JEE Questions for Chemistry Sblock Elements Quiz 6 - MCQExams.com

The name “Blue John” is given to which of the following compounds.
  • CaH2
  • CaF2
  • Ca3(PO4)2
  • CaO
Which of the following salts are composed of isoelectronic cations and anions ?
  • NaCl
  • MgF2
  • CaS
  • (and (both
Which of the following metal is used in the test of elements in organic compounds by Lassigne test ?
  • Li
  • Na
  • K
  • Rb
The setting time of dicalcium silicates is ‘‘_________ ’’
  • 28 days
  • 1 year
  • 1 week
  • 24 hour
The half life period of isotopes223 Fr is ....
  • 21 hour
  • 21 second
  • 21 minute
  • 21 day
Sylvite is the mineral of ...
  • K
  • Na
  • Li
  • Rb
Withrite is which type of salt of Barium ?
  • Carbonate
  • Sulphate
  • Chloride
  • Phosphate
Silastine is the mineral of ...
  • Ca
  • Ra
  • Ba
  • Sr
What will be final weight of 286 gm Na2CO3 .10H2O by Heating at 373 K ?
  • 206 gm
  • 162 gm
  • 186 gm
  • 124 gm
Which is not an ore of Ca ?
  • Lime stone
  • Flurospar
  • Dolomite
  • Epsomsalt
A certain metal is used to prepare an antacid, this metal accidentally catches fire which can not be put out by using CO2 based extiguishers. The metal is
  • C
  • Ca
  • Mg
  • Na
A metallic oxide reacts with water to form its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be
  • CaO
  • KO2
  • Li2O
  • Na2O2
Which one of the following is true?
  • NaOH is used in the concentration of bauxite ore
  • NaOH is a primary standard in volumetric analysis
  • Manganous hydroxide is soluble in excess of NaOH solution
  • NaOH solution does not react with Cl
Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H2O2 and O2?
  • Li2O
  • Na2 O2
  • NaO2
  • Na2 O
  • BeO
Aqueous solution of Na2 S2 O3 on reaction with Cl2 gives
  • Na 2 S4 O6
  • NaHSO4
  • NaCl
  • NaOH
Which of the following statements are correct for alkali metal compounds?
I. Superoxides are paramagnetic in nature.
II. The basic strength of hydroxides increases the group.
III. The conductivity of chlorides in their aqueous solutions decreases down the group.
IV. The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.
  • I, II, and III
  • I and II
  • II, III and IV
  • III and IV
Which of the following metals is extracted by the electrometallurgical method ?
  • Fe
  • Cu
  • Ni
  • Na
When carbon monoxide is passed over solid caustic soda heated to 200°C, it forms
  • Na2 CO3
  • NaHCO3
  • HCOONa
  • CH3 COONa
The element which on burning in air gives peroxide is
  • lithium
  • sodium
  • rubidium
  • caesium
Which one of the following will dissolve in water most readily?
  • I2
  • BaCO3
  • KF
  • PbI2
Which compound is used in photography?
  • Na2 SO5
  • Na2S2O8
  • Na2 S2 O6
  • Na2S2O3
A metal ' M' reacts with N2 to give a compound 'A' (M3 N). 'A' on heating at high temperature gives back 'Al' and 'A' on reacting with H2O gives a gas B. 'B' turns CuSO4 solution blue on passing through it. M and B can be
  • Al and NH3
  • Li and NH3
  • Na and NH3
  • Mg and NH3
A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of
  • Na2 S4O6
  • Fe2 (SO4 )3
  • Fe2 (S2 O3)3
  • Fe2 (S2 O3)2
Na 2 S2O3 is reduced by I2 to
  • Na2 S
  • Na2 SO4
  • NaHSO3
  • Na2S4O6
The ionic conductance is least for
  • Cs+
  • Rb+
  • K+
  • Na+
When Na reacts with liquid NH3 the following substance is formed
  • [Na (NH3)x]-
  • [e(NH3)y]-
  • NaNH2
  • Nax (NHy
Pick out the statement (s) which is/are not correct about the diagonal relationship of Li and Mg.
I. Polarising powers of Li+ and Mg2+ are almost same.
II. Like Li, Mg decomposes water very fast.
III. LiCl and MgCl2 are deliquescent.
IV. Like Li, Mg does not form solid bicarbonates.
  • I and II
  • II and III
  • Only II
  • Only I
  • II and IV
The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is
  • Hg (OH)2
  • Hg CO3 ∙ HgO
  • Hg CO3
  • Hg CO3 ∙ Hg (OH)2
The primary standard solution for the estimation of Na2 S2 O3 is
  • I2 solution
  • KMnO4
  • K2 Cr2 O7
  • oxalic acid
KO2 is used in space and submarines because it
  • absorbs CO2 and increases O2 concentration
  • absorbs moisture
  • absorbs CO2
  • produces ozone
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