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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 3
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Q.1
Among the following oxides, the one which is most basic is ..[CBSE PMT 1994]
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a) ZnO
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b) MgO
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c)Al2O3
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d)N2O5
Explanation
N2O5 is acidic ZnO and Al2O3 is amphotericMgO is basic Answer:(b)
Q.2
White enamel of our teeth is ..[Bihar CET 1995]
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a) Ca3(PO4)2
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b) CaF2
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c) CaCl2
0%
d) CaBr2
Explanation
The primary mineral is hydroxyapatite, which is a crystalline calcium phosphate. Answer: (a)
Q.3
Epsom salt is the hydrate of one of the following .. [CPMT 1990]
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a)Magnesium sulphate
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b) Ferrous ammonium sulphate
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c)Magnesium ammonium phosphate
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d)Calcium sulphate
Explanation
Epsom salt is MgSO4 . 7H2OAnswer: (a)
Q.4
The decreasing order of the second ionization potential of K, Ca, Ba is ...[ IIT 1993]
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a) K > Ca > Ba
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b) Ca > Ba > K
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c)Ba > K > Ca
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d)K > Ba > Ca
Explanation
second ionization energy of K is highest because second electron is to be lost from inert gas core. Further because of large size of Ba its second ionization energy is lowered than smaller size CaAnswer: (a)
Q.5
Among the metals Be, Mg, Ca and Sr of group 2 ( or group IIA) of the periodic table, the least ionic chloride would be formed by.. [ DEC 1994]
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a) Mg
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b) Be
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c)Ca
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d)Sr
Explanation
Due to high electronegativity and ionization potential Be will form covalent chloride Answer:(c)
Q.6
The atomic numbers of four elements are given below. Which one is an alkaline earth metal ..[AMU 1992]
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a)10
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b) 20
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c)30
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d)40
Explanation
Alkaline earth metals have two electrons more than the inert gas , Ar=18 which is inert gas , thus atomic number 20 must be Alkaline earth metalAnswer: (b)
Q.7
Which of the following imparts brick red colour to the flame? [ AFMC 1994]
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a) Ca
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b) Ba
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c)Sr
0%
d)None of the above
Explanation
Answer: (a)
Q.8
Presence of which of the following slat increases the rate of setting of plaster of paris
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a)NaCl
0%
b) KCl
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c)BaSO4
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d)CuSO4
Explanation
Presence of NaCl increases the rate of setting of plaster of paris while borax or alum retard it Answer:(a)
Q.9
Sodium nitrate decomposes above 800°C to give ... [ IIT 1998]
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a)N2
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b) O2
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c)NO2
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d)Na3O
Explanation
2NaNO3 → 2NaNO2 + O2Answer: (a)
Q.10
Which one of the following substance is used in laboratory for fast drying of neutral gases? .. [ CBSE PMT 1992]
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a)Phosphorous pentaoxide
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b) Active charcoal
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c)Anhydrous calcium chloride
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d)Na3PO4
Explanation
Phosphorus pentoxide is a potent dehydrating agent as indicated by the exothermic nature of its hydrolysis: P4O10 + 6 H2O → 4 H3PO4 (–177 kJ) A granular form of P4O10 is used in desiccators. Answer: (a)
Q.11
To a clear solution of compound (X), a solution of BaCl2 is added and a heavy white precipitate is formed which does not dissolve in dil. HCl. the compound (X) is ..[ DEC 1994]
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a) A nitrate
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b) A bromide
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c)A sulphate
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d)A carbonate
Explanation
Only sulphate reacts with BaCl2 solution to form a white ppt. of BaSO4, which is insoluble in dil HClAnswer: (c)
Q.12
Which of the following salts does not impart a colour to the flame? [ Pb CET 1995]
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a) LiCl
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b) KCl
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c)MgCl2
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d)CaCl2
Explanation
Mg has very high ionization enthalpy which can be provided by Bunsen burner thus MgCl2 does not impart any colour to the flame Answer:(c)
Q.13
Calcium is obtained by the .. [ MP PMT 1996]
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a) Electrolysis of molten CaCl2
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b) Electrolysis of solution of CaCl2 in water
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c) Reduction of CaCl2 with carbon
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d) Roasting of lime
Explanation
Answer: (a)
Q.14
Amongst the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature ( about 25°C) is ..[IIT 1990]
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a)Mg(OH)2
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b) Ca(OH)2
0%
c)Ba(OH)2
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d)Be(OH)2
Explanation
Be(OH)2 is lowest soluble implies lowest KspAnswer: (d)
Q.15
Among the following: NaOH, Ca(OH)2, KOH and Zn(OH)2, the weakest base is ..[KCET 1993]
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a) NaOH
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b) Ca(OH)2
0%
c)KOH
0%
d)Zn(OH)2
Explanation
Except Zn(OH)2 all others are hydroxides of alkali and alkaline earth metals thus are very strong baseAnswer: (d)
Q.16
Beryllium is placed above magnesium in the second group. Beryllium dust, therefore, when added to MgCl2 solution will ...[DPMT 1994]
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a)Have no effect
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b) Precipitate Mg metal
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c)Precipitate MgO
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d)Lead to dissolution of beryllium metal
Explanation
Beryllium is weaker reducing agent than Mg, thus Mg cannot reduce to Mg2+ ions to Mg metal, thus have no effect Answer:(a)
Q.17
The solubility in water of sulphate's down the Be group is Be > Mg > Sr > Ba. This is due to.. [ CBSE PMT 1995]
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a) High heat of solution for smaller ions like BE2+
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b) Increasing molecular weight
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c) Decreasing lattice energy
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d) Increase in melting points
Explanation
Answer: (a)
Q.18
Electron configuration of calcium atom may be written as .. [ CBSE PMT 1992]
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a)Ne, 4p2
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b) Ar, 4s2
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c)Ne, 4s2
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d)Ar, 4p2
Explanation
Answer: (b)
Q.19
Melting point of calcium halides decreases in order .. [ CPMT 1993]
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a) CaF2 > CaCl2 > CaBr2 > CaI2
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b) CaI2 > CaBr2 > CaCl2 > CaF2
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c)CaBr2 > CaI2 >CaF2 > CaCl2
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d)CaCl2 > CaBr2 > CaI2 > CaF2
Explanation
As the size of anion increases covalent character increases thus the melting point decreasesAnswer: (a)
Q.20
The one which does not show variable valency is ..[ Pb CET 1997]
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a)Barium
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b) Titanium
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c)Copper
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d)Lead
Explanation
Barium belongs to s block element shows only single valency while other belongs to 'p' block elements shows multiple valencyAnswer: (a)
Q.21
The compounds of alkaline earth metals have the following magnetic nature .. [ MP PMT 1998]
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a) Diamagnetic
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b) paramagnetic
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c)ferromagnetic
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d)Anti ferromagnetic
Explanation
Alkaline earth metals forms M2+ ions in their compounds thus leaving all paired electrons in (n-1)s2p6 configuration and are diamagneticAnswer: (a)
Q.22
Limestone is not used in which of the following manufacturing process?
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a) Phosphorus from phosphate
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b) Iron from haematite
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c)Solvay process of sodium carbonate
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d)Portland cement
Explanation
Answer:(a)
Q.23
Carnallite on electrolysis gives [ Kerala MEE 2003]
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a) Ca and Cl2
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b) Na and CO2
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c) Mg and Cl2
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d) K and CO2
Explanation
Carnallite is ore of Mg ( MgCl2 KCl . 6H2O) on electrolysis gives Mg at cathode and Cl2 at anode Answer: (c)
Q.24
Alkaline earth metals form ions of the general formula ..[Pb CET 1997]
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a)M2+
0%
b) M+
0%
c)M
0%
d)M2-
Explanation
Answer: (a)
Q.25
he solubility in water of sulphates down the Be group is Be > Mg > Ca > Sr > Ba. This is due to ..[AIIMS 1999]
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a) High ionization energy
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b) Increase in melting point
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c)Higher coordination number
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d)All of these
Explanation
In crystalline sulphates, the coordination number of the ions increases from Be and so the lattice energy. thus, the solubility in water decreasesAnswer: (c)
Q.26
Which of the following has maximum ionization energy> [ Bihar CEE 2002]
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a) Ba → Ba+ + e-
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b) Be → Me+ + e-
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c)Ca → Ca2+ + 2e-
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d)Mg → Mg2+ + 2e-
Explanation
Answer:(d)
Q.27
The solubility of carbonates decrease down the magnesium group due to a decrease in ...[AIEEE 2003]
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a) Hydration energies of cations
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b) Inter ionic interaction
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c) Entropy of solution formation
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d) Lattice energies of solids
Explanation
Answer: (a)
Q.28
For two ionic solids CaO and KI, identify the wrong statement among the following? [ CBSE PMT 1997]
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a)Lattice energy of CaO is much higher than that of KI
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b) KI is soluble in benzene
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c)CaO has high m.p.
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d)KI has high m.p.
Explanation
Due to lower lattice energy of KI melting point of KI is much lower than CaOAnswer: (d)
Q.29
halides of alkaline earth metals form hydrates such as MgCl2 . 6H2O, CaCl2.6H2O, BaCl2 . 2H2O and SrCl2 .2H2O. This shows that halides of group 2 elements ... [ Roorkee Screeing Test 2000]
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a) Are hygroscopic in nature
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b) Act as dehydrating agents
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c)Can absorb moisture from air
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d)All of the above
Explanation
Answer: (d)
Q.30
Which of the following process is used in the extractive metallurgy of magnesium? [ IIT screening 2002]
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a) Fused salt electrolysis
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b) Self reduction
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c)Aqueous solution electrolysis
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d)Thermite reduction
Explanation
Answer:(a)
0 h : 0 m : 1 s
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