Answer:
Test for sulphate ion present in a given salt: Add barium chloride solution. If white precipitate is formed, presence of SO42- ion is confirmed.
Explanation:
<span>Biological specimens have been preserved in alcohol and formalin for many years.This could damage the specimen and change the colour of the fluid.Engineered fluids are now used as a substitute for formalin as it is a more sustainable medium..Novec fluids which are low in toxicity are also used.</span>
As we know that
Polarity exists due to presence of charges. And charges are generated in molecules due to
Electronegativity differences. The element with higher electronegativity will have
partial negative charge, while element with less electronegativity will have
partial positive charge. This partial positive and partial negative charge on a molecule makes it
polar.
Polarity mainly depends upon the
shape of a molecule. For example, In
water Oxygen being more electronegative is partial negative and Hydrogen being less electronegative is partial positive. It is polar and has a
bent structure. It means the two bond moments are not cancelling each other hence the water molecule has a net dipole moment of
1.84 D.
Secondly,
CO₂ (Carbon dioxide) also has a more electronegative Oxygen atom and less electronegative Carbon atom. In this case the net dipole moment on CO₂ is
zero. This is because the structure of CO₂ is
linear. As the two dipoles being equal and opposite
cancel out the effect of each other making the CO₂ molecule
non-polar.
<span>the reaction is endothermic
</span><span>the δh is positive</span>
<span>The correct answer is D.how wind and temperature affect your body in winter. Basically, it's how you perceive the cold weather on your skin regardless of what the temperature actually is. It's usually lower and that's why you have forecasts say that it will be for example 0, but it will feel like -5 degrees Celsius.</span><span />