Welcome to your Ncert - class 9- science -Chapter 3 – Atoms and Molecules 1
Number of atoms in 560 g of Fe (atomic mass = 56 u) is
Hydrogen combines with oxygen to form
The average molecular mass of a mixture of gas containing nitrogen and carbon dioxide is 36. The mixture contains 280 g of nitrogen. Therefore, the amount of CO2 present in the mixture is :
On heating KClO3 at a certain temperature, it is observed that one mole of
A charged particle formed by the loss or gain of electrons during a compound formation is called an .....
Choose the correct answer from the options given below.
Which of the following is a suitable example for illustrating the law of conservation of mass?
1.375 g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper obtained was
Of two oxides of iron, the first contained
Which of the following substance is made up of only one type of particle?
Which of the following cations does not form soluble complex with excess NaOH solution as well as excess NH4 OH solution ?
The average relative atomic mass of chlorine is 35.45. It consists of two naturally occurring isotopes chlorine-35 and chlorine-37. What is the fractional abundance of chlorine-37?
Which among the following is true about one mole of a gas?
In a chemical scale, the relative mass of the isotopic mixture of oxygen atoms
Which of the following statements is correct about the reaction given below?$$4Fe(s)+3O2(g) \rightarrow 2Fe_{2}O_{3}(g)$$
The number of gold atoms in 300 mg of a gold ring of 20-carat gold (Au=197: pure gold is 24 carat) is:
If we assume that one-sixth the mass of an atom of (\12_{C}\) isotope is taken as the reference, the mass of one molecule of oxygen will:
What is the ratio of the number of atoms of elements potassium, chlorine, and oxygen respectively present in
How many molecules are present in one gram of hydrogen \( H_{2} \)
Two gaseous samples of the same compound were analyzed. One contained 1.2 g of carbon and 3.2 g of oxygen. The other contained 27.3% carbon and 72.7% of oxygen. The experimental data follows:
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