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
Dead burnt plaster is
  • A
    \({\text{CaS}}{{\text{O}}_{\text{4}}}\)
    Correct
  • B
    \({\text{CaS}}{{\text{O}}_{\text{4}}}.{\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • C
    \({\text{CaS}}{{\text{O}}_{\text{4}}}.{\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • D
    \({\text{CaS}}{{\text{O}}_{\text{4}}}.{\text{12 }}{{\text{H}}_{\text{2}}}{\text{O}}\)
2
Suspension of slaked lime in water is known as
  • A
    lime water
  • B
    milk of lime
    Correct
  • C
    quick lime
  • D
    aqueous solution of slaked lime
3
Which of the following elements does not form hydride by direct heating with dihydrogen?
  • A
    Sr
  • B
    Be
    Correct
  • C
    Ba
  • D
    Mg
4
The formula of soda ash is
  • A
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}\)
    Correct
  • B
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}.{\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • C
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}.{\text{ 1}}0{\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • D
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}.{\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
5
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is
  • A
    Barium nitrate
  • B
    Magnesium nitrate
  • C
    Strontium nitrate
  • D
    Calcium nitrate
    Correct
6
Which of the following statements is true about Ca(OH)2?
  • A
    It is a light blue solid
  • B
    It does not possess disinfectant property.
  • C
    It is used in the preparation of bleaching powder
    Correct
  • D
    It is used in the manufacture of cement.
7
A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
  • A
    \({\text{Ca }}{\left( {{\text{HC}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}\)
  • B
    \({\text{Ca}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
    Correct
  • C
    CaO
  • D
    \({\text{CaC}}{{\text{O}}_{\text{3}}}\)
8
Dehydration of hydrates of halides of calcium, barium and strontium i.e., \({\text{CaC}}{{\text{l}}_{\text{2}}}{\text{6}}{{\text{H}}_{\text{2}}}{\text{O}},\) \({\text{BaC}}{{\text{l}}_{\text{2}}}.{\text{2 }}{{\text{H}}_{\text{2}}}{\text{O}},{\text{ SrC}}{{\text{l}}_{\text{2}}}.{\text{2 }}{{\text{H}}_{\text{2}}}{\text{O}},\) can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
  • A
    Tendency to form hydrate decreases from calcium to barium
  • B
    can absorb moisture from air
  • C
    act as dehydrating agent
  • D
    All of these
    Correct
9
Choose the correct statements from the following.
  • A
    Beryllium exhibits coordination number more than four.
  • B
    Beryllium sulphate is insoluble in water as the greater lattice enthalpy factor of \({\text{B}}{{\text{e}}^{{\text{2}} + }}\) overcomes the hydration enthalpy.
  • C
    Beryllium oxide is purely acidic in nature.
  • D
    Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
    Correct
10
Identify the correct formula of halides of alkaline earth metals from the following.
  • A
    \({\text{CaC}}{{\text{l}}_{\text{2}}}.{\text{3}}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • B
    \({\text{BaC}}{{\text{l}}_{\text{2}}}.{\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}\)
    Correct
  • C
    \({\text{BaC}}{{\text{l}}_{\text{2}}}.{\text{4}}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • D
    \({\text{SrC}}{{\text{l}}_{\text{2}}}.{\text{4}}{{\text{H}}_{\text{2}}}{\text{O}}\)
11
Several sodium compounds find use in industries. Which of the following ompounds are used for textile industry?
  • A
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\)
  • B
    NaCl
  • C
    \({\text{NaHC}}{{\text{O}}_{\text{3}}}\)
  • D
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}\)
    Correct
12
Which of the following compounds are readily soluble in water?
  • A
    \({\text{BaS}}{{\text{O}}_{\text{4}}}\)
  • B
    \({\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\)
  • C
    \({\text{SrS}}{{\text{O}}_{\text{4}}}\)
  • D
    \({\text{BeS}}{{\text{O}}_{\text{4}}}\)
    Correct
13
When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?
  • A
    \({{\text{O}}^{2 - }}\) ions
  • B
    \({{\text{H}}^ + }\) ions
    Correct
  • C
    \(S{\text{O}}_4^{2 - }\) ions
  • D
    \({\text{M}}{{\text{g}}^{{\text{2}} + }}\)ions
14
Which of the following are the correct reasons for anomalous behaviour of lithium?
  • A
    It has high degree of hydration
  • B
    Its low polarising power
  • C
    Exceptionally low ionisation enthalpy
  • D
    Exceptionally small size of its atom
    Correct
15
Magnesium do not impart any colour to the flame because
  • A
    The electrons in magnesium are too strongly bound to get excited
    Correct
  • B
    Low thermal conductivities
  • C
    The electrons in magnesium are too loosly bound to get excited
  • D
    Low absorption of light energy