MCQ
The elements $\ce{A, B, C, D}$ and $E$ have atomic number $9, 11, 17, 12$ and $13$ respectively. Which pair of elements belong to the same group?
- A$A$ and $B.$
- B$B$ and $D$.
- ✓$A$ and $C.$
- D$D$ and $E.$
✓
Answer
Correct option: C.
$A$ and $C.$
Elements $A(Z = 9)$ and $C(Z = 17)$ belong to the same group. It is a halogen family $($group $17).$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A 10mm long awl pin is placed vertically in front of a concave mirror. A 5mm long image of the awl pin is formed at 30cm in front of the mirror. The focal length of this mirror is:
The copper articles turn green when kept for long due to
Which of the following describes a food chain?
The daffodil plants grow best in a soil having a $\ce{pH}$ range of $6.0$ to $6.5.$ If the soil in a garden has a $\ce{pH}$ of $4.5, $ which substance needs to be added to the soil in order to grow daffodils?
→The palisade cells of a species of plant contain $28$ chromosomes. How many chromosomes will there be in each gamete produced by the plant?
→Trophic levels are formed by :
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
Characters transmitted from parents to offspring are present in:
Which of the following salts does not contain water of crystallisation?
One of the following gives the correct sequence of the components in a reflex arc. This is :