Science : Ch 03 – Metals and Non-metals

Which of the subsequent oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

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?

Although metals form basic oxides, which of the subsequent metals form an amphoteric oxide?

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

1. AI
2. Au
3. Cu
4. Pt

Hydrogen gas is not evolved when a metal reacts with nitric acid because

Name a metal that have very low melting points.

Why do ionic compounds conduct electricity in molten state? Because

The Most malleable and ductile metal

Non-metal that can exist in diferent forms

Give the formula of the stable binary compound that would be formed by the combination of following pair of elements: Mg and N₂

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Al and Cl₂

Name two metals having melting point less than 310 K (37°C).

A non-metal X exists in two diferent forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

which metal is more reactive?