Which of the following has minimum value of cation/anion ratio ..[CBSE PMT 1993]
44%
a) NaCl
11%
b) KCl
33%
c) MgCl2
11%
d) CaF2
Q.2.
Chile salt petre is ..[CPMT 1984]
25%
a)NaNO3
0%
b) Na2SO4
38%
c)NKO3
38%
d)Na2S2O3
Q.3.
n aqueous solution of sodium sulphate is electrolysed using inert electrodes. the products at the cathode and anode are respectively
57%
a) H2, O2
29%
b) O2, H2
14%
c)O2, Na
0%
d)O2, SO2
Q.4.
Which of the following has the highest solubility product?
43%
a) KOH
29%
b) CsOH
29%
c)LiOH
0%
d)RbOH
Q.5.
Crude common salt is hygroscopic because of presence of impurities of ...[SCRA 1991]
12%
a) CaSO4 and MgSO4
50%
b) CaCl2 and MgCl2
25%
c) CaBr2 and MgBr2
12%
d) Ca(HCO3)2 and Mg(HCO3)2
Q.6.
Causticisation process is used for the preparation of .. [CPMT 1985]
80%
a)Caustic soda
20%
b) Caustic potash
0%
c)Baryata solution
0%
d)Slaked lime
Q.7.
Which one of the following properties of alkali metals increases in magnitude as the atomic number rises [ CBSE PMT 1989]
50%
a) Ionic radius
33%
b) Melting point
17%
c)Electronegativity
0%
d)First ionization energy
Q.8.
Washing soda has formula .. [CBSE PMT 1990]
0%
a) Na2CO3 .7H2O
80%
b) Na2CO3 .10H2O
20%
c)Na2CO3.3H2O
0%
d)Na2CO3
Q.9.
Which of the following has lowest thermal stability? [ CPMT 1988]
33%
a) Li2CO3
50%
b) Na2CO3
0%
c) K2CO3
17%
d) Rb2CO3
Q.10.
Which compound show the highest lattice energy? [ CBSE PMT 1993]
33%
a)RbF
17%
b) CsF
50%
c)NaF
0%
d)KF
Q.11.
Which of the following compounds is used in gunpowder? [ Rohatak PMT 1994]
33%
a) NaNO3
17%
b) KNO3
17%
c)LiNO3
33%
d)None
Q.12.
Identify the correct statement.. [Pb PMT 1998]
40%
a) Elemental sodium can be prepared and isolated by electrolysis of aqueous solution of NaCl
0%
b)elemental Na is a strong oxidising agent
60%
c)Elemental Na is insoluble in NH3
0%
d)Elemental Na is easily oxidised
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]
75%
a) NaOH, AgNO3
25%
b) NaOH, Zn(NO3)2
0%
c) NaOH, Al(NO3)3
0%
d) Ca(OH)2, HgNO3
Q.14.
Strongest bond is between ..[CBSE PMT 1993]
20%
a)CsF
0%
b) NaCl
60%
c)Both (a) and (b)
20%
d)None of the above
Q.15.
With increase in atomic weight melting points of the alkali metals... [MP PMT 1995]
25%
a) Increases
50%
b) Decreases
25%
c)Remains constant
0%
d)Do not show definite trend
Q.16.
Anhydrous mixture of KF and HF contains which type of ions? [ JIPMER 2000]
50%
a) K+, H+, F-
0%
b) (KF)+ (HF)-
25%
c)KH+, F-
25%
d)K+, HF2-
Q.17.
When NaOH is made, the gas released at the cathode is ..[CPMT 1996]
50%
a) Cl2
0%
b) H2
25%
c)O2
25%
d)H2O
Q.18.
Which of the following has the highest melting point? [ DPMT 1998]
0%
a) NaCl
50%
b) NaF
0%
c)NaBr
50%
d)NaI
Q.19.
KO2 (potassium super oxide) is used in oxygen cylinders in space and submarine because ..[AIEEE 2002]
25%
a) Absorbs CO2 and O2 contents
0%
b) Eliminates moisture
75%
c) Absorbs CO2
0%
d) Produce Ozone
Q.20.
Fires, that result from the combustion of alkali metals can be extinguished by ..[KCET 1994]
25%
a)CCl4
50%
b) Sand
0%
c)Water
25%
d)Kerosene
Q.21.
Alkalimetals are generally extracted by ... [ Pb CET 1997]
25%
a) Reduction methods
25%
b) Double decomposition methods
0%
c)Displacement method
50%
d)Electrolytic methods
Q.22.
Cs+ ion imparts violet colour to the flame. This is due to the fact that the emitted radiations have ..[Haryana CEET 1999]
25%
a) High energy
50%
b) Low energy
25%
c)Low wavelength
0%
d)None of these
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]
25%
a) Hg is more reactive than Pt
50%
b) More voltage is required to reduce H+ at Hg than at Pt
25%
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
Q.24.
Which compound shows the highest lattice energy? [CBSE PMT 1993]
0%
a)RbF
25%
b) CsF
50%
c)NaF
25%
d)KF
Q.25.
Alkali metals displace hydrogen from water forming bases due to the reason that ... [Haryana CEET 1994]
25%
a) They are far above the hydrogen in electrochemical series based on oxidation potential
50%
b) They are far below the hydrogen in electrochemical series based on oxidation potential
0%
c)Their ionization potential is less than that of other elements
25%
d)They contain only one electron in their outermost shell
Q.26.
Which one of the following has highest electropositive character? [ MP PMT 1998]
0%
a) Cu
50%
b) Cs
25%
c)Ba
25%
d)Cr
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
75%
c) Hydration energy
25%
d) Lattice energy
Q.28.
In Solvay ammonical process, sodium bicarbonate is precipitate due to .. [CPMT 1993]
25%
a)Presence of NH3
25%
b) Reaction with CO2
25%
c)Reaction with brine solution
25%
d)Reaction with NaOH
Q.29.
Which of the following statements is correct for CsBr3? .. [IIT 1996]
33%
a) It is a covalent compound
33%
b) It contains Cs3+ and Br- ions
0%
c)It contains Cs+ and Br3- ions
33%
d)It contain Cs+, Br- and Br2 molecules
Q.30.
In certain respects. lithium differs from other alkali metals. The main reason for this is ...[MP PMT 1998]
67%
a) small size of lithium atom and Li+ ion
0%
b) Extremely high electropositivity of Li
33%
c)Greater hardness of Li
0%
d)Hydration of Li+ ion
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