Metals and Non-Metals — Science STD 10 — Question

A common metal which is highly resistant to corrosion is:

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

Which among the following alloys contain mercury as one of its constituents?

1. Stainless steel.
2. Alnico.
3. Solder.
4. Zinc amalgam.

10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be

The atomic number of carbon is:

Which of the following statements is true for acids?

1. Bitter and change red litmus to blue.
2. Sour and change red litmus to blue.
3. Sour and change blue litmus to red.
4. Bitter and change blue litmus to red.

The electronic configurations of three elements X, Y and Z are:
X : 2
Y : 2, 8, 7
Z : 2, 8, 2
Which of the following is correct regarding these elements?

1. X is a metal.
2. Y is a metal.
3. Z is a non-metal.
4. Y is a non-metal and Z is a metal.

What is the little number after an element in a chemical equation called?
Example: H₂

A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be:

1. 200
2. 198
3. 202
4. 196

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

The two metals which can be extracted just by heating their sulphides in air are: