Advertisements
Advertisements
Question
Fill in the following blank with suitable word:
The white powder formed when magnesium ribbon burns in oxygen is of ....................
Advertisements
Solution
The white powder formed when a magnesium ribbon burns in oxygen is magnesium oxide.
APPEARS IN
RELATED QUESTIONS
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Write the electron-dot structures for sodium, oxygen and magnesium.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Differentiate between metal and non-metal on the basis of their chemical properties.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Complete and balance the following equation:
Cu (NO3)2 (aq) + Zn(s) →
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
A copper plate was dipped in AgNO3 solution. After certain time, silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
Name two metals which cannot displace hydrogen from dilute acids.
What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
Calcium floats over water during the reaction with water. Give reason.
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Why is acidified water considered to be a good conductor of electricity?
