Consider the following statements: 1. Specific conductance decreases with dilution. 2. Equivalent conductance increases with dilution. Which is/are correct?
Explanation:
Specific conductance (conductivity) is the conductance of a 1 cm³ solution. It decreases with dilution because the number of ions per unit volume decreases. Equivalent conductance is the conductance of all ions produced by 1 gram equivalent of electrolyte. It increases with dilution because the ions have more space to move, reducing interionic attractions.
Explanation:
Heavy water (D2O) contains deuterium (an isotope of hydrogen) instead of normal hydrogen. It has a higher molecular mass and absorbs neutrons much less efficiently than ordinary water. Because of this property, it is extensively used as a neutron moderator in certain types of nuclear reactors (like CANDU) to slow down neutrons.
Explanation:
The mass of an atom is almost entirely concentrated in its tiny central nucleus. This is because the nucleus contains protons and neutrons, which are much heavier than the extranuclear electrons. Since electrons have negligible mass, R correctly explains why the mass is localized in the nucleus.
No comments yet. Be the first to start the discussion!