Anomalous Behavior of Lithium Halogens

Q. phenol associates in Benzene to a certain extent in dimerization reaction .A solution containing 0.02 kg of phenol in 1 kg of Benzene has its freezing point depression 0.69K hence degree of association of phenol dimerised will be

Q.

How does oxygen react with metals and non-metals?

Q. Phenol dissociates in benzene to certain extent to form a dimer .a solution containing 20g of phenol in 1 kg of benzene has its freezing point lowered by 0.69K .calculate the fraction of phenol that has dimerized (kf for benzene is 5.1K kg mol)

Q.

Ortho-nitrophenol is less soluble in water than p- and m-nitrophenols because

1. o-nitrophenol is more steam volatile than m- andp-isomers

2. o-nitrophenol shows intramolecular H-bonding

3. o-nitrophenol shows intermolecular H-bonding

4. Melting point of o-nitrophenol is lower than those of m-and p-isomers

Q. What is anomalous nature of lithium?

Q. Magnesium chloride crystallizes as

1. 
2. 
3. 
4. 

Q.

Increasing order of electronegativity is

1. Bi<P<S<Cl

2. P<Bi<S<Cl

3. Cl<S<Bi<P

4. S<Bi<P<Cl

Q. Which of the following alkali metal posses higher boiling and melting point?

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

Q.

54) How is sodium chloride extracted from sea water

Q. Which one of the following nitrates will leave behind a metal on strong heating?

1. Copper Nitrate
2. Silver nitrate
3. Ferric nitrate
4. Manganese nitrate

Q.

Crystals of covalent compounds always have

1. High melting points
2. Ions held together by electrostatic forces
3. Atoms as their structural units
4. Molecules as structural units

Q.

Present a comparative account of the alkali and alkaline earth metals with respect to the following charactieristics.

(i) Tendency to form ionic / covalent compounds

(ii) Nature fo oxides and their solubility in water

(iii) Formation of oxosalts

(iv) Solubility of oxosalts.

(v) Thermal stability of oxosalts.

Q. Paulings scale application formula and questions related to electronegativity using pauling scale

Q.

What color are alkaline earth metals?

Q.

Can too much bromine turn water green?

Q.

Which alkali metal is the softest?

Q. The correct statement(s) about $O_3$ is/are:

1. $O-O$ bond lengths are equal
2. Thermal decomposition of $O_3$ is exothermic
3. $O_3$ is paramagnetic in nature
4. $O_3$ has a bent structure

Q.

Which among the following is the least soluble?

1. ${\mathrm{BeF}}_2$

2. $\mathrm{LiF}$

3. ${\mathrm{MgF}}_2$

4. ${\mathrm{CaF}}_2$

Q. $Li$ does not resemble other alkali metals in which of the following properties:

1. $LiCl$ is predominantly covalent
2. $L{i}_{3}N$ is stable
3. All of the above
4. $L{i}_{2}C{O}_3$ decomposes into oxides while other alkali metal carbonates are thermally stable

Q.

Which of the following are the correct reasons for anomalous bhaviour of lithium?
(a) Exceptionally small size of its atom
(b) Its high polarising power
(c) It has the high degree of hydration
(d) Exceptionally low the enthalpy

Q. Indicate which nitrogen compound amongst the following would undergo Hofmann's reaction (i.e. reaction with$B{r}_2$ and strong KOH) to furnish the primary amine$(R-N{H}_2)$

1. 
2. 
3. 
4. 

Q.

Select the correct statements(s) with respect to oxides and oxoanions of transition metals.

1. Among oxides of chromium, $CrO$ is basic, $C{r}_2{O}_3$ is amphoteric and $Cr{O}_3$ is acidic

2. In an oxide, iron shows the highest oxidation state in $F{e}_2{O}_3$.

3. $Cr$ shows the highest oxidation state of +6 while $Mn$ shows the highest oxidation state of +7.

4. Vandium (V) oxide does not react with acids but reacts with alkalies only.

Q. Which of the following compounds will be coloured in solid state?

1. Cu₂Cl₂
2. ZnF₂
3. CuF₂
4. Ag₂SO₄

Q.

Cesium can be used for photoelectric cells not lithium. Why?

Q. The lightest metal is :

1. Li
2. Fe
3. Cu
4. Ag

Q. When $LiN{O}_3$ is heated, it gives oxide, $L{i}_{2}O$, whereas other alkali metal nitrates decompose to give corresponding :

1. nitrite
2. peroxide
3. both nitrite and oxide
4. none of these

Q.

The following questions relate to the extraction of aluminum by electrolysis:

Name the other aluminum-containing compound added to alumina and state its significance.

Q. A binary solid $\left(A^{+}{B}^{-}\right)$ has a zinc blende structure with $B^{-}$ ions constituting the lattice and $A^{+}$ ions occupying $25\%$ tetrahedral voids. The formula of solid is

1. $AB$
2. $A_{2}B$
3. $A{B}_2$
4. $A{B}_4$

Q.

In which solvent does NaCl have maximum solubility?

Q. Atomic hydrogen is allowed to combine on the surface to be welded to generate the temperature of
a)400K
b)3000K
c)4600K
d)4000K