Bright light is found to emit from photographer's flashgun. This brightness is due to the presence of which one of the following noble gases?
 

Which one of the following is not a characteristic of a compound?

Which of the following substances cause temporary hardness in water?

$1. Mg{\left(HC{O}_3\right)}_2$

$2. Ca{\left(HC{O}_3\right)}_2$

$3. CaC{l}_2$

$4. MgS{O}_4$

Select the correct answer using the code given below.

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is$20$ and its mass number is $40$?

Which of the following represents a relation for 'heat lost = heat gained'?

Two metallic wires made from copper have same length but the radius of wire $1$ is half of that of wire $2$. The resistance of wire $1$ is R. If both the wires are joined together in series, the total resistance becomes-

When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is-

Match List-I with List-II and select the correct answer using the code given below the Lists:

Which one of the following is not an exclusive right of the concerned coastal nations over Exclusive Economic Zone (EEZ)?