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प्रश्न
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
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उत्तर
In water, the ratio of oxygen to hydrogen is 8:1 by mass.
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संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the :-
Sulphuric acid
Write the names of `"FeS"` compounds :
Define: Mass number
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
A charged particle is called an _____
State two observations which show that atom is not indivisible.
What is an atom ? How do atoms usually exist ?
Draw the diagrams representing the atomic structures of the following: Neon
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
A compound containing one atom of carbon and two atoms of oxygen is ______.
Which of the following statements made by Dalton has not undergone any change?
In all atoms of an element
An element is composed of ______ atoms.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
______ is a substance that is made up of three oxygen atoms chemically combined.
The first scientific theory about atoms was given by J J. Thomson.
