In group 16, the stability of + 6 oxidation state decreases and that of + 4 oxidation state increases down the group. Why ?
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Elements of group 14 (a) exhibit oxidation state of +4 only (b) exhibit oxidation state of +2 and +4
(b)The elements of group 14 have 4 valence electrons. Therefore, the oxidation state of the group is +4. However, as a result of the inert pair effect, the lower oxidation...
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What is Down’s syndrome? Give its symptoms and cause. Why is it that the chances of having a child with Down’s syndrome increases
Down’s syndrome is a human genetic disorder caused due to trisomy of chromosome no. 21. Such individuals are aneuploid and have 47chromosomes. (2n + 1) The symptoms include mental retardation,...
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The electrical conductivity of a metal decreases with rise in temperature while that of a semi-conductor increases. Explain.
In metals with increase of temperature, the kernels start vibrating at faster rate and thus offer resistance to the ow of electrons. Hence, conductivity decreases. In case of semi-conductors, with...
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The tendency to exhibit – 3 oxidation state, decreased down the group in group 15 elements. Explain.
[Hint : Due to increase in size and decrease in electronegativity down the groups.]
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Thermal stability of hydrides of group 16 elements decreases down the group. Why ?
[Hint : Because down the group E H bond dissociation enthalpy decreases.]
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Assign a possible reason for the following : (a) Stability of + 5 oxidation state decreased and that of + 3 oxidation
[Hint : (a) Due to inert pair effect. (b) Due to more bond dissociation enthalpy of O H as compared to S H bond. (c) Due to more steric hindrance...
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(i) Electropositive nature of the element(s) increases down the group and decreases across the Period
(a) Lithium (b) Fluorine (c) Fluorine (d) Boron (e) Carbon
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It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens?
It is a convex lens. No, when the object is placed close to a convex lens then the image formed is virtual which cannot be obtained on screen.
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If a glass prism is dipped in water, its dispersive power (a) increases (b) decreases
(b) decreases
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The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
(c) : Due to the inert pair effect (the reluctance of ns2 electrons of outermost shell to participate in bonding) the stability of M2+ ions (of group IV elements) increases...
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