Acids, Bases and Salts — Science STD 10 — Question

There are some vacant places in Mendeleev’s periodic table. In some of these places, the atomic masses are seen to be predicted. Enlist three of these predicted atomic masses along with their group and period.

Name any two defects of vision which can be corrected by using spectacles.

Give the composition of an alloy called solder. State its one property and one use.

Write the name and formula of an organic compound containing a ketone functional group.

Name two alloys of iron. What elements are present in these alloys?

Define trophic level. Draw the food chain with four trophic levels.

What was the Mendeleev’s basis for the classification of elements?

What is the name of the narrow opening between the uterus and the vagina.

Which device is used to measure p.d.?

State the impurities present in the bauxite ore.