What properties of duralumin make it more useful than its constituent metals?
It is heavy with a high melting point
It is malleable and has high density
It is strong and light
It is hard and ductile
Correct answer is C
No explanation has been provided for this answer.
Hydrogen is used in oxy-hydrogen flames for melting metals because it
evolves a lot of heat when burnt
combines explosively with oxygen
is a very light gas
is a rocket fuel
Correct answer is A
No explanation has been provided for this answer.
sodium trioxonitrate (V) and calcium chloride
sodium dioxonitrate (III) and ammonium chloride
sodium trioxonitrate (V) and ammonium chloride
sodium dioxonitrate (III) and potassium chloride
Correct answer is C
The reaction between NaNO\(_3\) and NH\(_4\)Cl gives NaCl and NH\(_4\)NO\(_3\).
Upon heating, NH\(_4\)NO\(_3\) yields 2 moles of H\(_2\)O and N\(_2\)O.
Na2SO4
Na2SO3
Na2S
Na2CO3
Correct answer is B
No explanation has been provided for this answer.
Chlorine, bromine and iodine resemble one another in that they?
dissolve in alkalis
react violently with hydorgen without heating
are liquids
displace one another from solutiions of their salts
Correct answer is D
Halogens undergo displacement reactions with halides solutions. A more reactive halogen can displace a less reactive halogen from its halide