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Chemistry

Chemistry
Which of the following metals is used in Space Crafts to withstand high temperatures ?

Ti
Ni
Pb
Fe

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Chemistry
Which gas emitted by power stations causes acid rain?

Helium
Sulphur dioxide
Nitrogen
Carbon dioxide

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Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

2
0.05
1
0.01

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Chemistry
If the equilibrium constants for the systems H2 + I2 ? 2HI and 2HI ? H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :

K1 = K2/2
K1 = K2
K1 = 2K2
K 1 = 1 /K2

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Chemistry
Galvanization of iron is carried out using

Chromium
Tin
Copper
Zinc

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Chemistry
Soap helps in better cleaning of clothes because

It gives strength to solution
It reduces the surface tension of solution
Soap acts like catalyst
It absorbs the dirt

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