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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 4
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Q.1
Which is insoluble in water?
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a) H2O
0%
b) HgCl2
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c) Ca(NO3)2
0%
d) CaF2
Explanation
Answer: (c)
Q.2
The first ionization potentials (eV) of Be and B respectively are ..[ CBSE PMT 1998]
0%
a)8.29, 9.32
0%
b) 9.32, 9.32
0%
c)8.29, 8.29
0%
d)9.23, 8.29
Explanation
The first ionization potential of Be(1s2, 2s2) is more than that of B(2s2, 2s2, 2p1)Answer: (d)
Q.3
Plaster of paris is used .. [ CPMT 2000]
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a) As a plaster for walls
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b) In dentistry and surgery
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c)In metallurgical process
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d)As drying agent
Explanation
Answer: (a)
Q.4
The reaction of slaked lime with Cl2 gas gives.. [ kerala MEE 2000]
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a)only Ca(OCl)2
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b) only CaCl2
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c)Mixture of ca(OCl)2, Ca(OH)2, CaCl2 and H2O
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d)baryta water
Explanation
Ca(OH)2 + Cl2 → CaOCl2 + H2O bleaching powder is a mixture of calcium hypochlorite. Ca(CCl)2 and calcium chloride Answer:(c)
Q.5
Which of the following ion forms a hydroxide highly soluble in water? [ DPMT 1979]
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a) Ni2+
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b) K+
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c) Zn2+
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d) Al3+
Explanation
Answer: (b)
Q.6
One which is not dissolved by dilute hydrochloric acid is .. [ P. CET 1997]
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a)ZnS
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b) MnS
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c)BaCO3
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d)BaSO4
Explanation
Answer: (d)
Q.7
Which of the following is incorrect
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a) Mg burns in air releasing dazzling light rich in UV rays
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b) CaCl2 . 6H2O when mixed with ice gives freezing mixture
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c)Mg cannot form complex
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d)Be can form complexes due to its very small size
Explanation
Mg can form complexes and chlorophyll is one of such examplesAnswer: (c)
Q.8
On heating quick lime with coke in an electric furnace, we get ..[AIIMS 2001]
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a) Ca and CO2
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b) CaCO3
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c)CaO
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d)CaC2
Explanation
CaO + 3C → CaC2 + CO Answer:(d)
Q.9
In curing cement plaster, water is sprinkled from time to time. This helps in .... [ AIEEE2003]
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a) Developing interlocking needle like crystals of hydrated silicates
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b) Hydrated sand gravel mixed with cement
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c) Converting sand into silicic acid
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d) keeping it cool
Explanation
Answer: (a)
Q.10
the correct order of increasing ionic character is ..[AFMC 1998]
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a)BeCl2 < MgCl2 < CaCl2 < BaCl2
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b) BeCl2 < MgCl2 < BaCl2 < CaCl2
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c)BeCl2 < BaCl2 < MgCl2 < CaCl2
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d)BaCl2 < CaCl2 < MgCl2 < BeCl2
Explanation
Ionic character of chlorides increases as the size of the cation increases from Ne2+ to Ba2+Answer: (a)
Q.11
Among the alkaline earth metals, the element forming predominantly covalent compound is ..[MP CEE 1999]
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a) Ba
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b) Sr
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c)Ca
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d)Be
Explanation
Due to small size of Be and greater polarising action on anion, Be forms covalent compoundsAnswer: (d)
Q.12
As alkaline earth metals ( except Be) tend to lose their valence electrons readily, they acts as [ Keralla MEE 2002]
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a) Weak oxidising agents
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b) Weak reducing agents
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c)Strong oxidising agents
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d)Bases
Explanation
Alkaline earth metals acts as strong reducing agent, thus appropriate option is bases Answer:(d)
Q.13
Several blocks of magnesium are fixed to the bottom of ship to .. [AIEEE 2003]
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a) Make the ship lighter
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b) Prevent action of water and salt
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c) Prevent puncturing by under-sea rocks
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d) Keep away the hark
Explanation
Answer: (b)
Q.14
Property of the alkaline earth metals that increases with their atomic number is ... [ IIT 1997]
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a)Ionization energy
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b) Solubility of their hydroxides
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c)Solubility of their sulphates
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d)electro negativity
Explanation
Answer: (b)
Q.15
A metal X on heating in nitrogen gas gives Y, Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. Y is .. [ DEC 2000]
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a) Mg(NO3)2
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b) Mg3N2
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c)NH3
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d)MgO
Explanation
3Mg + N2 → Mg3N2Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH2 ↔CuSO4 + 4NH3 → [Cu(NH3)4]SO4 (blue complex)Answer: (b)
Q.16
The number of covalent bonds formed by beryllium is ... [ Manipal PMT 2001]
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a) 2
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b) 3
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c)4
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d)5
Explanation
Be have two valence electrons thus can form only two covalent bonds Answer:(a)
Q.17
30g of Mg and 30g of O2 are reacted and residual mixture contains..
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a) 60 g of Mg only
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b) 40g of MgO and 20g of O2
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c) 45g of MgO and 15g of O2
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d) 50g of MgO and 10g of O2
Explanation
2Mg + O2 → 2MgO Thus 48g of Mg requires 32g of O2 to form 80g of MgO Therefore30g of Mg requires 20g of O2 to form 50g of MgO the residual mixture contains 50g MgO and 10g of O2 Answer: (d)
Q.18
metals belonging to the same group in the periodic table are ..[ MP PMT 1998]
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a)Mg and Na
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b) Mg and Cu
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c)Mg and Ba
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d)Mg and K
Explanation
Answer: (c)
Q.19
the set representing correct order of first ionization potential is ..[ IIT screening test 2001]
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a) K > Na > Li
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b) Be > Mg > Ca
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c)B > C > N
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d)Ge > Si > C
Explanation
On moving from top to bottom in group Ionization potential decreases as the size of the atom increasesAnswer: (b)
Q.20
A solution of MgCl2 in water has pH .. [ MP PMT 2002]
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a) < 7
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b) > 7
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c)7
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d)14.2
Explanation
MgCl2 is salt of strong base and acid Answer:(c)
Q.21
Fire extinguishers contain H2SO4 and ...[AFMC 1980]
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a) NaHCO3 and Na2CO3
0%
b) NaHCO3solution
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c) Na2CO3
0%
d) CaCO3
Explanation
Answer: (a)
Q.22
The first ionization potential of Mg is ..[ CPMT 1997]
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a)Less than Al
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b) More than Al
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c)Equal to Al
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d)Zero
Explanation
First ionization potential of Mg is more than Al as the electron has to be removed from completely filled s-valence shell of MgAnswer: (b)
Q.23
A chloride dissolves appreciably in cold water. When placed on a Pt. wire in Bunsen flame, no distinctive colour is noted. Which cation could be present
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a) Be2+
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b) Ba2+
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c)Pb2+
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d)Ca2+
Explanation
ionization energy of Be is very high, which can not be provided by Bunsen flame and Be2+ ions do not impart colour to the flameAnswer: (a)
Q.24
The substance not likely to contain CaCO3 is ... [ AIEEE 2003]
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a) Calcined gypsum
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b) Sea shells
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c) Dolomite
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d) A marble statue
Explanation
Answer: (a)
Q.25
What is X in the following reaction? MgCl2 + 2H2O → X + 2HCl + H2O
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a)MgO
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b) Mg
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c)Mg(OH)2
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d)Mg(OH)Cl
Explanation
Answer: (a)
Q.26
Chemical A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A....[ AIIMS 1999]
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a) CaCO3
0%
b) CaO
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c)Ca(OH)2
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d)Ca(HCO3)2
Explanation
Ca(OH)2 + Na2CO3 → 2NaOH + CaCO3Answer: (c)
Q.27
As the nuclear charge increases from neon to calcium, the orbital energies...[kerala MEE 2002]
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a)Increases
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b) Increase very rapidly
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c)Increases very slowly
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d)remains constant
Explanation
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p After Neon ( At no 18) next electron enters into 4s orbitals which is lower in energy than 3d orbital Answer:(d)
Q.28
Initial setting of cement is mainly due to .. [ kerala CEE 2003]
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a) Hydration and gel formation
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b) Dehydration and gel formation
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c) Hydration and hydrolysis
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d) Hydration and oxidation
Explanation
Answer: (a)
Q.29
Lebanese process is employed in the manufacture of .. [CPMT 1982]
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a)Baking soda
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b) Washing soda
0%
c)Potash
0%
d)Plaster of paris
Explanation
Answer: (c)
Q.30
The metallic lustre exhibited by sodium is explained by .. [ IIT 1987]
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a) Diffusion of sodium ions
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b) Oscillation of loose electrons
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c)Excitation of free protons
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d)Existence of body centered cubic lattice
Explanation
Answer: (b)
0 h : 0 m : 1 s
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