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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
WRITE SHORT ANSWER
Name three inert gases.
Define: Chemical bond
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Write the full form of IUPAC.
Name the three subatomic particles present in an atom.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
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.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
In what respects do the three isotopes of hydrogen differ? Give their structures.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
A compound containing one atom of carbon and two atoms of oxygen is ______.
The smaller particles found in the atom is called ______.
Define the following term with an example.
Metalloid
The volume occupied by 4.4 g of CO2 at S.T.P ______
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
The number of atoms present in a molecule is called its ______.
1 mole of Gold and Silver contain same number of atoms.
The most abundant type of atom is the universe is ______.
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 ______.
