Saran is a copolymer of . | Chemistry Questions a.vinyl chloride and vinyl acetate b.vinylidene chloride and vinyl chloride c.ethylene chloride and vinyl chloride d.vinyl acctate and methyl acetate

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Answer:

percent vinylidene chloride and vinyl chloride, or methyl methacrylate.

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Saran is a copolymer of vinylidene chloride and vinyl chloride.

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Asprin is an: | Chemistry Questions a.analgesic b.antipyretic c.antimalarial d.both analgesic and antipyretic

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d) Both analgesic and antypyretic

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Answer:

answer is both analgesic and antipyretic

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A increase in both atomic and ionic radii with atomic number occurs in any group of the Periodic table and in accordance with this the ionic radii of Ti(IV) and Zr(IV) ions are 0.68 A^o and 0.74 A^o respectively; but for Hf(IV) ion the ionic radius is 0.75 A^o which is almost the same as that for Zr(IV) ion. This is due to: a.greater degree of covalency in compound of Hf^4 + b.lanthanide contraction c.difference in the coordination number of Zr^4 + and Hf^4 + in their compounds d.actinide contraction

Correct option is B)

Lanthanide contraction : The regular decrease in the size of lanthanide ions is known as lanthanide contraction. It is due to greater effect of the increased nuclear charge than that of the screening effect. Consequences of lanthanide contraction(a) It results in slight variation in their chemical properties which helps in their separation by ion exchange

(b) Each element beyond lanthanum has same atomic radius as that of the element lying above it in the group (e.g. Zr 145 pm, Hf 144 pm); Nb 134 pm, Ta 134 pm ; Mo 129 pm, W 130 pm).

Oxidation number of sulphur in Na2S2O3 would be : a.4 b.2 c.-2 d.0

Answer:

Therefore, the oxidation state of sulphur atoms in Na2S2O3 is −2 and +6

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What is the cause of Green house effect? a.Infrared rays b.Ultraviolet rays c.X - rays d.Radio waves
option(A) infrared rays

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Step-by-step explanation:

b.ultraviolet rays

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