Welcome to your Ncert - class 9- science - Chapter 3 – Atoms and Molecules 2
The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
The mass of one Avogadro’s number of N atoms is equal to
The mass percentage of hydrogen (H) in water 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 reference standard used for defining atomic mass unit is
Phosphorus is :
The element whose gram-atomic mass and gram-molecular mass are the same is
The accepted unit of atomic mass and molecular mass is
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?
The number of gram-molecules of O2 in 6.023 x 10^24 CO molecules is
Which of the following is a binary compound?
An atom is the
A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the
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