cbse class 9
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55:08
Class 9 Chemistry Ch 3 | Atoms & Molecules 16 | Ionic Compounds | Formula Unit of Ionic Compounds
cbse class 9
3 views • 2 hours ago
49:04
Class 9 Chemistry Ch 3 | Atoms & Molecules 15 | Bonding Molecules | Molecules of Compound
cbse class 9
11 views • 1 day ago
3:40
How many grams of oxygen gas contain the same number of molecules as 16 grams of sulphur dioxide
cbse class 9
2 views • 1 day ago
10:38
Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.
cbse class 9
4 views • 1 day ago
15:07
If 1 g of sulphur dioxide contains x molecules, what will be the number of molecules in 1 g of metha
cbse class 9
5 views • 1 day ago
7:02
Which contains more molecules, 4 g of methane (CH₄) or 4 g of oxygen (O₂).
cbse class 9
5 views • 1 day ago
8:06
Calculate the mass of 1 mole of each of the following : a) NaCl b) CaCO₃ c) FeSO₄ d) Na₂O₂
cbse class 9
2 views • 1 day ago
5:01
In which one of the following cases the number of hydrogen atoms is more? Two moles of HCl or One
cbse class 9
1 view • 1 day ago
3:35
The absolute mass of one molecules of a substance is 5.32×10-²³g. What is its molecular mass ? What
cbse class 9
1 view • 1 day ago
1:36
What is the number of water molecules contained in a drop of water weigh 0.06 g?
cbse class 9
2 views • 1 day ago
6:19
What is the mass of 0.5 mole of water (H₂O). (Atomic Mass :: H=1 u; O=16 u)
cbse class 9
2 views • 1 day ago
4:14
Convert 22 g of carbon dioxide (CO₂) into moles. (Atomic Masses :: C=12 u; O=16 u)
cbse class 9
3 views • 1 day ago
3:32
What is the mass of each one of the following : a) 1 mole of water b) 1 mole of ethanol c) 1 mole of
cbse class 9
4 views • 1 day ago
6:21
The mass of a single atom of an element X is 2.65×10-²³ g. What is its atomic mass? What would this
cbse class 9
No views • 1 day ago
5:19
How many grams of neon (Ne) will have the same number of atoms as 4 grams of calcium (Ca)?
cbse class 9
No views • 1 day ago
21:18
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (Given : Atomic Mass
cbse class 9
2 views • 1 day ago
12:26
If one mole of carbon atoms weights 12 grams, what is the mass (in grams) of 1 atom of carbon?
cbse class 9
4 views • 1 day ago
4:43
Calculate the number of iron atoms in a piece of iron weighing 2.8 g (Atomic Mass = 56 u).
cbse class 9
3 views • 1 day ago
4:05
How many moles are 9.033×10²⁴ atoms of helium (He)?
cbse class 9
6 views • 1 day ago
3:33
Calculate the number of atoms in 0.2 mole of sodium (Na).
cbse class 9
1 view • 1 day ago
4:52
What is the mass of 4 moles of Aluminium Atoms?
cbse class 9
2 views • 1 day ago
13:58
If 1 gram of carbon contains x atoms, what will be the number of atoms in 1 gram of magnesium ?
cbse class 9
2 views • 1 day ago
8:03
How many moles are 5 grams of calcium ? (Atomic Mass of Calcium = 40 u)
cbse class 9
1 view • 1 day ago
11:10
Calculate the molar mass of the following : a) Ethyne b) Sulphur Molecule c) Phosphorus Molecule
cbse class 9
8 views • 1 day ago
19:55
In an experiment, 1.288 g of copper oxide was obtained form 1.03 g of copper. In another experiment
cbse class 9
7 views • 1 day ago
4:02
An element Z forms an oxide ZO₃. a) What is the valency of element Z? b) What will be the formula
cbse class 9
2 views • 1 day ago
4:08
The formula of the chloride of a metal is MCl₂. What will be the formula of its sulphate.
cbse class 9
No views • 1 day ago
20:20
A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron
cbse class 9
3 views • 1 day ago
4:31
Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide. When 10 g of
cbse class 9
3 views • 1 day ago
7:57
Sodium Carbonate reacts with ethanoic acid to form sodium ethanoate, carbon dioxide and water.
cbse class 9
3 views • 1 day ago
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