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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 1
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Q.1
The compound insoluble in acetic acid is ..
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a) Calcium oxide
0%
b) Calcium carbonate
0%
c)Calcium oxalate
0%
d)Calcium hydroxide
Explanation
Except option 'c' all reacts with acetic acidAnswer: (c)
Q.2
Portland cement is manufactured by using [ CPMT 1987]
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a) Lime stone, clay and sand
0%
b) Limestone, gypsum and sand
0%
c)Limestone, gypsum and alumia
0%
d)Limestone, clay and gypsum
Explanation
Answer:(d)
Q.3
Which of the following statements is correct for alkaline earth metals? ..[NCERT 1990]
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a) They are diatomic and forms ions of M2-
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b) They are highly electronegative elements
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c) They are monoatomic and form ions of type M+
0%
d) They are monoatomic and form ions of the type M2+
Explanation
Answer: (d)
Q.4
The first ionization energies of alkine earth metals are higher than those of the alkali metals. This is because... [ MP CEE 1996]
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a) There is an increase in the nuclear change of the alkaline earth metals
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b) There is a decrease in the nuclear charge of the alkaline earth metals
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c) There is no change in the nuclear charge
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d) None of the above
Explanation
Answer: (a)
Q.5
Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give : .... [NEET 2020]
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a)Tert. butyl alcohol
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b) Isobutyl alcohol
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c) Isopropyl alcohol
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d) Sec. butyl alcohol
Explanation
CaC2 + N2 → CaCN2 at 1100° CAnswer: (a)
Q.6
HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallise(s)? [ NEET 2020]
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a) Only MgCl2
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b) NaCl, MgCl2 and CaCl2
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c) Both MgCl2 and CaCl2
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d) Only NaCl
Explanation
Co2+ Answer: (d)
Q.7
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is : [NEET 2019]
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a) Be
0%
b) Mg
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c) Ca
0%
d) Sr
Explanation
Answer:(b)
Q.8
Which of the following is an amphoteric hydroxide? [NEET 2019]
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a) Sr(OH)2
0%
b) Ca(OH)2
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c) Mg(OH)2
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d) Be(OH)2
Explanation
Answer: (d)
Q.9
Which of the following oxides is most acidic in nature ? [NEET 2018]
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a) BaO
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b) BeO
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c) MgO
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d) CaO
Explanation
Answer: (b)
Q.10
Among CaH2, BeH2, BaH2, the order of ionic character is [NEET 2018]
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a) BeH2 < BaH2 < CaH2
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b) CaH2 < BeH2 < BaH2
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c) BeH2 < CaH2 < BaH2
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d) BaH2 < BeH2 < CaH2
Explanation
Answer: (c)
Q.11
The product obtained on fusion of BaSO4 and Na2CO3 is: [ AFMC 2005]
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a) BaCO3
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b) BaO
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c)Ba(OH)2
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d)BaHSO4
Explanation
BaSO4 + Na2CO3 → BaCO3 + Na2 SO4 Answer:(a)
Q.12
Which of the following is used to produce smoke screens? [ AFMC 2005]
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a) Calcium phosphide
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b) zinc sulphide
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c) sodium carbonate
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d) zinc phosphide
Explanation
Answer: (a)
Q.13
Li has the maximum value of ionization potential among the alkali metals i.e. lithium has the minimum tendency to ionize to give Li+ ion. Thus, in aq. solution lithium is .. [ AFMC 2011]
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a)strong reducing agent
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b) Poorest reduction agent
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c)Strongest Oxidizing agent
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d)Poorest oxidizing agent
Explanation
The ionisation potential value of lithium is maximum among alkali metals i.e. its tendency to ionize to give Li+ ions should be the minimum i.e. Li should be the poorest reducing agent. But lithium is the strongest reducing agent in aq.solution due to largest value of hydration energy.Answer: (a)
Q.14
Among the alkali metals, cesium is the most reactive because .. [ AFMC 2008]
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a) its incomplete shell is nearest to the nucleus
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b) it has a single electron in the valance shell
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c)it is the heaviest alkali metal
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d)the outermost electron is more loosely bound than the outermost electron of other alkali metals.
Explanation
Because of large size electron is more loosely bonded. hence it is most reactive in alkali metalsAnswer: (d)
Q.15
Calcium Carbide reacts with water to produce ..[ AFMC 2006]
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a) ethane
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b) methane
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c)ethylene
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d)acetylene
Explanation
Answer:(d)
Q.16
Glauber salt is
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a) MgSO4.7H2O.
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b) CuSO4.5H2O.
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c) FeSO4.7H2O.
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d) Na2SO4.10H2O.
Explanation
Answer: (d)
Q.17
A major constituent of Portland cement ( except lime ) is [ CPMT 1980]
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a)Silica
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b) Aluminia
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c)Iron oxide
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d)Magnesia
Explanation
Answer: (a)
Q.18
Calcium cyanamide on treatment with steam under pressure gives NH3 and .. [CPMT 1986]
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a) Calcium carbonate
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b) Calcium hydroxide
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c)Calcium oxide
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d)Calcium bicarbonate
Explanation
CaNCN + 3H2O → CaCO3 + 2NH3Answer: (a)
Q.19
Which of the following is least soluble in water? [ Pb. CET 1988]
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a) BeSO4
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b) BaSO4
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c)CaSO4
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d)SrSO4
Explanation
As per NCERT book "BeSO4, and MgSO4 are readily soluble in water; the solubility decreases from CaSO4 to BaSO4. The greater hydration enthalpies of Be2+ and Mg2+ ions overcome the lattice enthalpy factor and therefore their sulphates are soluble in water." Answer:(b)
Q.20
Dolomite has the composition ..[Pb CET 1989]
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a) Kcl . MgCl2 . 6H2O
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b) Na3AlF6
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c) CaCO3 . MgCO3
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d) CaCl2 . MgCl2 . 6H2O
Explanation
Answer: (c)
Q.21
Which of the following metal carbonates decomposes on heating? [ MLNR 1985]
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a)MgCO3
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b) Na2CO3
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c)K2CO3
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d)Rb2CO3
Explanation
Answer: (a)
Q.22
Magnesium keeps burning in .. [ AFMC 1987]
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a) N2
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b) CO2
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c)NO2
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d)N2 as well as CO2
Explanation
When Mg is heated 3Mg + N2 → Mg3N2 2Mg + CO2 → MgO + CAnswer: (d)
Q.23
Drying agent which reacts with CO2 and removes water vapour is ..[AFMC 1988]
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a) CaO
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b) CaCl2
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c)CaCO3
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d)Ca(NO3)2
Explanation
Answer:(a)
Q.24
Thermal stability of alkaline earth metal carbonates decreases in order ..[ NCERT 1983]
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a) BaCO3 > SrCO3 > CaCO3 > MgCO3
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b) BaCO3 > SrCO3 > MgCO3 > CaCO3
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c) CaCO3 > SrCO3 > MGCO3 > BaCO3
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d) MgCO3 > CaCO3 > SrCO3 > BaCO3
Explanation
Thermal stability decreases as the basic character of the metal hydroxide decreases Answer: (a)
Q.25
the hydration energy of Mg2+ ions is larger than that of ..
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a)Al3+
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b) Na+
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c)Be2+
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d)Mg3+
Explanation
Na+ ion has larger size than Mg2+ ion and hence hydration energy of Mg2+ is larger than that of Na+Answer: (b)
Q.26
of the following the commonly used in a laboratory desiccators is ..[MP PMT 1987]
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a) Anhydrous Na2CO3
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b) Anhydrous CaCl2
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c)Dry NaCl
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d)None of the above
Explanation
Answer: (b)
Q.27
A firework gives out crimson colour light. It contains salt of ..[AFMC 1989]
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a) Ca
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b) Na
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c)Sr
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d)Ba
Explanation
Answer:(c)
Q.28
Plaster of Paris is hardens by ... [ CPMT 1989]
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a) Giving off CO2
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b) Changing into CaCO3
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c) Combining with water
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d) Giving out water
Explanation
Answer: (c)
Q.29
Which one of the alkaline earth metals shows some anomalous behavior and has the same electro negativity as aluminum? [ AIIMS 1985]
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c)Ca
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d)Be
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a)Ba
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b) Sr
Explanation
Answer: (d)
Q.30
Formula for calcium cyanamide is .. [ Roorkee 1998]
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a) Ca(CN)2
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b) CaC2N
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c)CaNCN
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d)CaCHNH2
Explanation
Answer: (c)
0 h : 0 m : 1 s
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