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Q 1. The oxidation number is changed in which of the following case-
{tex} \mathrm { SO } _ { 2 } {/tex} gas is passed into {tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } / \mathrm { H } ^ { + } {/tex}
Aqueous solution of {tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} is acidified
{tex} \mathrm { CrO } _ { 2 } \mathrm { Cl } _ { 2 } {/tex} is dissolved in {tex} \mathrm { NaOH } {/tex}
{tex} \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { 2 - } {/tex} solution is made alkaline
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Q 2. Heating of Ag with dil. {tex}\mathrm{HNO_{3}}{/tex} gives
{tex} \mathrm { NO } {/tex}
{tex} \mathrm { NO } _ { 2 } {/tex}
{tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex}
{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 3 } {/tex}
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Q 3. When excess of {tex} \mathrm { SnCl } _ { 2 } {/tex} , is added to {tex} \mathrm { HgCl } _ { 2 } , {/tex} the substance formed is -
{tex} \mathrm { Hg } _ { 2 } \mathrm { Cl } _ { 2 } {/tex}
{tex}\mathrm{Sn}{/tex}
{tex} \mathrm { H } _ { \mathrm { g } } {/tex}
{tex} \mathrm { Cl } _ { 2 } {/tex}
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Q 4. A mixture of {tex} \mathrm { Mn } ^ { 2 + } \& \ \mathrm { Zn } ^ { 2 + } {/tex} can be separated by using an excess of-
{tex} \mathrm { NH } _ { 4 } \mathrm { OH } {/tex}
{tex} \mathrm { NaOH } {/tex}
{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}
{tex} \mathrm { HNO } _ { 3 } {/tex}
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Q 5. Which of the following statements concerning transition elements, is not true?
They are all metals.
They easily form complexes.
Compounds containing their ions are coloured.
They show multiple oxidation states always differing by two units.
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Q 6. The stability of particular oxidation state of a metal in aqueous solution is determined by:
Enthalpy of sublimation of the metal
Ionization energy
Enthalpy of hydration of the metal ion
All of these
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Q 7. Which of the following is likely to form white salts?
{tex} \mathrm { Cu } ^ { 2 + } {/tex}
{tex}\mathrm {Sc }^{ 3 + } {/tex}
{tex} \mathrm { Ti } ^ { 3 + } {/tex}
{tex} \mathrm { Fe } ^ { 2 + } {/tex}
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Q 8. Brass is an alloy of
Silver and copper
Copper and zinc
Copper and tin
Copper, zinc and tin