MCQ
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
(a) Sonorous
(b) Malleability
(c) Ductility
(d) Conductivity
Sonorous
Name two metals which are soft enough to be cut.
Potassium and sodium
WHY SODIUM AND POTASSIUM KEPT IN KEROSCENE
potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil
Which of the following non-metal is lustrous?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) Iodine
Iodine
Which non-metal does conduct heat and electricity?
Graphite
why calcium start floating in water after it react with water
Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal
Example of an amphoteric oxide is:
(a) Na2O
(b) K2O
(C) Al2O3
(d) MgO
C) Al2O3
Name the property due to which metals can be drawn into wires.
Ductility
why does noble gas showing little reactivity?
noble gases, which have a completely filled valence shell, show little chemical activity
Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
(d) Sodium > Magnesium > Zinc > Iron
Which metal is used for wrapping food items?
Aluminium
why doed Hydrogen gas is not evolved when a metal reacts with nitric acid.
because HNO3 is a strong oxidising agent.
Which of the following pairs will give dis-placement reactions?
(a) FeSO4 solution and Copper metal
(b) AgNO3 solution and Copper metal
(c) CuSO4 solution and Silver metal
(d) NaCl solution and Copper metal
(b) AgNO3 solution and Copper metal
Whose oxides are basic in nature: Metal or non-metal?
Metal
Why do ionic compounds have high melting points?
Ionic compounds have high melting and boiling points This is because a considerable amount of energy is required to break the strong inter-ionic attraction