Which of these metals, Mg, Fe, Pb and Cu will dissolve in dilute HCI?
All the metals
Mg ,Fe and Cu
Mg, Fe and Pb
Mg and Fe only
Mg only
Correct answer is D
No explanation has been provided for this answer.
more heat is absorbed in (l)
more heat is absorbed in (ll)
less heat is evolved in (l)
reaction (ll) proceeds faster than (l)
reaction (l) proceeds faster than (ll)
Correct answer is C
No explanation has been provided for this answer.
An element is electronegative if
it has a tendency to exist in the gaseous from
its ions dissolve readily in water
it has a tendency to lose electrons
it has a tendency to gain electrons
it readily froms covalent bonds
Correct answer is D
No explanation has been provided for this answer.
heating the affected parts in order to boil off the petroleum
mechanically stirring to dissolve the petroleum in water
pouring organic solvents to dissolve the petroleum
spraying the water with stergents
cooling to freeze out the petroleum
Correct answer is C
No explanation has been provided for this answer.