There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be :(a) P (b) Q (c) R (d) S
Correct Answer: (d) S
Explanation: Element S has electronic configuration 2, 8, 6. It can exhibit covalency as well as electrovalency.
Related Articles
- Elements P, Q, R and S have atomic numbers 11, 15, 17 and 18 respectively. Which of them are reactive non-metals?
- The focal lengths of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having greatest power is :(a) P (b) Q (c) R (d) S
- A student measured the pH values of four solutions P, Q, R and S as 10, 6, 0 and 12 respectively. The solution which is the most acidic is likely to be the solution :(1) P (2) Q (3) R (4) S
- The refractive indices of four substance $P,\ Q,\ R$ and $S$ are $1.50,\ 1.36,\ 1.77$ and $1.31$ respectively. The speed of light is the maximum in the substance:(a) P (b) Q (c) R (d) S
- The figure formed by joining the mid-points of the sides of a quadrilateral $PQRS$ taken in order is a square if and only if,(a) $P Q R S$ is a rhombus.(b) diagonals of $P Q R S$ are perpendicular.(c) diagonals of $P Q R S$ are equal and perpendicular.(d) diagonals of $P Q R S$ are equal.
- If $a = xy^{p-1}, b = xy^{q-1}$ and $c = xy^{r-1}$, prove that $a^{q-r} b^{r-p} c^{p-q} = 1$.
- The refractive indexes of four substances $P,\ Q,\ R$ and $S$ are $1.77,\ 1.50,\ 2.42$ and $1.31$ respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in:(a) substance P (b) substance Q (c) substance R (d) substance S
- The points P, Q, R, S, T, U, A and B on the number line are such that, $TR = RS = SU$ and $AP = PQ = QB$. Name the rational numbers represented by P, Q, R, and S."
- If p,q and r are in proportion and q =17, r=289, find p.
- The relative densities of four liquids P, Q, R and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is floated in all these liquids, one by one. In which liquid the object will float with its maximum volume submerged under the liquid?(a) P(b) Q(c) R(d) S
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies