While extracting an element from its ore, the ore is grind and leached with dil. KCN solution to form the soluble product potassium argento-cyanide. The element is …[ AIPMT 1989]
14%
a) Lead
43%
b) Chromium
29%
c) Manganese
14%
d) Silver
Q.2.
The solubility of silver bromide in hypo solution is due to the formation of ..
43%
a) Ag2SO3
14%
b) Ag2S2O3
29%
c) [Ag(S2O3 )]-
14%
d) [Ag(S2O3 )2]3-
Q.3.
Why do theoritical value of magnetic moment differ from their practical value ?
0%
a) Due to decrease in volume of metal ion.
33%
b) Due to unsymmetrical arrangement of dipoles in orbital.
33%
c) Due to rotation-orbital combination.
33%
d) Both are different methods to calculate magnetic moment.
Q.4.
Amalgams are
17%
a) Always solid
17%
b) Highly coloured alloys
50%
c) Alloys which contain mercury as one of the contents
17%
d) Compounds of mercury
Q.5.
The electronic configuration of actinoids can not be assigned with degree of certainty because of
33%
a) Small energy difference between 5f and 6d-levels
33%
b) Overlapping of inner orbitals
0%
c) Free movement of electrons over all the orbitals
33%
d) None of the above
Q.6.
Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuration is ..(At.no, Ti=22, V=13, Cr=24, Mn=25) [ AIPMT 2004]
20%
a) Ti3+, V2+, Cr3+, Mn4+
40%
b) Ti+, V4+, Cr6+, Mn7+
0%
c) Ti4+, V3+, Cr2+, Mn3+
40%
d) Ti2+, V3+, Cr4+, Mn5+
Q.7.
The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration ..[ PET 1993]
20%
a) 3d2
60%
b) 3d5
0%
c) 3d7
20%
d) 3d9
Q.8.
Which is formed when iron reacts with carbon?
20%
a) FeC2
0%
b) Fe3C
80%
c) FeC3
0%
d) Fe2C
Q.9.
Which one of the following statements related to lanthanons is incorrect? [ NEET 2016]
40%
a) Europium shows +2 oxidation state
40%
b) The basicity decreases as the ionic radius decreases from Pr to Lu
20%
c) All the lanthanons are much more reactive than aluminium
0%
d) Ce(+4) solution are widely used as oxidizing agent in volumetric analysis
Q.10.
Transition elements are coloured due to ... ..
20%
a) Small size
0%
b) Metallic nature
60%
c) unpaired d-electrons
20%
d) None of these
Q.11.
In aqueous solution, Eu2+ acts as
20%
a) An oxidizing agent
40%
b) Reducing agent
0%
c) Can act as either of these
40%
d) Can act as redox agent
Q.12.
In which of the following pairs are both the ions coloured in aqueous solution? ( At no Sc=21, Ti=22, Ni=28, Cu=29) [AIPMT 2006]
40%
a) Ni2+, Ti2+
20%
b) Sc3+, Ti3+
20%
c) Sc3+, Co2+
20%
d) Ni2+, Cu+
Q.13.
Which compound cannot be prepared?
0%
a) Zn(OH)2
20%
b) Cd(OH)2
60%
c) Hg(OH)2
20%
d) HgCl2
Q.14.
Match column-A and column-B properly.
Brass
a. Ni (60%) Cr (40%)
Bronze
b. Cu (80%) Sn (20%)
Cupronicle
c. Cu (90%) Sn (10%)
Nichrome
d. Cu (70%) Zn (30%)
-- --
e. Cu (75-85%) NI (25-15%)
60%
a) 1 → d; 2 → c; 3 → e; 4 → a
20%
b) 1 → d; 2 → c; 3 → e; 4 → b
20%
c) 1 → d; 2 → e; 3 → a; 4 → b
0%
d) 1 → e; 2 → c; 3 → a; 4 → d
Q.15.
Nessler’s reachent is …[ PET 1993]
0%
a) KHgI4
25%
b) K2HgI4
50%
c) K2HgI4 + NaOH
25%
d) KHgI4 + NaOH
Q.16.
The properties of Zr and Hf are similar because ... ..
0%
a) both belong to d-blck
20%
b) both belong to same group of the periiodic table
60%
c) both have similar radiii
20%
d) both have same number of electrons
Q.17.
The reduction of aqueous KMnO4 with H2O2 in acidic conditions gives [ AIPMT 2014]
0%
a) Mn4+ and O2
50%
b) Mn2+ and O2
25%
c) Mn2+ and O3
25%
d) Mn4+ and MnO2
Q.18.
On which factor, does the stability of an oxidation state in lanthanide elements depend ? [Gujarat-2008]
25%
a) Combined effect of hyadration energy and ionization energy.
50%
b) Electronic configuration
25%
c) Enthalpy
0%
d) Internal energy
Q.19.
Which ore contains both iron and copper? [ IIT 2005]
25%
a) Cuprite
0%
b) Chalcocite
0%
c) Chalcopyrite
75%
d) Malachite
Q.20.
Nitriding is the process of surface hardening of steel by treating it in an atmosphere of ..[ AIPMT 1989]
25%
a) NH3
50%
b) N2
25%
c) O3
0%
d) H2S
Q.21.
A element having atomic no. 56 is included in [AFMC-2003]
50%
a) Lanthanides
0%
b) Actindies
25%
c) Alkaline earth metals
25%
d) None of above
Q.22.
The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ ( At.no. Y=39, La=57, Eu = 63, Lu=71) [ AIPMT 2003]
33%
a) Lu3+ < Eu3+ < La3+ < Y3+
0%
b) La3+ < Eu3+ < Lu3+ < Y3+
33%
c) Y3+ < La3+ < Eu3+ < Y3+
33%
d) Y3+ < Lu3+ < Eu3+ < La3+
Q.23.
Which of following statement is correct for transition elements ? [AFMC - 2002]
0%
a) They are very active.
67%
b) They show variable valencies.
33%
c) They show lower melting point.
0%
d) They are stong electropositive elements.
Q.24.
Which one of the following ionic species will impart colour to an aqueous solution? [ AIPMT 1998]
0%
a) Ti4+
0%
b) Cu+
50%
c) Zn2+
50%
d) Cr3+
Q.25.
A blue colouration is not obtained when …
0%
a) Ammonium hydroxide dissolves in copper sulphate
0%
b) Copper sulphate solution reacts with K4[Fe(CN)6]
100%
c) Ferric chloride reacts with sodium ferrocyanide
0%
d) Anhydrous white CuSo4 is dissolved in water
Q.26.
In the electrolytic purification of copper some gold is found in the …
0%
a) Cathode
0%
b) Cathode mud
50%
c) Anode mud
50%
d) None of these
Q.27.
Which of the following is amphoteric oxide? [ AIEEE 2003]
33%
a) SO2
0%
b) B2O3
67%
c) ZnO
0%
d) Na2O
Q.28.
Ferric oxide in furnace is reduced by …
0%
a) C
0%
b) H2
50%
c) CO
50%
d) CO2
Q.29.
Which statement about group 12 elements is wrong? [ PET 1991]
0%
a) Zinc forms an alloy with copper
33%
b) Zn22+ is stable
0%
c) Mercury gives compounds with +1 and 2+ valencies
67%
d) Hg is liquid element
Q.30.
Zinc white is a better white pigment than lead white because it …
0%
a) Has more covering power than lead white
33%
b) Is not blackened by the action of H2S
0%
c) Is soluble in water
67%
d) Becomes yellow when heated
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