During the reaction of some metals with dilute hydrochloric acid, following observations were made.

Monjur Alahi

During the reaction of some metals with dilute hydrochloric acid, following observations were made.
(i) The temperature of the reaction mixture rises when aluminium (Al) is added.
(ii) The reaction of sodium metal is found to be highly explosive.
(iii) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
 


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(i) The temperature of the reaction mixture rises when aluminium is added because it is an exothernic reaction.
(ii) Reaction of sodium metal is found to be highly explosive because it is an exothermic reaction.
(iii) When lead is treated with hydrochloric acid, bubbles of hydrogen gas are evolved.
Pb(s) + 2HCl(aq) ------> PbCl2(aq) + H2(g)

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.

When reactive metals react with dilute hydrochloric acids, gives a salt and hydrogen gas Metal + Dilute acid → Salt + Hydrogen Reaction between Iron and H2SO4: Fe + H2SO4 → FeSO4 +...

1 Answers 1 views
Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals

(c) either metals or non-metals 

1 Answers 1 views
Which of the following statements is correct? a. All metals are ductile. b. All non-metals are ductile. c. Generally, metals are ductile.

(c) Generally, metals are ductile. However, mercury metal - a liquid at room temperature - cannot be drawn into wires and is not ductile.

1 Answers 1 views
What happens when dilute hydrochloric acid is added to iron filings? Choose the correct

The following reaction takes place:    Fe  +      2HCl         ----->      FeCl2       +      H2 Iron     Hydrochloric acid     lron chloride   Hydrogen Thus, hydrogen and iron chloride are produced. Therefore, (a) is the correct answer.​

1 Answers 1 views
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid,whereas copper does not. Explain why?

Zinc is above hydrogen rvhereas copper is below hydrogen in the activity series of metals. That is why zinc displaces hydrogen from dilute hydrochloric acid, while copper does not.    ...

1 Answers 1 views
A metal compound A reacts with dilute hydrochloric acid to produce effervescence.

The gas that extinguishes a burning candle is carbon dioxide. It is formed by the action of dilute hydrochloric acid on a metal carbonate or metal hydrogen carbonate and produces...

1 Answers 1 views
During extraction of metals, electrolytic refining is used to obtain pure metals.

(i) Anode: Impure silver Cathode: Pure silver (ii) Electrolyte: Silver salt, such as AgNO3, AgCl, etc. (iii) We get pure silver at cathode.

1 Answers 1 views
During the experiment of heating of ferrous sulphate crystals, four students recorded their observations as:observations as:

(B) (i), (iv)

1 Answers 1 views
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why,

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid because zinc is more reactive than hydrogen. However, copper does not liberate hydrogen gas when reacted with dilute hydrochloric acid...

1 Answers 1 views
Explain the following observations: (i) The enthalpies of atomisation of transition metals are quite high.

(i) This is because transition metals have strong metallic bonds as they have large number of unpaired electrons. (ii) There is a close similarity in physical and chemical properties of the...

1 Answers 1 views
X