Metals and Non-Metals — Science STD 10 — Question

Which is more acidic: a solution of pH = 2 or a solution of pH = 6?

Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion. (At. No. of S = 16)

Where, in a nuclear power station, is uranium, used up?

The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.

Out of rods and cones in the retina of your eye:Which work in dim light?

Write the molecular formula and structure of benzene.

What colour does the sky appear to an astronaut?

Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.

A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat? Explain your answer.

List two items which can be easily recycled, but we generally throw them in the dust-bins.