Metals And Non metals

Metals are said to be sonourous because

• They produce a hard sound when they hit

• They can be drawn into thin wires

• They produce a ringing sound when they hit

Metals are generally hard. Which of these metals is an exception and is soft and can be cut with a knife?

• Iron

• Gold

• Sodium

• Magnesium

The abbreviations used to represent elements are called chemical symbols.What is the chemical symbol for Pb(plumbum)?

• Lead

• Mercury

• Zinc

• Platinum

The reaction of iron with moist air is commonly called

Non metals generally react with acids

• True

• False

The gas evolved when metals react with sodium hydroxide solution is _________

• Nitrogen

• Oxygen

• Carbon Dioxide

• Hydrogen

Magnesium ribbon burns to produce MgO and this oxide further reacts with water to give rise to Mg (OH)_2, which changes red litmus to blue one.What is the nature of this compound?

• Acidic

• Basic

• both acidic and basic

• none of these

Which of the following non-metal solution is used as antiseptic on wounds?

• sulphur

• iodine

• chlorine

• nitrogen

_______ is used for making cooking vessels and surgical instruments

Which non-metal is used to disinfect water?

• Chlorine

• Nitrogen

• Ammonia

• Iodine