Alkali Metals questions answers:
Ques. The product obtained on fusion of BaSO4 and Na2CO3 is
(a) BaCO3
(b) BaO
(c) Ba(OH)2
(d) BaHSO4
Ques. When NaOH crystals are left in open air, they acquire a fluid layer around each crystal as
(a) They start melting
(b) They absorb moisture from air
(c) They react with air to form a liquid compound
(d) They absorb CO2 from air
Ques. On heating anhydrous Na2CO3, … is evolved
(a) CO2
(b) Water vapour
(c) CO
(d) No gas
Ques. Identify the correct statement
(a) Elemental sodium can be prepared and isolated by electrolysing an aqueous solution of sodium chloride
(b) Elemental sodium is a strong oxidizing agent
(c) Elemental sodium is insoluble in ammonia
(d) Elemental sodium is easily oxidized
Ques. Cryolite helps in
(a) Lowering the melting point
(b) Increasing the melting point
(c) Increasing the electrical conductivity
(d) Decreasing the electrical conductivity
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Ques. As compared to lithium, sodium reacts quickly with water because
(a) Its molecular weight is less
(b) It is stronger electronegative
(c) It is stronger electropositive
(d) It is a metal
Ques. Causticization process is used for the preparation of
(a) Caustic soda
(b) Caustic potash
(c) Baryta
(d) Slaked lime
Ques. The most dangerous method of preparing hydrogen would be by the action of HCl and
(a) Al
(b) K
(c) Fe
(d) Zn
Ques. The reagent commonly used to determine hardness of water titrimetrically is
(a) Oxalic acid
(b) Disodium salt of EDTA
(c) Sodium citrate
(d) Sodium thiosulphate
Ques. Nelson cell is used for the preparation of
(a) Slaked lime
(b) Baryta
(c) Sodium
(d) Caustic soda
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Ques. Which alkali metal is most metallic in character
(a) K
(b) Cs
(c) Na
(d) Li
Ques. The solubility of the alkali metal carbonates
(a) Increases at first and then decreases
(b) Does not show regular variation
(c) Increases as we go down the group
(d) Decreases as we go down the group
Ques. Sodium thiosulphate (Na2S2O3.5H2O) is used in photography to
(a) Reduce silver bromide to metallic silver
(b) Convert metallic silver to silver salt
(c) Remove undecomposed AgBr as a soluble silver thiosulphate complex
(d) Remove unreduced silver
Ques. The process of industrial manufacturing of sodium carbonate is known as
(a) Castner process
(b) Haber’s process
(c) Le-blanc process
(d) Chamber process
Ques. Alkali metals are
(a) Li, Na, Be, Mg, Cs
(b) Li, Na, K, Rb, Cs
(c) Na, K, Mg, Ca, Rb
(d) K, Rb, Cs, Ba, Sr
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Ques. The metal which reacts with water at room temperature is
(a) Copper
(b) Iron
(c) Magnesium
(d) Sodium
Ques. The alkali metal that reacts with nitrogen directly to form nitride is
(a) Li
(b) Na
(c) K
(d) Rb
Ques. In the Castner’s process for the extraction of sodium, the anode is made of…….metal.
(a) Copper
(b) Iron
(c) Sodium
(d) Nickel
Ques. Slaked lime [Ca(OH)2] is used in the manufacture
(a) Cement
(b) Fire bricks
(c) Pigment
(d) Medicine
Ques. With the increase in atomic weights, melting points of the alkali metals
(a) Increase
(b) Decrease
(c) Remain constant
(d) Do not show definite trend
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Ques. Which has minimum solubility
(a) Br2S3
(b) Ag2S
(c) CoS
(d) PbS
Ques. Which one of the following is used as a disinfectant in water treatment?
(a) Alum
(b) Charcoal
(c) Kieselguhr
(d) Potassium permanganate
Ques. The substance used to decolourise and purify oils is
(a) Sodium carbonate
(b) Sodium chloride
(c) Sodium hydroxide
(d) Sodium sulphate
Ques. Excess of Na+ ions in our system causes
(a) High B.P.
(b) Low B.P.
(c) Diabetes
(d) Anaemia
Ques. Which of the following properties is not true for an alkali metal
(a) Low atomic volume
(b) Low ionization energy
(c) Low density
(d) Low electronegativity
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Ques. On dissolving moderate amount of sodium metal in liquid NH3 at low temperature, which one of the following does not occur
(a) Blue coloured solution is obtained
(b) Na+ ions are formed in the solution
(c) Liquid NH3 becomes good conductor of electricity
(d) Liquid ammonia remains diamagnetic
Ques. The word ‘alkali’ is used for alkali metals indicates
(a) Ash of the plants
(b) Metallic nature
(c) Silvery lusture
(d) Active metal
Ques. NaOH is prepared by the method
(a) Down’s cell
(b) Castner cell
(c) Solvay process
(d) Castner Kellner cell
Ques. The strongest reducing agent is
(a) K
(b) Al
(c) Mg
(d) Br
Ques. Characteristic feature of alkali metals is
(a) Good conductor of heat and electricity
(b) High melting points
(c) Low oxidation potentials
(d) High ionization potentials
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Ques. In the manufacture of metallic sodium by the fused salt electrolysis (Down’s process) a small amount of calcium chloride is added to
(a) Improve the electrical conduction
(b) Increase the temperature of electrolysis
(c) Bring down the melt temperature
(d) Stabilize the metallic sodium
Ques. Photoelectric effect is maximum in
(a) Cs
(b) Na
(c) K
(d) Li
Ques. Electrolysis of molten sodium chloride leads to the formation of
(a) Na and H2
(b) Na and O2
(c) H2 and O2
(d) Na and Cl2
Ques. Which of the following metal has stable carbonates
(a) Na
(b) Mg
(c) Al
(d) Si
Ques. Aluminium reacts with caustic soda to form
(a) Aluminium hydroxide
(b) Aluminium oxide
(c) Sodium meta-aluminate
(d) Sodium tetra aluminate
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Ques. The colour given to the flame by sodium salts is
(a) Light red
(b) Golden yellow
(c) Green
(d) Pink
Ques. A substance X Â is a compound of an element of group IA the substance X gives a violet colour in flame test, X is
(a) LiCl
(b) NaCl
(c) KCl
(d) None
Ques. Na imparts yellow colour to Bunsen flame because of
(a) Low ionisation potential
(b) Sensitivity
(c) Sublimation
(d) Absorbed high radiation
Ques. The main salt soluble in sea water is
(a) MgCl2
(b) NaCl
(c) MgSO4
(d) CaSO4
Ques. When CO is passed over solid NaOH heated to 200oC, it forms
(a) Na2CO3
(b) NaHCO3
(c) HCOONa
(d) None
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Ques. When NaOH is prepared, the gas released is
(a) Cl2
(b) H2
(c) O2
(d) H2O
Ques. Lithium shows similarities to magnesium in its chemical behaviour because
(a) Similar size, greater electronegativity and similar polarizing power.
(b) Similar size same electronegativity and lower polarizing power
(c) Similar size, same electronegativity and similar high polarizing power
(d) None of these
Ques. Sodium metal is extracted by
(a) Electrolysis of aqueous solution of sodium chloride
(b) Electrolysis of fused sodium chloride
(c) Heating sodium oxide with carbon
(d) Heating sodium oxide with hydrogen
Ques. In the preparation of sodium carbonate, which of the following is used
(a) Slaked lime
(b) Quick lime
(c) Lime stone
(d) NaOH
Ques. Calcium is obtained by
(a) Roasting of limestone
(b) Electrolysis of solution of calcium chloride in H2O
(c) Reduction of calcium chloride with carbon
(d) Electrolysis of molten anhydrous calcium chloride
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Ques. The colour of the precipitate produced by adding NaOH solution to HgCl2 is
(a) Yellow
(b) Black
(c) Brown
(d) White
Ques. The alum used for purifying water is
(a) Ferric alum
(b) Chrome alum
(c) Potash alum
(d) Ammonium alum
Ques. Which one of the following is the most electropositive element
(a) Calcium
(b) Chlorine
(c) Potassium
(d) Carbon
Ques. Sodium when heated in a current of dry ammonia gives
(a) Sodium nitrite
(b) Sodium hydride
(c) Sodium amide
(d) Sodium azide
