Which one of the following gases burn with pop sound?
Hydrogen
Nitrogen dioxide
Sulphur dioxide
Oxygen
Which scientist discovered the radioactive element radium?
Albert Einstein
Benjamin Franklin
Isaac Newton
Marie Curie
Ozone is
an allotrope of oxygen
an isomer of oxygen
a compound of oxygen
an isotope of oxygen
A.
an allotrope of oxygen
Brine' is
Common name of bleaching powder
aqueous solution of chlorine
saturated solution of NaCl
aqueous solution of Na2SO4
In laboratory, ethylene and acetylene can be distinguished by
Br2/H2O
KMnO4/OH/H2O
Tollens' reagent
Fehling solution