MEDIUM
11th CBSE
IMPORTANT
Earn 100

How many atoms and molecules of phosphorus are present in 124 g of phosphorus (P4)?

Important Questions on Some Basic Concepts of Chemistry

MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 17
What is the mass of a water molecule in gram? How many molecules are present in one drop of pure water which weighs 0.05 g? If the same drop of water evaporates in one hour, calculate the number of molecules leaving the liquid surface per second.
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 18
What is the mass of carbon present in 0.5 mole of K4[Fe(CN)6]?
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 19
The cost of table salt (NaCl) and table sugar (C12H22O11) is Rs. 2 per kg and Rs. 6 per kg respectively. Calculate their costs per mole.
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 20
Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2.68 % of magnesium by weight. Calculate the number of magnesium atoms in 2.0 g of chlorophyll.
EASY
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 21
How many years would it take to spend Avogadro’s number of rupees at the rate of 10 lakh rupees per second?
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 22
Calculate the total number of electrons present in 1.4 g of nitrogen gas.
EASY
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 23
What is the mass in grams of one molecule of caffeine (C8H10N4O2) ?
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 24
How many molecules approximately do you expect to be present in a small sugar crystal which weights 10 mg?