The second most abundant metal in the earth’s crust is?

(a) oxygen (b) silicon (c) aluminium (d) iron

A greenish coating develops on copper utensils due to formation of

. The bronze medals are made up of

Silver articles becomes black on prolonged exposure to air. This is due to the formation of

A student placed an iron nail in copper sulphate solution. He observed the reddish brown coating on the iron nail which is

8. Al₂O₃ + 2NaOH → …… + H2O

11. Example of an amphoteric oxide is:

10. Which of tire following are not ionic compounds?

(i) KCl

(ii) HCl

(iii) CCl4

(iv) NaCl

12. An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following

Reaction between X and Y forms compound Z. X loses electron and Y gains electron.Which of the following properties is not shown by Z?

The most abundant element in the universe is

An element ‘X’ is yellow coloured solid, insoluble in water but soluble in carbon disulphide. It has low melting point 114.5°C. It boils at 445°C and it bums with pale blue flame forming pungent smelling gas ‘Y’ which turns moist blue litmus red and finally colourless. ‘X’ and ‘Y’ are

Which one of the following metals do not react with cold as well as hot water

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

An electrolytic cell consists of

(i) positively charged cathode

(ii) negatively charged anode

(iii) positively charged anode

(iv) negatively charged cathode

Which of the following can undergo a chemical reaction ?

Which metal can be displaced by copper from its salt solution?

Which of the following non-metal is lustrous?

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

What happens when calcium is treated with water?

(i) It does not react with water

(ii) It reacts violently with water

(iii) It reacts less violently with water

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

The ability of metals to be drawn into thin wire is known as

(a) Ductility

(b) Malleability

(c) Sonority

(d) Conductivity

Which is correct order as per the reactivity of the metals?

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?