chemistry quiz

most electopositive element

• potassium

• calcium

• cesium

• francium

element with highest electron affinity in periodic table

• fluorine

• helium

• chlorine

• iodine

Element in group 1 period 4(caps)

(a)  

the element in group 18 period 2

• helium

• neon

• crypton

• xenon

colour of copper oxide

• black

• white

• yellow

• red

what is the effect of H2S on acidified potassium permanganate

• pink to colourless with yellow sulphur particles

• no effect

• pink to green

• only piink to colourless with no sulpphur particles

what are the substance which on exposure to atmosphere absorb moisture form atmosphere

• deliquescent subustance

• efflorescent substance

• acidic substance

• basic substance

formula of glaubers salt

• Na2So4.10H2O

• CH4

• CaSO4.2H2O

• MgSO4.7H2O

test for nitrogen di oxide

• turns potassium iodide paper brown

• rekindles a glowing splinter

• burns with a pop sound

• turns moist lead acetate paper silvery black

Amount og energy required to remove an electron from the outermost shell of an isolated atom(caps)

(a)