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NEET Chemistry MCQ
S - Block Elements Mcq Neet Chemistry
Quiz 6
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Q.1
Which of the following has minimum value of cation/anion ratio ..[CBSE PMT 1993]
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a) NaCl
0%
b) KCl
0%
c) MgCl2
0%
d) CaF2
Explanation
Down the group size of cation increases while in period size decreases thus Mg2+ is smallest. While Cl- is bibber than F-. Thus MgCl2 is correct option Answer: (c)
Q.2
Chile salt petre is ..[CPMT 1984]
0%
a)NaNO3
0%
b) Na2SO4
0%
c)NKO3
0%
d)Na2S2O3
Explanation
Answer: (a)
Q.3
n aqueous solution of sodium sulphate is electrolysed using inert electrodes. the products at the cathode and anode are respectively
0%
a) H2, O2
0%
b) O2, H2
0%
c)O2, Na
0%
d)O2, SO2
Explanation
Since the solution is dilute and electrodes are neutral, electrolysis of water will take placeAnswer: (a)
Q.4
Which of the following has the highest solubility product?
0%
a) KOH
0%
b) CsOH
0%
c)LiOH
0%
d)RbOH
Explanation
CsOH have highest solubility thus higher solubility product Answer:(b)
Q.5
Crude common salt is hygroscopic because of presence of impurities of ...[SCRA 1991]
0%
a) CaSO4 and MgSO4
0%
b) CaCl2 and MgCl2
0%
c) CaBr2 and MgBr2
0%
d) Ca(HCO3)2 and Mg(HCO3)2
Explanation
Answer: (b)
Q.6
Causticisation process is used for the preparation of .. [CPMT 1985]
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a)Caustic soda
0%
b) Caustic potash
0%
c)Baryata solution
0%
d)Slaked lime
Explanation
Na2CO3 + Ca(OH)2 → CaCO3↓ + 2NaOH (Caustic soda)Answer: (a)
Q.7
Which one of the following properties of alkali metals increases in magnitude as the atomic number rises [ CBSE PMT 1989]
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a) Ionic radius
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b) Melting point
0%
c)Electronegativity
0%
d)First ionization energy
Explanation
Answer: (a)
Q.8
Washing soda has formula .. [CBSE PMT 1990]
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a) Na2CO3 .7H2O
0%
b) Na2CO3 .10H2O
0%
c)Na2CO3.3H2O
0%
d)Na2CO3
Explanation
Answer:(b)
Q.9
Which of the following has lowest thermal stability? [ CPMT 1988]
0%
a) Li2CO3
0%
b) Na2CO3
0%
c) K2CO3
0%
d) Rb2CO3
Explanation
Weaker base, less stable is its carbonate. Since LiOH is weakest base therefore Li2CO3 Answer: (a)
Q.10
Which compound show the highest lattice energy? [ CBSE PMT 1993]
0%
a)RbF
0%
b) CsF
0%
c)NaF
0%
d)KF
Explanation
With the same anion, smaller the size of the cation higher is the lattice energyAnswer: (c)
Q.11
Which of the following compounds is used in gunpowder? [ Rohatak PMT 1994]
0%
a) NaNO3
0%
b) KNO3
0%
c)LiNO3
0%
d)None
Explanation
Answer: (b)
Q.12
Identify the correct statement.. [Pb PMT 1998]
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a) Elemental sodium can be prepared and isolated by electrolysis of aqueous solution of NaCl
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b)elemental Na is a strong oxidising agent
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c)Elemental Na is insoluble in NH3
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d)Elemental Na is easily oxidised
Explanation
Answer:(d)
Q.13
A deliquescent white crystalline hydroxide X reacts with a nitrate Y to form another hydroxide which decomposes to give a insoluble brown layer of its oxide. X is a powerful cattery and breaks down the proteins of skin flesh to a pasty mass. X and Y are ... [ Roorkee 2000]
0%
a) NaOH, AgNO3
0%
b) NaOH, Zn(NO3)2
0%
c) NaOH, Al(NO3)3
0%
d) Ca(OH)2, HgNO3
Explanation
NaOH + AgNO3 → AgOH + NaNO3 AgOH is unstable decomposes 2AgOH → Ag2O + H2O Ag2O is Brown in colour NaOH is powerful cattery and breaks down the skin protein to pasty mass Answer: (a)
Q.14
Strongest bond is between ..[CBSE PMT 1993]
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a)CsF
0%
b) NaCl
0%
c)Both (a) and (b)
0%
d)None of the above
Explanation
According to Fajan rule, ionic character increases with increase in size of the cation and decreases in size of the anion. Thus CsF has higher ionic character than NaCl and bond in CsF is stronger than NaClAnswer: (a)
Q.15
With increase in atomic weight melting points of the alkali metals... [MP PMT 1995]
0%
a) Increases
0%
b) Decreases
0%
c)Remains constant
0%
d)Do not show definite trend
Explanation
In alkali metals metallic bonding become weak thus melting point decreasesAnswer: (b)
Q.16
Anhydrous mixture of KF and HF contains which type of ions? [ JIPMER 2000]
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a) K+, H+, F-
0%
b) (KF)+ (HF)-
0%
c)KH+, F-
0%
d)K+, HF2-
Explanation
KF + HF → K+ [HF2]-. Answer:(d)
Q.17
When NaOH is made, the gas released at the cathode is ..[CPMT 1996]
0%
a) Cl2
0%
b) H2
0%
c)O2
0%
d)H2O
Explanation
At anode chlorine is liberatedAnswer: (b)
Q.18
Which of the following has the highest melting point? [ DPMT 1998]
0%
a) NaCl
0%
b) NaF
0%
c)NaBr
0%
d)NaI
Explanation
Due to larger lattice enthalpy of NaF higher melting point Answer:(b)
Q.19
KO2 (potassium super oxide) is used in oxygen cylinders in space and submarine because ..[AIEEE 2002]
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a) Absorbs CO2 and O2 contents
0%
b) Eliminates moisture
0%
c) Absorbs CO2
0%
d) Produce Ozone
Explanation
Answer: (a)
Q.20
Fires, that result from the combustion of alkali metals can be extinguished by ..[KCET 1994]
0%
a)CCl4
0%
b) Sand
0%
c)Water
0%
d)Kerosene
Explanation
CCl4 is low boiling point, highly non inflammable heavy liquid. It vapour surrounded the fire thereby cutting of air supply. As a result, fire is extinguished.Answer: (a)
Q.21
Alkalimetals are generally extracted by ... [ Pb CET 1997]
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a) Reduction methods
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b) Double decomposition methods
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c)Displacement method
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d)Electrolytic methods
Explanation
Answer: (d)
Q.22
Cs+ ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have ..[Haryana CEET 1999]
0%
a) High energy
0%
b) Low energy
0%
c)Low wavelength
0%
d)None of these
Explanation
Answer:(a)
Q.23
In electrolysis of NaCl when Pt electrode is taken than H2 is liberated at cathode while with Hg cathode it forms sodium amalgam. The reason for this is ..[CBSE PMT 2002]
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a) Hg is more reactive than Pt
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b) More voltage is required to reduce H+ at Hg than at Pt
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c) Na is dissolved in Hg while it does not dissolve in Pt
0%
d) Concentration of H+ ions is larger when Pt electrode is taken
Explanation
H+ ions are discharged at higher potential when Hg cathode is used than Pt cathode Answer: (b)
Q.24
Which compound shows the highest lattice energy? [CBSE PMT 1993]
0%
a)RbF
0%
b) CsF
0%
c)NaF
0%
d)KF
Explanation
With same anion smaller the cation higher the lattice energyAnswer: (c)
Q.25
Alkali metals displace hydrogen from water forming bases due to the reason that ... [Haryana CEET 1994]
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a) They are far above the hydrogen in electrochemical series based on oxidation potential
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b) They are far below the hydrogen in electrochemical series based on oxidation potential
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c)Their ionization potential is less than that of other elements
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d)They contain only one electron in their outermost shell
Explanation
Alkali metals are electropositive than HydrogenAnswer: (a)
Q.26
Which one of the following has highest electropositive character? [ MP PMT 1998]
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a) Cu
0%
b) Cs
0%
c)Ba
0%
d)Cr
Explanation
Out of the options given Cs is alkali metal have highest electropositive character Answer:(b)
Q.27
Lithium is strongest reducing agent among alkali metals due to which of the following factor/ [ DEC 2000]
0%
a) Ionization energy
0%
b) Electron affinity
0%
c) Hydration energy
0%
d) Lattice energy
Explanation
Answer: (c)
Q.28
In Solvay ammonical process, sodium bicarbonate is precipitate due to .. [CPMT 1993]
0%
a)Presence of NH3
0%
b) Reaction with CO2
0%
c)Reaction with brine solution
0%
d)Reaction with NaOH
Explanation
NH4HCO3 + NaCl → NaHCO3 ↓ + NH4ClAnswer: (c)
Q.29
Which of the following statements is correct for CsBr3? .. [IIT 1996]
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a) It is a covalent compound
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b) It contains Cs3+ and Br- ions
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c)It contains Cs+ and Br3- ions
0%
d)It contain Cs+, Br- and Br2 molecules
Explanation
Answer: (c)
Q.30
In certain respects. lithium differs from other alkali metals. The main reason for this is ...[MP PMT 1998]
0%
a) small size of lithium atom and Li+ ion
0%
b) Extremely high electropositivity of Li
0%
c)Greater hardness of Li
0%
d)Hydration of Li+ ion
Explanation
Answer:(a)
0 h : 0 m : 1 s
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