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प्रश्न
Which among the following pairs of elements is 'not' an example of chemical twins?
विकल्प
Zr and Hf
Nb and Ta
Mo and W
Ta and Re
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उत्तर
Ta and Re
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संबंधित प्रश्न
What are chemical twins? Write ‘two’ examples.
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Compare the chemistry of actinoids with that of the lanthanoids with special reference to atomic and ionic sizes.
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Explain effects of lanthanoid contraction.
What are the consequences of lanthanoid contraction?
Explain the cause of Lanthanoids contraction.
Name an element of lanthanoid series which is well knwon to shown +4 oxidation state. Is it a strong oxidising agent or reducing agent?
What is lanthanoid contraction? Write the.............
What is the action of the following on lanthanoids?
a. water
b. Sulphur, heat
c. nitrogen, heat
What is Lanthanoid contraction?
On the basis of Lanthanoid contraction, explain the following:
Trends in the stability of oxo salts of lanthanoids from \[\ce{La}\] to \[\ce{Lu}\].
On the basis of Lanthanoid contraction, explain the following:
Stability of the complexes of lanthanoids.
Which of the following pairs has the same ionic size?
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In lanthanoid the last electron enters (n - 2)f subshell where n is equal to ______.
Cerium (Z = S8) is an important member of lanthanoids. Which of the following statements about cerium is incorrect?
State a reason for the following:
La(OH)3 is more basic than Lu(OH)3.
Trivalent Lanthanoid ions such as La3+ (Z = 57) and Lu3+ (Z = 71) do not show any colour in their solution. Give a reason.
Name an important alloy which contains some of the lanthanoid metals.
Mention uses of alloys.
