Advertisements
Advertisements
प्रश्न
In what form does oxygen gas occur in nature ?
Advertisements
उत्तर
Naturally, oxygen has diatomic molecules. Two oxygen atoms chemically combine with each other to give a molecule of O2.
APPEARS IN
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
CaCO3
State the term.
The number of atoms present in a molecule of an element _________
Define: Atomic weight :
What do the following denote ?
- N
- 2N
- N2
- 2N2
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
- What is (i) solid P (ii) gas Q, and (iii) solid R.
- What is the total mass of Q and R obtained from 50 g of P ?
- How does the total mass of Q and R formed compare with the mass of P taken ?
- What conclusion do you get from the comparison of masses of products and reactant ?
- Which law of chemical combination is illustrated by the example given in this problem ?
The cation of an element has :
An element X forms the following compounds with hydrogen, carbon and oxygen :
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated by these compounds.
Calculate the mass of 3.011 × 1024 atoms of carbon.
State the atomicity of the following:
Neon
Which of the following is a short and scientific way of representing one molecule of an element or compound?
