18 Questions
Which physical property of metals makes gallium and caesium exceptions to the general rule that metals exist as solids at room temperature?
Low melting point
What will be the action of sodium (Na) on water?
It will react violently, producing hydrogen gas and sodium hydroxide.
Which allotrope of carbon is a conductor of electricity, contrary to the typical property of non-metals?
Graphite
Why are platinum, gold, and silver used to make jewellery?
Because they are very malleable and do not corrode easily.
What unique property of iodine makes it stand out as a non-metal despite its lustrous appearance?
Lustrous appearance
What type of oxides are formed when non-metals combine with oxygen?
Acidic oxides
What property allows alkali metals like lithium, sodium, and potassium to be cut with a knife?
Softness
Why are sodium, potassium, and lithium stored under oil?
To prevent them from reacting with water or air.
In the reactivity series of metals, which metal would react the most vigorously with water?
Sodium
Why is aluminium used to make utensils for cooking despite being a highly reactive metal?
Because it forms a protective oxide layer that prevents further reactions.
Which type of metal oxide layer protects the underlying metal from further corrosion?
Thick and flaky oxide layer
Why are carbonate and sulphide ores usually converted into oxides during the extraction process?
To stabilize the ores and prevent them from reacting further.
Which property of metals is described as having a shining surface?
Metallic lustre
What is the purpose of holding a piece of sodium metal with tongs and drying it before cutting it with a knife?
To avoid a violent reaction due to the high reactivity of sodium with air
Which metal would be the easiest to cut with a sharp knife based on the activity described?
Copper
Which process involves rubbing metal samples with sandpaper to observe changes in appearance?
Cleaning for metallic lustre
Which metal is placed higher in the reactivity series than sodium?
Magnesium
'Ductility' is a property of metals that refers to their ability to:
Form into thin wires without breaking
Explore the uses of metals and non-metals in daily life and understand the properties that classify elements into these categories. Learn how these properties are related to the practical applications of these elements. Dive into the physical properties of metals in detail.
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