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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 5
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Q.1
Which of the following statement is false for alkali metals? [ MLNR 1994]
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a)Lithium is strongest reducing agent
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b) Sodium is amphoteric in nature
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c)Li+ is exceptionally small
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d)Alkali metals give blue solution in liquid ammonia
Explanation
All alkali metals are strong baseAnswer: (b)
Q.2
Which of the following oxides is formed when potassium metal is burnt in excess air? [ Pb. CET 1990]
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a) K2O
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b) KO
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c)KO2
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d)K2O2
Explanation
Potassium forms super oxide KO2 Answer:(c)
Q.3
Salt used for performing bead test in qualitative inorganic analysis is .. [MLNR 1991]
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a) K2SO4. Al2(SO4 .6H2O
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b) FeSO4 . (NH4)2SO4 .6H2O
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c) Na(NH4)HPO4 .4H2O
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d) CuSO4 . 5H2O
Explanation
Answer: (c)
Q.4
Sodium carbonate reacts with SO2 in aqueous medium to give .. [ MP PMT 1985]
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a)NaHSO3
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b) Na2S2O3
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c)NaHSO4
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d)Na2SO4
Explanation
Na2CO3 + 2SO2 + H2O → 2NaHSO3 + CO2Answer: (a)
Q.5
Sodium metal cannot be stored under.. [ CPMT 1988]
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a) Benzene
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b) Kerosene oil
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c)Alcohol
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d)Toluene
Explanation
Sodium reacts with alcoholAnswer: (c)
Q.6
The properties of lithium are similar to those of Mg. This is because ..[NCERT 1990]
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a) Both have nearly same size
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b) The ratio of their charge to size is nearly same
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c)Both have similar electron configuration
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d)Both are found together in nature
Explanation
Answer:(b)
Q.7
The alkali metal that reacts with nitrogen directly to form nitride is ... [Roorkee 1992]
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a) Li
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b) Na
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c) K
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d) Rb
Explanation
Li reacts with nitrogen directly to form Li3N Answer: (a)
Q.8
Which of the following imparts violet coloration to the non-luminous flame of Bunsen burner? [ CPMT 1985]
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a)NaCl
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b) BaCl2
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c)CaCl2
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d)KCl
Explanation
Answer: (d)
Q.9
Which of the following atoms will have the smallest size? [ CBSE PMT 1989]
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a) Mg
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b) Na
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c)Be
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d)Li
Explanation
With in the period size decreases from left to rightAnswer: (c)
Q.10
Potassium metal is commercially prepared by the reduction of molten KCl with metallic sodium at 850°C. This method is based upon the following principle. ..[Pb CET 1990]
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a) Sodium is more reactive than potassium at this temperature
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b) Potassium being more volatile distills off thus shifting the reaction forward
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c)Sodium prefers to bind to chloride ions in preference to potassium ions
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d)Potassium and sodium form an alloy at this temperature
Explanation
Answer:(c)
Q.11
Which of the following does not illustrate the anomalous properties of Li? [ MP CET 1993]
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a) The m.p. and b.p. of Li are comparatively high
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b) Li forms a nitride unlike group 1 metals
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c) Li is much softer than the other I group metals
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d) Li+ and its compounds are more heavily hydrated than those of the rest of the group
Explanation
Li has smaller size and forms strong metallic bonds thus it is harder than rest of the elements in the group Answer: (c)
Q.12
The pair of compounds which cannot exist together in solution is ... [ IIT 1986]
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a)NaHCO3 and NaOH
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b) NaHCO3 and H2O
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c)NaHCO3 and Na2CO3
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d)Na2CO3 and NaOH
Explanation
NaHCO3 is a acidic salt , it reacts with NaOH to form, Na2CO3 and H2OAnswer: (a)
Q.13
Which of the following alkali metal hydroxides is the strongest base? [ PbCET 1990]
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a) LiOH
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b) NaOH
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c)KOH
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d)CsOH
Explanation
Lower the ionization energy more is basic character. Answer: (d)
Q.14
Microcosmic salt is .. [CPMT 1991]
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a) Na2HPO4 . 2H2O
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b) (NH4)2HPO4
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c)Na(NH4)HPO4 .4H2O
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d)None of above
Explanation
Answer:(c)
Q.15
In the preparation of sodium carbonate (Na2CO3) which of the following is used? ..[AFMC 1992]
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a) Slaked lime
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b) Quick lime
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c) Lime stone
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d) Sodium hydroxide
Explanation
Lime stone is used for production of CO2 Answer: (c)
Q.16
Which is manufactured by electrolysis of fused NaCl? ..[CPMT 1983]
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a)NaOH
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b) Na
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c)NaClO
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d)NaClO3
Explanation
Answer: (b)
Q.17
When CO2 is bubbled into aqueous solution of Na2CO3 the following is formed [MP PMT 1986]
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a) NaOH
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b) NaHCO3
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c)H2O
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d)OH-
Explanation
Na2CO3 + CO2 + H2O → 2NaHCO3Answer: (b)
Q.18
Which of the following compounds has the lowest anion to cation size ratio? [ NCERT 1990]
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a) LiF
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b) NaF
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c)CsI
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d)CsF
Explanation
Answer:(d)
Q.19
Sodium conducts electricity because .. [Pb CET1991]
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a) It is a soft alkali metal
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b) It has only one electron in the outermost orbit
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c) It has mobile electrons
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d) It gives hydrogen with water
Explanation
Answer: (c)
Q.20
Molecular formula of Glauber's salt is .. [ IIT 1985]
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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.21
Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of .. [Pb CET 1989]
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a) Easy diffusion of Li+ ions
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b) Lower ability of Li+ ions to polarize water molecules
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c)Lowest charge to radius ratio
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d)Higher degree of hydration of Li+ ions
Explanation
Answer: (d)
Q.22
The gas evolved on heating Na2CO3 is ..[CPMT 1990]
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a)CO2
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b) CO
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c)Water gas
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d)No gas
Explanation
If anhydrous sodium carbonate is heated, loss in weight — due to dissociation and volatilization — begins at 400° C (752° F). Carbon dioxide is evolved as indicated by the reaction equation. Na2CO3 → Na2O + CO2 Answer:(a)
Q.23
The correct sequence of the alkali metals in the group is ... [ AFMC 1992]
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a) Fr, Na, K, Rb, Cs, Li
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b) Li, Na, K, Rb, Cs, Fr
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c) Na, K, Rb, Cs, Fr, Li
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d) Rb, Cs, Li, Na, K
Explanation
Answer: (b)
Q.24
Nitrogen can not be prepared by heating .. [ IIT 1985]
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a)KNO3
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b) Pb(NO3)2
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c)Cu(NO3)2
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d)AgNO3
Explanation
Only nitrates of heavy metals and lithium decompose on heating to produce NO2Answer: (a)
Q.25
The formula of nitre is ... [CPMT 1989]
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a) KNO3
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b) NaNO2
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c)NaCl
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d)Na2CO3
Explanation
Answer: (a)
Q.26
NaCl crystal consists of .. [ Vellore PMT 1991]
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a) NaCl molecules
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b) Na and Cl atoms
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c)Na+ and Cl- ions
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d)Na- and Cl+ ions
Explanation
Answer:(c)
Q.27
The chloride of an element A gives a neutral solution in water. In the periodic table, the element A belongs to ...[ AIIMS 1992]
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a) First group
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b) Third group
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c) Fifth group
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d) First transition series
Explanation
Answer: (a)
Q.28
Which of the following is radioactive? [ BHU 1992]
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a)Na 23
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b) K39
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c)K40
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d)Ca40
Explanation
Answer: (c)
Q.29
Compared to alkali earth metals, the alkali metals exhibit... [CBSE PMT 1990]
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a) Smaller ionic radii
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b) Highest boiling points
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c)Greater hardness
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d)Lower ionization energies
Explanation
Answer: (d)
Q.30
Which of the following is more basic ..[Vellore PMT 1991]
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a) Na2O
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b) BaO
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c)Al2O3
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d)As2O3
Explanation
Alkali metals are most basic followed by alkaline earth metals Answer:(a)
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