### Chemistry - s-block Elements (Alkali and Alkaline earth Metals)

#### Question - 1

Which of the following are arranged in correct increasing order of solubilities?

• A ${ CaCO }_{ 3 }<{ KHCO }_{ 3 }<{ NaHCO }_{ 3 }$
• B ${ NaHCO }_{ 3 }<{ KHCO }_{ 3 }<{ CaCO }_{ 3 }$
• C ${ KHCO }_{ 3 }<{ NaHCO }_{ 3 }<{ CaCO }_{ 3 }$
• D ${ CaCO }_{ 3 }<{ NaHCO }_{ 3 }<{ KHCO }_{ 3 }$

#### Question - 2

Which of the following statements is correct for ${ CsBr }_{ 3 }$?

• A It is a covalent compound
• B It contains ${ Cs }^{ + }$ and $Br\begin{matrix} - \\ 3 \end{matrix}$ions
• C It cantains ${ Cs }^{ 3+ }$ and ${ Br }^{ - }$ions
• D it contains ${ Cs }^{ + }, { Br }^{ - }$ and ${ Br }_{ 2 }$ molecule

#### Question - 3

The alkail metals form salt-like hydride by the direct sunthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

• A $CsH>RbH>KH>NaH>LiH$
• B $KH>NaH>LiH>CsH>RbH$
• C $NaH>LiH>KH>RbH>CsH$
• D $LiH>NaH>KH>RbH>CsH$

#### Question - 4

Which pair of the following chlorides do not impart colour to the flame?

• A ${ Becl }_{ 2 }\quad and\quad { SrCL }_{ 2 }$
• B ${ BeCl }_{ 2 }\quad and\quad { MgCL }_{ 2 }$
• C ${ CaCl }_{ 2 }\quad and\quad { BaCL }_{ 2 }$
• D ${ Bacl }_{ 2 }\quad and\quad { SrCL }_{ 2 }$

#### Question - 5

A metal M readily forms its sulphate M${ SO }_{ 4 }$ which is water soluble. It forms its oxide MO which becomes inert on heating.  It forms its insoluble hydroxide $M{ \left( OH \right) }_{ 2 }$ which is soluble in NaOH.  Then M is

• A Be
• B Ba
• C Ca
• D Mg

#### Question - 6

$Ba{ SO }_{ 4 }$ is insoluble in water due to its

• A high hydration energy
• B high lattice energy
• C high ionisation energy
• D high kinetic energy

#### Question - 7

The correct order of mobility of the alkail metal ions in aqueous solution is

• A ${ Li }^{ + }>{ Na }^{ + }>{ K }^{ + }>{ Rb }^{ + }$
• B ${ Na }^{ + }>{ K }^{ + }>{ Rb }^{ + }>{ Li }^{ + }$
• C ${ K }^{ + }>{ Rb }^{ + }>{ Na }^{ + }>{ Li }^{ + }$
• D ${ Rb }^{ + }>{ K }^{ + }>{ Na }^{ + }>{ Li }^{ + }$

#### Question - 8

The correct sequence of increasing covalent character is represented by

• A $LiCL$
• B ${ BeCL }_{ 2 }$
• C NaCL
• D ${ BeCL }_{ 2 }$

#### Question - 9

Amphoteric hydroxides react with both alkalies and acides. Which of the following group 2 metal hydroxides is soluble in sodium hydroxide?

• A ${ Be\left( OH \right) }_{ 2 }$
• B ${ Mg\left( OH \right) }_{ 2 }$
• C ${ Ca\left( OH \right) }_{ 2 }$
• D ${ Ba\left( OH \right) }_{ 2 }$

#### Question - 10

Lif is almost insoluble in water whereas, LicL is soluble not only in water but also in acetone. This is because

• A of high hydration enthalpy of ${ Li }^{ + }$
• B of low hydration enthalpy of ${ Li }^{ + }$
• C of more ionic character in LiCI
• D None of the above