Advertisements
Advertisements
प्रश्न
Select the correct answer from the choice in the bracket.
The least reactive metal.
विकल्प
magnesium
silver
copper
Advertisements
उत्तर
silver
APPEARS IN
संबंधित प्रश्न
Give Two Examples for Each of the Following: Metalloids
Name: a Metal Which is brittle
Give two examples of Metals.
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
Give two examples of the following.
Elements which are liquids
Define:
Atomicity
Name A substance used as an insulator.
Give reason: A frying pan is made up of steel but its handle is made up of wood.
Give reason: Argon is filled in electric bulbs.
Find the atomicity of the Following molecule:
Acetic Acid
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
Tick (√) the correct alternative from the choice given for the following statement.
Atoms of different kinds combine to form molecules of
Differentiate between the terms –
elements, compounds & mixtures.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Complete the statement given below by filling in the blanks with the correct words.
Atom contains ________ , with positively charged _____.
Write the names of elements from the following symbol:
Si
Give an example of two liquids that form heterogeneous mixtures.
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.
What are elements? What are they made of?
Name the constituents of water.
