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प्रश्न
Give one use of the following substance:
Coal
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उत्तर
Coal: Coal is used as fuel also used in thermal power plants to produce electricity.
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संबंधित प्रश्न
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
The most ductile metal.
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Complete the statement given below by filling in the blank with the correct word.
Element ______ has the symbol derived from its Latin name ‘Argentum’
Write the names of elements from the following symbol:
Ir
Explain the difference between Atoms and molecules.
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
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.
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Give two example of elements.
