Download App

Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
What type of oxide would Eka $-$ aluminium form?
  • A
    $\mathrm{EO}_3$
  • B
    $\mathrm{E}_3 \mathrm{O}_2$
  • ✓
    $\mathrm{E}_2 \mathrm{O}_3$
  • D
    $\ce{EO}$
✓

Answer

Correct option: C.
$\mathrm{E}_2 \mathrm{O}_3$
Eka $-$ Aluminium $(E)$ forms oxide with the same chemical formula as Aluminium oxide.
Thus, the formula can be represented as $\mathrm{E}_2 \mathrm{O}_3$​.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q" from Periodic Classification of Elements→Periodic Classification of Elements — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

The speed of light in air is :
→
The property which is not shown by acids is:
→
The name of the compound $\text{CH}_3-\text{CH}_2-\text{CHO}$ is :
→
Cornea is a transparent spherical structure which :
→
Pancreatic juice contains enzymes which digest:
→
A student has obtained an image of a distant object on a screen to determine the focal length $\mathrm{F}_1$ of the given lens. His teacher after checking the image, gave him another lens of focal length $\mathrm{F}_2$ and asked to focus the same object on the same screen. The student found that to obtain a sharp image he has to move the lens away from the screen. From this finding we may conclude that both the lenses given to the student were :
→
Select the incorrect statement:
→
Which of the following statements are true for flowers?
  1. Flowers are always bisexual.
  2. They contain sexual reproductive organs.
  3. They are produced in all groups of plants.
  4. After fertilisation they give rise to fruits.
→
Which of the following statements are true?
  1. Sudden action in response to something in the environment is called reflex action.
  2. Sensory neurons carry electrical signals from spinal cord to muscles in a reflex action.
  3. Motor neurons carry signals from receptors to spinal cord in a reflex action.
  4. The pathway of transmitting signals from a receptor to a muscle is a reflex action.
→
The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is :
→