Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

Which of the following gases is not generated in a biogas plant?

If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:

Which of the following is a reductible fraction?

If 3x^2 + ax + 4 is perectly divisible by x - 5, then the value of a is :

Who among the following laid the foundation of chemical sciences by establishing two important laws of chemical combination?

Consider the given statements as true and decide which of the given conclusions can definitely be drawn from the given statements.

Statements :
Politicians marry only beautiful girls. X is beautiful.

Conclusions :
1. X will marry a politician.
2. X won't marry a politician.

Choose the correct water image of the problem figure.