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प्रश्न
A change in the physical state can be brought about
विकल्प
only when energy is given to the system
only when energy is taken out from the system
when energy is either given to or taken out from the system
without any energy change
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उत्तर
when energy is either given to or taken out from the system
When energy is given to the system the solid state changes to liquid. When energy is taken out from a liquid it changes to solid e.g., ice changes to water and water to water vapours when heat energy is given. Water vapours or steam condense to water and water freezes to ice when energy is decreased.
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ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Atom
Define:- Radicals
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the :-
Sulphuric acid
Fill in the blank:
Atoms are _____
Name the particles which revolve around the nucleus.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Give two examples for each of ionic and covalent bond.
Fill in the blank
An _______ is electrically neutral.
How is the size of an atom indicated ?
What value has been given to the mass of this reference atom ?
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Electron, proton, neutron are the types of ______ in an atom.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
State true or false. If false, correct the statement.
An atom is electrically neutral.
K: Potassium:: C: ______.
Define the following term with an example.
Compound
Atoms of one element can be transmuted into atoms of other elements by ______
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
