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Complete the following chemical equations:
`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`
`(ii) 2CrO_4^(2-)+2H^+ ->`
`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`
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Pb(NO3)2 on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas
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Account for the following:
Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.
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Account for the following:
Cr2+ is a strong reducing agent.
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Account for the following:
Cu+2 salts are coloured, while Zn2+ salts are white.
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The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Write the element which shows maximum number of oxidation states. Give reason.
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The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element has the highest m.p?
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The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
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The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element is a strong oxidising agent in +3 oxidation state and why?
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Why do the transition elements have higher enthalpies of atomisation?
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In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
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Give reasons for the following observations:
Physisorption decreases with increase in temperature.
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How would you account for the following: Transition metals form complex compounds.
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Write the names and structures of the monomers of the following polymers: Buna-N
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Differentiate between adsorbtion and absorption.
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Give reasons:
Transition metals show variable oxidation states.
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What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 1/3rd of tetrahedral voids?
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What are the transition elements? Write two characteristics of the transition elements.
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How would you account for the following : Transition metals form coloured compounds
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Define the following term: Primitive unit cells
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