MP, BP and Density (Group 1)

Q. Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point

1. KCL
2. Licl
3. NaCl
4. RbCl

Q. The highest melting point among alkali metal is

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

Q. Sodium has body centered packing. Distance between two nearest atoms is 3.7A°. The lattice parameter is

Q. Which among the following alkali metal has the highest density ?

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

Q. The metal with high melting point in 4d series is

1. $Tc$
2. $Mo$
3. $Cr$
4. $W$

Q.

Mention the type of compounds formed when small atoms like $H,C\text{and}N$ get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.

Q. Which of the following statement is incorrect for group 15 elements ?

1. Order of ionization enthalpies is ${\Delta }_i{H}_1<{\Delta }_i{H}_2<{\Delta }_i{H}_3$
2. The boiling point and melting point continously increases from top to bottom in the group
3. Dinitrogen is a gas while all others are solids
4. All of the above

Q.

The alkali metals are low melting . Which of the following alkali metal is expected to melt if the room temperature rises to ${30}^{\circ }$C?
(a) Na (b) K (c) Rb (d) Cs

Q. Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

1. $RbCl$
2. $KCl$
3. $NaCl$
4. $LiCl$

Q. Lattice energy and hydration energy are two important properties of ionic solids on which their melting point, boiling point and solubility depend. Lattice energy increases as the charge on the ion increases and the size decreases. Hydration energy increases as the size of the ion decreases and charges on it increases.
The solubilities of carbonates, sulphates and phosphates of alkaline earth metals are much less than those of the corresponding alkali metals. This is because:

1. alkaline earth salts have lattice energy which is almost the same as those of alkali metal salts
2. lattice energy of alkaline earth metal salts are lesser than their hydration energy
3. hydration energy of alkali metal salts are much lesser than those of corresponding alkaline earth metal salts
4. alkaline earth metal cations are more strongly held to the anions than the corresponding alkali metal cations

Q. Arrange the following in increasing lattice energy.

Q. The strongest reducing agent of the alkali metal is:-

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

Q. Assertion :$BaS{O}_4$ is insoluble in water. Reason: Lattice energy of $BaS{O}_4$ is higher than its hydration energy.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Assertion :Melting point of $Mn$ is more than that of $Fe$. Reason: $Mn$ has higher number of unpaired $e^{-}$ than $Fe$ in atomic state.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. The lightest gas is :

1. oxygen
2. helium
3. nitrogen
4. hydrogen

Q. Arrange the following in increasing lattice energy: $L{i}_{2}C{O}_3,N{a}_{2}C{O}_3,K_{2}C{O}_3$.

Q. element X forms chloride with formula XCl_4 which is a solid with low melting point. In which group and period be X place

Q. $C{O}_2$ and $Si{O}_2$ is a solid or gas ?

1. $C{O}_2$ gas and $Si{O}_2$ solid
2. $C{O}_2$ solid and $Si{O}_2$ gas
3. $C{O}_2$ gas and $Si{O}_2$ gas
4. $C{O}_2$ solid and $Si{O}_2$ solid

Q. Based on lattice energy and other considerations which one of the following alkali metal chloride is expected to have highest melting point?

1. $KCl$
2. $RbCl$
3. $LiCl$
4. $NaCl$

Q.

why melting point of para isomers are higher than ortho and meta isomers??

Q.

which of the following has lowest melting point?

CaCl2, CaBr2, CaI2, CaF2

Q. Select the correct order of density.

1. Na > K
2. Na < K
3. Mg > Ca
4. Mg < Ca

Q. $Be{F}_2$ is soluble in water, whereas the fluorides of other alkaline earth metals are insoluble because of:

1. covalent nature of $Be{F}_2$
2. greater hydration energy of $B{e}^{2+}$ ion as compared to crystal lattice
3. none of these
4. ionic nature of $Be{F}_2$

Q.

Which of the following has the lowest melting point?

1. Li

2. Na

3. Cs

4. K

Q. The desiccants used for absorbing water during Liebig's method for estimation of carbon and hydrogen are:

1. anhydrous $N{a}_{2}S{O}_4$
2. $MgS{O}_4.7H_{2}O$
3. $Mg(Cl{O}_4{)}_2$
4. anhydrous $CaC{l}_2$

Q. The metal with the lowest density is :

1. $Mg$
2. $Li$
3. $Ag$
4. $Au$

Q. $\beta$ sulphur is stable between :

1. ${114}^{o}C$ to ${160}^{o}C$
2. ${95.6}^{o}C$ to ${119}^{o}C$
3. ${160}^{o}C$ to ${230}^{o}C$
4. ${112.8}^{o}C$ to ${140}^{o}C$

Q. The low solubility of LiF and that of CsI in water are respectively due to which of the properties of the alkali metal ions?

1. Higher hydration enthalpy of $L{i}^{+}$, higher lattice enthalpy of $C{s}^{+}$
2. Smaller hydration enthalpy of $L{i}^{+}$, higher lattice enthalpy of $C{s}^{+}$
3. Smaller lattice enthalpy of $L{i}^{+}$, higher hydration enthalpy of $C{s}^{+}$
4. Higher lattice enthalpy of $L{i}^{+}$, Smaller hydration enthalpy of $C{s}^{+}$

Q. Based on lattice energy and other considerations which one of the following alkali metal chloride has the highest melting point?

1. $NaCl$
2. $KCl$
3. $RbCl$
4. $LiCl$