The first ionization potentials (eV) of Be and B respectively are ..[ CBSE PMT 1998]
17%
a)8.29, 9.32
0%
b) 9.32, 9.32
17%
c)8.29, 8.29
67%
d)9.23, 8.29
Q.3.
Plaster of paris is used .. [ CPMT 2000]
83%
a) As a plaster for walls
17%
b) In dentistry and surgery
0%
c)In metallurgical process
0%
d)As drying agent
Q.4.
The reaction of slaked lime with Cl2 gas gives.. [ kerala MEE 2000]
29%
a)only Ca(OCl)2
29%
b) only CaCl2
43%
c)Mixture of ca(OCl)2, Ca(OH)2, CaCl2 and H2O
0%
d)baryta water
Q.5.
Which of the following ion forms a hydroxide highly soluble in water? [ DPMT 1979]
17%
a) Ni2+
50%
b) K+
17%
c) Zn2+
17%
d) Al3+
Q.6.
One which is not dissolved by dilute hydrochloric acid is .. [ P. CET 1997]
29%
a)ZnS
14%
b) MnS
0%
c)BaCO3
57%
d)BaSO4
Q.7.
Which of the following is incorrect
17%
a) Mg burns in air releasing dazzling light rich in UV rays
17%
b) CaCl2 . 6H2O when mixed with ice gives freezing mixture
50%
c)Mg cannot form complex
17%
d)Be can form complexes due to its very small size
Q.8.
On heating quick lime with coke in an electric furnace, we get ..[AIIMS 2001]
29%
a) Ca and CO2
14%
b) CaCO3
29%
c)CaO
29%
d)CaC2
Q.9.
In curing cement plaster, water is sprinkled from time to time. This helps in .... [ AIEEE2003]
83%
a) Developing interlocking needle like crystals of hydrated silicates
17%
b) Hydrated sand gravel mixed with cement
0%
c) Converting sand into silicic acid
0%
d) keeping it cool
Q.10.
the correct order of increasing ionic character is ..[AFMC 1998]
83%
a)BeCl2 < MgCl2 < CaCl2 < BaCl2
0%
b) BeCl2 < MgCl2 < BaCl2 < CaCl2
0%
c)BeCl2 < BaCl2 < MgCl2 < CaCl2
17%
d)BaCl2 < CaCl2 < MgCl2 < BeCl2
Q.11.
Among the alkaline earth metals, the element forming predominantly covalent compound is ..[MP CEE 1999]
18%
a) Ba
0%
b) Sr
36%
c)Ca
45%
d)Be
Q.12.
As alkaline earth metals ( except Be) tend to lose their valence electrons readily, they acts as [ Keralla MEE 2002]
0%
a) Weak oxidising agents
22%
b) Weak reducing agents
44%
c)Strong oxidising agents
33%
d)Bases
Q.13.
Several blocks of magnesium are fixed to the bottom of ship to .. [AIEEE 2003]
14%
a) Make the ship lighter
43%
b) Prevent action of water and salt
0%
c) Prevent puncturing by under-sea rocks
43%
d) Keep away the hark
Q.14.
Property of the alkaline earth metals that increases with their atomic number is ... [ IIT 1997]
17%
a)Ionization energy
67%
b) Solubility of their hydroxides
17%
c)Solubility of their sulphates
0%
d)electro negativity
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]
14%
a) Mg(NO3)2
57%
b) Mg3N2
29%
c)NH3
0%
d)MgO
Q.16.
The number of covalent bonds formed by beryllium is ... [ Manipal PMT 2001]
67%
a) 2
0%
b) 3
33%
c)4
0%
d)5
Q.17.
30g of Mg and 30g of O2 are reacted and residual mixture contains..
0%
a) 60 g of Mg only
33%
b) 40g of MgO and 20g of O2
17%
c) 45g of MgO and 15g of O2
50%
d) 50g of MgO and 10g of O2
Q.18.
metals belonging to the same group in the periodic table are ..[ MP PMT 1998]
0%
a)Mg and Na
0%
b) Mg and Cu
83%
c)Mg and Ba
17%
d)Mg and K
Q.19.
the set representing correct order of first ionization potential is ..[ IIT screening test 2001]
17%
a) K > Na > Li
67%
b) Be > Mg > Ca
0%
c)B > C > N
17%
d)Ge > Si > C
Q.20.
A solution of MgCl2 in water has pH .. [ MP PMT 2002]
50%
a) < 7
12%
b) > 7
25%
c)7
12%
d)14.2
Q.21.
Fire extinguishers contain H2SO4 and ...[AFMC 1980]
50%
a) NaHCO3 and Na2CO3
12%
b) NaHCO3solution
25%
c) Na2CO3
12%
d) CaCO3
Q.22.
The first ionization potential of Mg is ..[ CPMT 1997]
33%
a)Less than Al
50%
b) More than Al
17%
c)Equal to Al
0%
d)Zero
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
67%
a) Be2+
0%
b) Ba2+
33%
c)Pb2+
0%
d)Ca2+
Q.24.
The substance not likely to contain CaCO3 is ... [ AIEEE 2003]
43%
a) Calcined gypsum
14%
b) Sea shells
29%
c) Dolomite
14%
d) A marble statue
Q.25.
What is X in the following reaction? MgCl2 + 2H2O → X + 2HCl + H2O
50%
a)MgO
0%
b) Mg
50%
c)Mg(OH)2
0%
d)Mg(OH)Cl
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]
29%
a) CaCO3
0%
b) CaO
57%
c)Ca(OH)2
14%
d)Ca(HCO3)2
Q.27.
As the nuclear charge increases from neon to calcium, the orbital energies...[kerala MEE 2002]
27%
a)Increases
27%
b) Increase very rapidly
36%
c)Increases very slowly
9%
d)remains constant
Q.28.
Initial setting of cement is mainly due to .. [ kerala CEE 2003]
67%
a) Hydration and gel formation
0%
b) Dehydration and gel formation
0%
c) Hydration and hydrolysis
33%
d) Hydration and oxidation
Q.29.
Lebanese process is employed in the manufacture of .. [CPMT 1982]
29%
a)Baking soda
0%
b) Washing soda
57%
c)Potash
14%
d)Plaster of paris
Q.30.
The metallic lustre exhibited by sodium is explained by .. [ IIT 1987]
33%
a) Diffusion of sodium ions
33%
b) Oscillation of loose electrons
17%
c)Excitation of free protons
17%
d)Existence of body centered cubic lattice
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