Carbon and its Compounds — Science STD 10 — Question

The property which is not shown by acids is:

1. They have sour taste.
2. They feel soapy.
3. They turn litmus red.
4. Their pH is less than seven.

Out of aluminium, copper, calcium and tin, the most reactive metal is:

1. Aluminium.
2. Copper.
3. Tin.
4. Calcium.

The substance which can produce brisk effervescence with baking soda solution is:

Which of the following alloys contains mercury as one of the constituents?

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by:

Which of the following alloys contains a non-metal as one of the constituents?

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

A common metal which is highly resistant to corrosion is:

1. Iron.
2. Copper.
3. Aluminium.
4. Magnesium.

A basic oxide will be formed by the element:

Out of the following oxides, the amphoteric oxide is: