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Chemistry - (22-Oct-2016)
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Ques: 1

Hydraulic separation method is used for the concentration of which ore?

Cassiterite

Haematite

Calamine

Galena

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Ques: 2

A certain laser transition emits $$6.37 \times 10^{25}$$ quanta per second per square meter. The power output in joules per square meter per second would be ( $$\lambda = 632.8$$ nm)

$$5 \times 10^{5} Jm^{-2} sec ^{-1}$$

$$2 \times 10^{-3} Jm^{-2} sec ^{-1}$$

$$9.2 \times 10^{-3} Jm^{-2} sec ^{-1}$$

$$2 \times 10^{7} Jm^{-2} sec ^{-1}$$

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Ques: 3

A gas $$X$$ bleaches the colour of flowers by reduction, while the other gas $$Y$$ by oxidation. These two gases $$X$$ and $$Y$$ are respectively

$$CO$$ and $$CO_{2}$$

$$NH_{3}$$ and $$SO_{3}$$

$$CO_{2}$$ and $$Br_{2}$$

$$SO_{2}$$ and $$Cl_{2}$$

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Ques: 4

Diels-Alder reaction is used to synthesise a ring of

four carbon atoms

five carbon atoms

three carbon atoms

six carbon atoms

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Ques: 5

For the complex, $$Ag^{+}+2NH_{3}\rightarrow [Ag(NH_{3})_{2}^{+}]$$ ,
$$(\dfrac{dx}{dt})=2\times 10^{7}L^{2}mol^{-2}s^{-1}[Ag^{+}][NH_{3}]^{2} = 1\times 10^{-2}s^{-1}[Ag(NH_{3})_{2}^{+}]$$ .
Hence, the ratio of rate constants of the forward and backward reactions is

$$2\times 10^{7}$$ $$L^{2}$$ $$mol^{-2}$$

$$2\times 10^{9}$$ $$L^{2}$$ $$mol^{-2}$$

$$1\times 10^{-2}$$ $$L^{2}$$ $$mol^{-2}$$

$$0.5\times 10^{-9}$$ $$L^{2}$$ $$mol^{-2}$$

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