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प्रश्न
Give reasons for the following statement:
Zn, Cd, and Hg are soft metals.
Zn, Cd, and Hg are soft metals. Why?
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उत्तर
Metal atoms like Zn, Cd and Hg have completely filled d-orbitals (d10 configuration). Thus, d-electrons are not available for metallic bond formation. As a result, these metals are quite soft and also have low melting points.
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संबंधित प्रश्न
What are the transition elements? Write two characteristics of the transition elements.
Which of the d-block elements may not be regarded as the transition elements?
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
Why do transition metals exhibit higher enthalpy of atomization?
Explain why transition metals and their compounds act as a catalyst.
Assertion: The highest oxidation state of osmium is +8.
Reason: Osmium is a 5d-block element.
When an oxide of manganese (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.
The element with atomic number 53 belongs to
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.
