The alkali metals have:
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Explanation
(b) Atomic radius decrease along the period.
NEET Practice Questions (MCQs) with Answers & Solutions
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The telluric helix was given by:
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Explanation
The telluric helix was proposed by Alexandre-Emile Béguyer de Chancourtois in 1862. He arranged the elements in a spiral on a cylinder with elements having similar properties lining up vertically.
The element with atomic number 30 is expected to be present in:
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Explanation
(d) According to its electronic configuration.
The correct order of acid strength is:
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Explanation
(a) Higher is the oxidation number of non-metal, more is acidic nature. higher the electro -vety ,higher will be acidic.
Which is called a bridge element?
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Explanation
Magnesium (Mg) is considered a bridge element as it exhibits properties of both s-block and p-block elements. It has properties intermediate between the highly reactive alkaline earth metals and the more electropositive elements of the p-block.
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
[2005]
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Transition elements show:
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Explanation
(d) All are the characteristics of transition metals.
The transition elements are more metallic than the representative elements because they have:
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Explanation
(c) It is a fact.
Chloride of an element A gave a neutral solution in water. In the periodic table the element A belongs to
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Explanation
MCln does not undergo hydrolysis. This implies than Mn+ on hydrolysis form a strong base i.e. M(OH)n.
Elements of first grioup forms strong bases and that of third group, fifth group and transition metals form weak bases.
Which of the following statement is correct with respect to the property of elements with increase in atomic number in carbon family.
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Explanation
Group 14 elements exhibit oxidation states of +4 and +2. In +4 state the compounds are ionic. The +4 state becomes less important in Ge, Sn and Pb because they prefer to exhibit +2 state for ionic bond formation due to inert pair effect. The inert pair effect decreases down the group from Ge to Pb and stability of +4 oxidation state decreases and that of +2 state increases. Thus stability of M2+ ions is in the order Ge2+<Sn2+<Pb2+.
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