JEE Questions for Chemistry Sblock Elements Quiz 2 - MCQExams.com

The correct order of the mobility of the alkali metal ions in aqueous solutions is
  • Na+ > K+ > Rb+ > Li+
  • K+ > Rb+ > Na+ > Li+
  • Rb+ >K+ > Na+ > Li+
  • Li+ > Na+ > K+ > Rb+
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?
  • RbCl
  • KCl
  • NaCl
  • LiCl
Which one of the following statements is correct for all the alkali metals?
  • Their nitrates on heating give NO2 and O2
  • Their carbonates decompose on heating to give CO2 and the metal oxide
  • They react with oxygen to give mainly the oxide M2O
  • They react with halogens to give the halides MX
  • They react with nitrogen to give nitrides
Which of the following is not correct?
  • Iodine oxidises sodium thiosulphate to sodium tetrathionate
  • Sodium thiosulphate is soluble in water
  • Ozone is used to identify the presence of unsaturation in alkenes
  • Sodium thiosulphate reacts with iodine to form sodium sulphate
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is
  • Ag
  • Ca
  • Cu
  • Cr
Baking powder is more commonly used to make cakes or bread 'rise'. Filler in baking powder is
  • NaHCO3
  • Ca (H2 PO4)2
  • starch
  • NaAl(SO4)2
The species that is not hydrolysed in water is
  • P4 O10
  • BaO2
  • Mg3 N2
  • CaC2
Which of the following substances has the highest melting point?
  • CaO
  • BiCl3
  • KCl
  • ClO2
Which of the following carbonates decomposes at lowest temperature?
  • MgCO3
  • CaCO3
  • SrCO3
  • BaCO3
In crystals of which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?
  • LiF
  • CsF
  • CsI
  • LiI
Which one of the following processes is used for the manufacture of calcium?
  • Reduction of CaO with carbon
  • Reduction of CaO with hydrogen
  • Electrolysis of a mixture of anhydrous CaCl2 and KCl
  • Electrolysis of molten Ca(OH)2
Chlorine reacts with 'X' to form bleaching powder. 'X' is
  • dry slaked lime
  • sodium hydroxide
  • acetone
  • chloral
Which of the following is not an ore of magnesium?
  • Carnallite
  • Dolomite
  • Calamine
  • Sea water
Which one of the following substances is used in the laboratory for a fast drying of neutral gases?
  • Phosphorus pentoxide
  • Active charcoal
  • Anhydrous calcium chloride
  • Na3 PO4
Setting of plaster of Paris involves
  • oxidation with atmospheric oxygen
  • combination with atmospheric CO2
  • dehydration
  • hydration to yield another hydrate
The solubilities of carbonates decrease down the magnesium group due to decrease in
  • lattice energies of solids
  • hydration energies of cations
  • interionic attraction
  • entropy of solution formation
The substance used in Holme's signal of the ship is a mixture of
  • CaC2 + Ca3 P2
  • Ca3 (PO4)2 + Pb3 O4
  • H3 PO4 + CaCl2
  • NH3 + HOCl
The substance not likely to contain CaCO3 is
  • a marble statue
  • calcined gypsum
  • sea shells
  • dolomite
Among the following, which is insoluble in water?
  • Sodium fluoride
  • Potassium fluoride
  • Beryllium fluoride
  • Magnesium fluoride
The chemical formula of plaster of Paris is
  • CaSO4 ∙ 1/2 H2O
  • CaSO4 ∙ H2O
  • CaSO4 ∙ 2 H2O
  • CaSO4 ∙ 3 H2O
The difference of water molecules in gypsum and plaster of Paris is
  • 5/2
  • 2
  • 1/2
  • 11⁄2
Which of the following is known as dead burnt plaster?
  • Gypsum
  • Plaster of paris
  • Anhydrite
  • None of the above
CaCl2 is used as
  • disinfectant
  • desiccating agent
  • medicine
  • None of these
Mixture of MgCl2 and MgO is called
  • Portland cement
  • Sorel's cement
  • double salt
  • None of these
What are the metal ions present in carnallite?
  • Mg, K
  • Al, Na
  • Na, Mg
  • Zn, Mg
Which metal is present in chlorophyll?
  • Ca
  • Co
  • Zn
  • Mg
Milk of magnesia is used as
  • antichlor
  • antacid
  • antiseptic
  • food preservative
Ionic compound BaSO4 is insoluble in water due to
  • high lattice energy
  • low lattice energy
  • low hydration energy
  • Both (and (3)
A metal M forms water soluble MSO4 and inert MO. MO in aqueous solution forms insoluble M(OH)2 soluble in NaOH. Metal M is
  • Be
  • Mg
  • Ca
  • Si
Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
  • Rb
  • K
  • Li
  • Na
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