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
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