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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 2
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Q.1
The wire of flash bulb is made of ..[CPMT 1988]
0%
a) Mg
0%
b) Cu
0%
c)Ba
0%
d)Ag
Explanation
Answer:(a)
Q.2
A firework gives out green colour light. It contains a slat of ..[ AFMC 1989]
0%
a) Na
0%
b) K
0%
c) Ba
0%
d) Ca
Explanation
Answer: (c)
Q.3
Which of the following are arranged in increasing order of solubility?
0%
a)CaCO3 < KHCO3 < NaHCO3
0%
b) NaHCO3 < KHCO3 < CaCO3
0%
c)KHCO3 < NaHCO3 < CaCO3
0%
d)CaCO3 < NaHCO3 < KHCO3
Explanation
Lesser the lattice energy more is solubilityAnswer: (d)
Q.4
Which of the following does not liberate O2 in Bunsen burner ..[AFMC 1988]
0%
a) MgO
0%
b) NaNO3
0%
c)Pb3O4
0%
d)KClO3
Explanation
Except MgO all other gives Oxygen 2Pb3O4 → 6PbO + O2 2NaNO3 → 2naNO2 + O2 2KClO3 → 2KCl + 3O2Answer: (a)
Q.5
Which of the following is different from the other three oxides? [ AFMC 1989]
0%
a) MgO
0%
b) SnO
0%
c)ZnO
0%
d)Cr2O3
Explanation
MgO is basic while other three are amphoteric in nature Answer:(a)
Q.6
Mixture of MgCl2 and MgO is called [ DPMT 1982]
0%
a) Portland cement
0%
b) Sorrel's cement
0%
c) Double salt
0%
d) None
Explanation
Answer: (b)
Q.7
Setting of Plaster of Paris involves [ MP PMT 1985]
0%
a)Oxidation with atmospheric oxygen
0%
b) Combination with atmospheric CO2
0%
c)Hydration to yield another hydrate
0%
d)Dehydration
Explanation
CaSO4 . ½ H2O → CaSO4 . 2H2OAnswer: (c)
Q.8
Out of the following elements which one do you expect to be most reactive chemically [ CPMT 1983]
0%
a) Be
0%
b) Ca
0%
c)Ba
0%
d)Sr
Explanation
Ba have lower electrode potential thus more reactiveAnswer: (c)
Q.9
Which of the following are arranged in increasing order of solubility? [ AFMC 1987]
0%
a) CaCO3 < KHCO3 < NaHCO3
0%
b) NaHCO3 < KHCO3 < CaCO3
0%
c)KHCO3 < NaHCO3 < CaCO3
0%
d)CaCO3 < NaHCO3 < KHCO3
Explanation
Answer:(d)
Q.10
Which of the following sulphates has highest solubility in water? [ AFMC 1990]
0%
a) BaSO4
0%
b) CaSO4
0%
c) BeSO4
0%
d) MgSO4
Explanation
Answer: (c)
Q.11
Setting of cement is an ..[DPMT 1984]
0%
a)Exothermic reaction
0%
b) Endothermic reaction
0%
c)Neither exothermic nor endothermic
0%
d)None
Explanation
Answer: (a)
Q.12
Oxone is ...[Manipal PMT 2001]
0%
a) CaO
0%
b) N2O
0%
c) Na2O2
0%
d) NaBO3
Explanation
Answer: (c)
Q.13
The alkaline earth metals Ba, Sr, Ca, and Mg may be arranged in the order of their decreasing first ionization potential as .. [ CPMT 1990]
0%
a)Mg, Ca, Sr, Ba
0%
b) Ca, Sr, Ba,Mg
0%
c)Sr, Ba, Mg, Ca
0%
d)Ba, Mg, Ca, Sr
Explanation
As the size increases ionization potential decreasesAnswer: (a)
Q.14
the right order of the solubility of sulphates of alkaline earth metals in water is .. [ MPCEE 1993]
0%
a) Be > Ca > Mg > Ba > Sr
0%
b) Mg > Be > Ba > Ca > Sr
0%
c)Be > Mg > Ca > Sr > Ba
0%
d)Mg > Ca > Ba > Be > Sr
Explanation
As the size of cation increases, their hydration energies decreases more rapidly than their lattice energies. Consequently the volatilities of sulphide decreases down the groupAnswer: (c)
Q.15
A drying agent which absorbs carbon dioxide and reacts violently with water is .. [ BHU 1994]
0%
a)Sodium carbonate
0%
b) Alcohol
0%
c)Conc. sulphuric acid
0%
d)Calcium oxide
Explanation
Answer:(d)
Q.16
Which of the alkaline earth metals is the strongest reducing agent? [ MP PMT 1995]
0%
a) Ca
0%
b) Sr
0%
c) Ba
0%
d) Mg
Explanation
Ba have lower ionization energy thus stronger reducing agent Answer: (c)
Q.17
Which of the following is true for magnesium? [ Pb CET 1990]
0%
a)It is more electronegative than sodium
0%
b) It is manufactured by electrolysis of aqueous magnesium chloride
0%
c)It is strong reducing agent
0%
d)It resembles, in chemical properties, with its diagonally placed element Boron in III group of the Periodic table
Explanation
Answer: (c)
Q.18
An atom with atomic number 20 is more likely to combine chemically with the atom whose atomic number is ..[CBSE PMT 1993]
0%
a) 11
0%
b) 14
0%
c)16
0%
d)10
Explanation
Z=20 have 2 electrons in outer most orbit , while Z=16 have six electrons in outer orbit thus Z=16 will accept two electrons from Z=20 to form chemical bondAnswer: (c)
Q.19
Which of the following metal ion plays important role in muscle contraction? [ CBSE PMT 1994]
0%
a)K+
0%
b) Na+
0%
c)Mg2+
0%
d)Ca2+
Explanation
Answer:(d)
Q.20
Identify the correct statement? [ CBSE PMT 1995]
0%
a) Gypsum contains a lower percentage of calcium than plaster of Paris
0%
b) Gypsum is obtained by heating plaster of Paris
0%
c) Plaster of Paris can be obtained by hydration of gypsum
0%
d) Plaster of Paris is obtain by partial oxidation of gypsum
Explanation
Answer: (a)
Q.21
Which of the following has correct increasing basic strength? [ CPMT 1992]
0%
a)MgO < BeO < CaO < BaO
0%
b) BeO < MgO < CaO < BaO
0%
c)BaO < CaO < MgO < BeO
0%
d)CaO < BaO < BeO < MgO
Explanation
Basic character increases down the groupAnswer: (b)
Q.22
Melting point is lower for .. [ AFMC 1994]
0%
a) Be
0%
b) Mg
0%
c)Ca
0%
d)Sr
Explanation
Answer: (b)
Q.23
Which of the following statement is false? ..[CBSE PMT 1994]
0%
a) Strontium decomposes water readily than beryllium
0%
b) Barium carbonate melts at higher temperature than calcium carbonate
0%
c)Barium hydroxide is more soluble in water than magnesium hydroxide
0%
d)Beryllium hydroxide is more basic than barium hydroxide
Explanation
Beryllium hydroxide although amphoteric, is how ever less basic than barium hydroxide Answer:(d)
Q.24
A metal is burnt in air and the ash on moistening smells of NHthe metal is ..[KCET 1996]
0%
a) Na
0%
b) Fe
0%
c) Mg
0%
d) Al
Explanation
Mg burns in air to form Mg3N2 which then reacts with H2O to form NH3 Answer: (c)
Q.25
Which of the following compound of cement sets at the slowest rate? [ CPMT 1992]
0%
a)Dicalcium silicate
0%
b) Tricalcium silicate
0%
c)Tricalcium aluminate
0%
d)Tetracalcium aluminoferrite
Explanation
Dicalcium silicate 2CaO.SiO2 have higher SiO2 so it has slow setting rate, Answer: (a)
Q.26
All the following substances reacts with water. the pair that gives the same gaseous product is .. [ CBSE PMT 1994]
0%
a) K and KO2
0%
b) Na and Na2O2
0%
c)Ca and CaH2
0%
d)Ba and BaO2
Explanation
Na and Ba gives Hydroxide + H2 Na2O2 and BaO2 gives hydroxide and H2O2While K gives KOH+ H2 and KO2 gives O2 and H2O2 Ca + 2H2O → Ca(OH)2 + H2 CaH2 + 2H2O → Ca(OH)2 + 2H2 Answer: (c)
Q.27
Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [ Pb CET 1995]
0%
a) Mg
0%
b) Al
0%
c)Fe
0%
d)Cu
Explanation
Answer:(a)
Q.28
The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct orderK2CO3(I), MgCO3(II), CaCO3(III), BeCO3(IV)
0%
a) I < II < III < IV
0%
b) IV < II < III < I
0%
c) IV < II < I < III
0%
d) II < IV < III < I
Explanation
Stability of carbonates increases down the group as the basic character increases Answer: (b)
Q.29
Which of the following has highest electrode potential? [ CPMT 1990]
0%
a)Be
0%
b) Mg
0%
c)Ca
0%
d)Ba
Explanation
Answer: (a)
Q.30
The most electropositive amongst the alkaline earth metal is ..[MP PMT 1993]
0%
a) Beryllium
0%
b) Magnesium
0%
c)Calcium
0%
d)Barium
Explanation
Barium have lowest ionization energy hence highest electropositive characterAnswer: (d)
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