MEDIUM
11th CBSE
IMPORTANT
Earn 100

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.

Important Questions on Some Basic Concepts of Chemistry

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?
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 one drop of water with 0.05 cc volume?
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 25
9.7×1017 atoms of iron weight as much as 1 cc of H2 at STP what is the atomic mass of iron?
EASY
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 1
What is the mass percent of the solute in the solution obtained by dissolving 5 g of the solute in 50 g of water?
MEDIUM
11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>PROBLEMS FOR PRACTICE>Q 2
A sample of NaOH weighing 0.40 g is dissolved in water and the solution is made to 50.0 cm3 in volumetric flask. What is the molarity of the resulting solution?