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प्रश्न
Complete the following flowchart.
उत्तर
| Exceptional properties of metals | |
| Properties | Exceptions |
|
1. Physical state: Metals exist mainly in a solid state at room temperature. 2. Hardness: Metals are generally hard. 3. Melting and boiling point: Metals have high melting and boiling points. |
1. Mercury and gallium exist in a liquid state at room temperature. 2. Lithium, sodium and potassium are metals which can be cut with a knife as they are very soft. 3. Sodium, potassium, mercury, and gallium have very low melting and boiling points. |
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संबंधित प्रश्न
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
Give a reason for Alkali metals are good reducing agents.
State one use of Silver.
What is an amalgam?
What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.
Which of the following alloys contains mercury as one of the constituents?
(a) stainless steel
(b) solder
(c) duralumin
(d) zinc amalgam
Fill in the blank
_______ is a soft metal.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
______ is a liquid metal.
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
State the position of the following in the periodic table:
Halogens
Name the following:
A halogen which is a solid at room temperature.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Soft metal : Na : : hard metal : _______
Write scientific reason.
Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.
The most abundant element in the universe is ____________.
Which of the following is not a metal?
Name two major non-metals which are present in fertilisers and enhance the growth of plants.
The metal can be cut with a knife ______.
Metals have high melting points.
