Answer:
The molar concentration of Fe²⁺ in the original solution is 1.33 molar
Explanation:
Moles of K₂Cr₂O₇ = Molarity x Volume (lit)
= 0.025 x 35.5 x 10⁻³
= 0.0008875
Cr₂O₇²⁻ + 6 Fe²⁺ + 14 H⁺ → 2 Cr³⁺ + 6 Fe³⁺ + 7 H₂O
From equation
1 mole K₂Cr₂O₇ used for the oxidation of 6 moles Fe²
0.0008875 mole K₂Cr₂O₇ used for the oxidation of =
= 0.005325 mole of Fe²
Molarity = 
Molar concentration of Fe² = 
= 1.33 molar
So molar concentration of Fe²⁺ in the original solution = 1.33 molar
Copper is a mineral and an element essential to our everyday lives. It is a major industrial metal because of its high ductility, malleability, thermal and electrical conductivity and resistance to corrosion. It is an essential nutrient in our daily diet. And, its antimicrobial property is becoming increasingly important to the prevention of infection. It ranks third after iron and aluminum in terms of quantities consumed in the USA.
Answer: Options (a) and (d) are the correct answer.
Explanation:
A catalyst is the substance which helps in increasing the rate of reaction.
Activation energy is the minimum amount of energy required by reactants to start the reaction. On addition of catalyst, the path of reaction changes because the energy barrier gap reduces and hence, the activation energy also decreases.
In the absence of catalyst, we need to increase the temperature so that reaction can occur quickly.
Whereas on addition of catalyst, there is no need to increase the temperature as the catalyst itself is sufficient to increase the rate of reaction. As a result, temperature should be lowered when there is addition of catalyst in the reaction.
Thus, we can conclude that catalysts can save money by essentially lowering the activation energy and temperature required.
Answer:
Water
Explanation :-
Higher the intermolecular forces between the liquid particles, higher its boiling point.
