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Which of aqueous solution is coloured ? [IIT-1990]

A. $ Zn (NO_3)_2 $ B. $ LiNO_3 $ C. $ Co (NO_3)_2 $ D. Potash Alum

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Explanation

Aqueous solutions of transition metal salts are often colored due to d-d electron transitions. $ Co (NO_3)_2 $ contains cobalt, a transition metal, which typically forms colored solutions. In contrast, $ Zn (NO_3)_2 $ and $ LiNO_3 $ contain zinc and lithium, respectively, which do not have partially filled d-orbitals and thus form colorless solutions. Potash Alum, while sometimes appearing colored due to impurities, is generally colorless in its pure form.

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Which of the following pollutant cannot be degraded by natural process ?

A. DDT B. Nuclear waste C. Heavy metals D. all of the above

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Which of the following bacteria are responsible for the Gastrointestinal Disease ?

A. E.coli B. S Faecalis C. Both 1 and 2 D. Saurous

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The prescribed upper limit concentration of lead in drinking water is about

A. 30 ppb B. 70 ppb C. 50 ppb D. 60 ppb

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What is the range of pH of acid rain?

A. More than 5.6 B. In between 5.6 to 6.6 C. Less than 5.6 D. In between 6.00 to 6.66

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Which of the following statement is incorrect ?

A. Taj Mahal is affected by hydrocarbon. B. Building are adversely affected by acid rain. C. Due to acid rain, micro organisms are affected D. Large amount of acid rain decreases soil fertility.

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Which of the following disease increase due to Green house Gases effect ?

A. Malaria B. Dengue C. Yellow fever D. All of the above.

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Which of the following chemist associate with Green house Gas effect ?

A. Jean fowier B. Chamberlin C. Swante Arrhenius D. Both 2 & 3

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Which of the following is used in aerosols ?

A. NOx B. SOx C. CFC D. COx

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The Diameter of solid dust particle is

A. $ 10 ^ {-2} $ meter B. $ 10 ^{-6} $ meter C. $ 10 ^ {-4} $ meter D. $ 10 ^ {-1} $ meter

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