When some liquid evaporates, the average speed of the molecules remaining will ____.
(A) Increase because the more energetic molecules have left
(B) Decrease because the more energetic molecules have left
(C) Remain unchanged because all molecules have about the same speed
(D) Increase because there are fewer molecules
What will be the weight of object X on Moon if it weighs 36 kg on Earth?
PLEASE MAKE ME UNDERSTAND WHY
An element X has the 4th shell as the valence shell. If the difference in the number of electrons between K and N shells and between L and M shells is zero, then the atomic number of the element X will be
it would be (d) because if 4 shells are present in an atom then rest of the answers don't make sense !!!!
Which of the following statements are correct?
1. Vitamin A helps to make our bones and teeth strong.
2. Iron helps in the formation of blood.
3. Potassium is present in sprouts and bananas.
4. Vitamin D helps in wound healing and found in whole grains.
A 1 and 3 only
B 2 and 3 only
C 3 and 4 only
D 2 and 4 only