B.Mg(OH)2 (the active ingredient in milk of magnesia)
It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed an atomic theory in 1803. Dalton 's atomic theory<span> contains five basic assumptions:
- All matter consists of tiny particles called </span>atoms<span>.
</span>- Atoms are indestructible and unchangeable.- Elements are characterized by the weight of their atoms.
- In chemical reactions, atoms combine in small, whole-number ratios.
- When elements react, their atoms may combine in more than one whole-number ratio.
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Answer : The mass of NaCl added should be, 5.85 grams.
Explanation : Given,
Mass of 
= 250 g
Molality of solution = 0.40 mol/kg
Molar mass of 
= 58.5 g/mole
Molality : It is defined as the number of moles of solute present in one kilogram of solvent.
Formula used :
Now put all the given values in this formula, we get:
Therefore, the mass of NaCl added should be, 5.85 grams.
Answer:
A
Explanation:
Wearing sunglasses is not a response to an internal stimuli. It is a voluntary action instead of an involuntary one.
