Advertisements
Advertisements
प्रश्न
Indicate whether the following statement is true or false:
Noble gases are high reactive
पर्याय
True
False
Advertisements
उत्तर
False
Correct Statement: Noble gases are non-reactive
APPEARS IN
संबंधित प्रश्न
Name: a non-metal which is lustrous
Answer the following question:
What do you understand by the statement: ‘metals are ductile and malleable’?
Fill in the blank
The most abundant element in the atmosphere is _______.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
Differentiate between elements and compounds.
How are elements classified?
