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प्रश्न
Give an example of a metal which can be easily cut with a knife.
Name the following:
The two metals which can be cut with a knife.
उत्तर
- Sodium (Na)
- Potassium (K)
संबंधित प्रश्न
Classify the following elements into metals, non–metals and metalloids: C, Mg, Si, S, Hg, As.
Fill in the blanks:
Phosphorus is a very _________ non-metal.
Give reasons for the following.
Aluminium foils are used to wrap food items.
Why are metals used for making cooking vessels?
Why is ammonia gas not collected over water?
Write the name and formulae of a non-metal hydride.
Name two metals which are used for making electric wires.
State one use of Hydrogen.
State one use of Nitrogen.
Name a non-metal having lustre (shining surface).
State any three differences between the physical properties of metals and non-metals.
State three reasons (of which at least one must be chemical) for believing that sodium is a metal.
Give four differences between metals and non-metals with reference to their:
- Melting point and boiling point
- The conductivity of heat and electricity
- Malleability
- Solubility
Tick (√) the most appropriate answer.
A metal which is a poor conductor of electricity is:
Name a metal which can be cut with a knife :
State two important uses of following non-metals
Uses of nitrogen
State two important uses of following non-metal
Uses of graphite
Name:
a non-metal which is ductile
Name:
a non- metal used in alloys
`N+—→ N^3-`
`Mg +H_2SO_4 → —+ — `
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Amphoteric oxide …………
The table below compares some properties of metals and non-metals. Write down the missing
statements (i) to (iv) :
| Metals | Non-metals |
| (i) ………………….. | Poor conductors of heat |
| (ii) Malleable | …………………… |
| (iii) Form positive ions | …………………… |
| (iv) ………………… | Form acidic oxides |
How many valence electrons are present in:
(i) metals and
Identify the odd term.
Write scientific reason.
The stainless steel vessels in Kitchen have copper coating on the bottom.
Name two metalloids.
The metal other than aluminium, which has a strong affinity for oxygen is ______.
Distinguish between the physical properties of metals and non-metals with reference to:
(a) lusture (b) malleability (c) ductility (d) tensile strength (e) sonority (f) conduction of heat and electricity (g) melting and boiling point (h) density.
Select the appropriate option for the following statement:
The element which is noble gas and radioactive in nature.
State whether the statement given below is true or false. If false write the correct statement.
Lead pencils contain lead.
_______ is basic oxide.
Oxygen, hydrogen, and sulphur are examples for
The non-metal which conducts electric current is
Name six common non-metals and write their symbols.
Which of the following non-metal is lustrous?
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is non-metal?
