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प्रश्न
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
पर्याय
(i), (ii) and (iii)
(i), (iii) and (iv)
(ii), (iii) and (iv)
(i), (ii) and (iv)
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उत्तर
(i), (ii) and (iv)
Explanation -
Dalton’s atomic theory successfully explained law of conservation of mass, law of constant composition and law of multiple proportion
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
WRITE SHORT ANSWER
What is radioactivity?
Define: Relative atomic mass
What does an atom consist of ? Explain.
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Covalent bond
How did Neils Bohr visualise the atom ?
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Fill in the blank
An excess of electrons produces a ________ charge.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
The electron shell ______ is nearest to the nucleus.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
In the nucleus of `""_20"Ca"^40`, there are ______
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
Lead is also known as plumbum.
