Alkali and alkaline E. metals

Which ion will NOT produce a red flame

• sodium

• lithium

• strontium

• calcium

The colour in a flame test is due to

• absorbed light as electrons move up

• absorbed light as electrons move down

• emited light as electrons move up

• emited light as electrons move down

Which ion produces green flame

• soidum

• barium

• magnesium

• lithium

Magnesium ion produces colourless flame because

• it does not absorb heat

• electrons do not move up

• electrons do not return to gr. state

• emited light is outside visible range

Which acid is usually used to prepare samples for a flame test?

• hydrochloric

• sulfuric

• phosphoric

• nitric

Which two ions produce a lilac flame?

• K+ and Cs+

• Ca2+ and Mg2+

• Li+ and K+

• Cs+ and Ca2+

What alloy is used to make wires for flame test?

• duralumin

• nichrome

• brass

• bronze

What colour is the flame of sodium?

• blue

• green

• yellow

• red

If the flame colour is red, it could be

• barium

• sodium

• potassium

• lithium

What colour is observed when magnesium chloride is burnt?

• red

• green

• lilac

• no colour