The S Block Elements CBSE Questions & Answers

The S Block Elements

This is Chemistry Class 11 The s Block Elements CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of:
  • A
    Lime
  • B
    Plaster of Paris
  • C
    Portland cement
    Correct
  • D
    Slaked lime
2
Cement is an industrially important compound of
  • A
    Potassium
  • B
    Magnesium
  • C
    Sodium
  • D
    Calcium
    Correct
3
The alkali metals are low melting. Which of the following alkali metal is expected? to melt if the room temperature rises to \({\text{3}}0^\circ {\text{C}}?\)
  • A
    Na
  • B
    Cs
    Correct
  • C
    Rb
  • D
    K
4
Alkali metals react with water vigorously to form hydroxides and dihydrogen.Which of the following alkali metals reacts with water least vigorously?
  • A
    Cs
  • B
    Na
  • C
    Li
    Correct
  • D
    K
5
The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.
  • A
    Sublimation enthalpy
  • B
    Hydration enthalpy
  • C
    Ionisation enthalpy
  • D
    Electron-gain enthalpy
    Correct
6
Metal carbonates decompose on heating to give metal oxide and carbondioxide. Which of the metal carbonates is most stable thermally?
  • A
    \({\text{Ca C}}{{\text{O}}_{\text{3}}}\)
  • B
    \({\text{BaC}}{{\text{O}}_{\text{3}}}\)
    Correct
  • C
    \({\text{Mg C}}{{\text{O}}_{\text{3}}}\)
  • D
    \({\text{Sr C}}{{\text{O}}_{\text{3}}}\)
7
The diagonal relationship exists between
  • A
    Lithium and magnesium
    Correct
  • B
    Lithium and beryllium
  • C
    Lithium and aluminium
  • D
    Beryllium and magnesium
8
Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
  • A
    \({\text{Mg}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
    Correct
  • B
    \({\text{Ca}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
  • C
    \({\text{Sr}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
  • D
    \({\text{Ba}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
9
Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
  • A
    \({\text{CaC}}{{\text{l}}_{\text{2}}}\)
  • B
    \({\text{MgC}}{{\text{l}}_{\text{2}}}\)
  • C
    \({\text{BeC}}{{\text{l}}_{\text{2}}}\)
    Correct
  • D
    \({\text{SrC}}{{\text{l}}_{\text{2}}}\)
10
The order of decreasing ionisation enthalpy in alkali metals is
  • A
    Rb < Na < K < Li
  • B
    Li > Na > K > Rb
    Correct
  • C
    Na > Li > K > Rb
  • D
    K < Li < Na < Rb
11
The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of LiF in water is due to
  • A
    Low ionisation enthalpy of lithium atom
  • B
    Ionic nature of lithium fluoride
  • C
    High lattice enthalpy
    Correct
  • D
    High hydration enthalpy for lithium ion.
12
Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
  • A
    \({\text{Be}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
    Correct
  • B
    \({\text{Ca}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
  • C
    \({\text{Ba}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
  • D
    \({\text{Mg}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
13
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with \({\text{Ca}}\left( {{\text{OH}}} \right){\text{2}}\). The by-product obtained in this process is
  • A
    \({\text{NaHC}}{{\text{O}}_{\text{3}}}\)
  • B
    \({\text{CaC}}{{\text{l}}_{\text{2}}}\)
    Correct
  • C
    NaCl
  • D
    NaOH
14
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
  • A
    ammoniated sodium ion
  • B
    sodium amide
  • C
    sodium ion
  • D
    ammoniated electron
    Correct
15
By adding gypsum to cement
  • A
    setting time of cement increases.
    Correct
  • B
    colour of cement becomes light.
  • C
    shining surface is obtained.
  • D
    setting time of cement becomes less .