Welcome to your Ncert - class 9- science - Chapter 3 – Atoms and Molecules 2
The formula of a compound is Ca3 (PO4)2. What is the valency of Ca in it?
Which has the largest number of molecules?
Who suggested that if we go on dividing matter, a stage will come when particles obtained can’t be divided further?
Which of the following is a binary compound?
The number of gram-molecules of O2 in 6.023 x 10^24 CO molecules is
The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
Copper reacts with oxygen to form two oxides, Cu2O and CuO. The ratio between the masses of copper which react with a fixed mass of oxygen is
The element whose gram-atomic mass and gram-molecular mass are the same is
The mass percentage of hydrogen (H) in water is
Phosphorus is :
An atom is the
The reference standard used for defining atomic mass unit is
The accepted unit of atomic mass and molecular mass is
A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the
The mass of one Avogadro’s number of N atoms is equal to
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