium ion
4. sodium amide

Why is lithium the strongest reducing agent?

On dissolving moderate amount of sodium metal in liquid $N{H}_3$ at low temperature, which one of the following does not occur?

1. Liquid ammonia becomes good conductor of electricity

2. Liquid NH₃ remains diamagnetic

3. Na⁺ ions are formed in solution

4. Blue coloured solution is obtained

Why is white or yellow phosphorus always kept underwater?

Heating ammonium chloride will produce

i. A gas turns moist red litmus blue

ii. A gas turns moist blue litmus red

iii. Gases are highly soluble in water

1. Only (i)

2. (i) and (ii)

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

4. (ii) and (iii)

1. Paramagnetic character of solvated electrons is retained.
2. Solvated electrons associate to form electron-pairs and paramagnetic character decreases.
3. Reducing character is increased.
4. Reducing character is not affected.

Look at the following reaction:
$LiH+Al{H}_3⟶LiAl{H}_4$

Here $Al{H}_3$ and $LiH$ act as:

1. Lewis acid and Lewis base

2. Lewis base and Lewis acid

3. Bronsted base and Bronsted acid

4. None of these

1. Resonating structure of benzenering
2. Localization of $\pi$-electrons in phenoxideion
3. All of the above
4. Delocalization of $\pi$-electrons in phenoxide ion.

1. $O_2$ to $O_2^{2-}$
2. $\left[K_2\right(Ni\left(CN{)}_4\right]$ to $K_4\left[Ni\right(CN{)}_4]$
3. Both (a) & (b)
4. None of the above

Read the following and select one the correct answer:

Statement I: Alkali metals dissolve in liquid ammonia to give a blue solution

Statement II: Alkali metals dissolve in liquid ammonia to give solvated species of the type $\left[M\right(N{H}_3{)}_n{]}^{+}$

1. Statement I and Statement II are both correct. Statement II correctly explains Statement I

2. Statement I and Statement II are both correct. Statement II does not explain Statement I

3. Statement II is correct and Statement I is wrong

4. Statement I is correct and Statement II is wrong