Download App

Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts3 Marks
Question
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
  1. Predict the new compound formed which imparts a blue-green colour to solution.
  2. Write a balanced chemical equation of the reaction which takes place.
  3. On the basis of the above reaction, what can you say about the nature of copper oxide?
✓

Answer

  1. Copper (II) chloride CuCl2
  2. CuO(s) + 2HCl(aq) → CuCl2(aq) + H2O(l)
  3. Copper oxide is basic in nature

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the questions.[Che-3M]" from Acids, Bases and Salts→Acids, Bases and Salts — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Write a balanced chemical equation with state symbols for the following reactions.
  1. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
  2. Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
→
What is baking soda? Write the chemical name of baking soda. Give the important uses of baking soda. How does baking soda differ chemically from washing soda?
→
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
→
A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
  1. What is element X?
  2. Name the allotrope Y.
  3. State whether allotrope Y is a good conductor or non-conductor of electricity.
  4. Name one use of allotrope Y (other than lubrication and pencil leads)
  5. Name two other allotropes of element X.
→
Metals are said to be shiny. Why do metals generally appear to be dull ? How can their brightness be restored?
→
What is meant by homologous series of carbon compounds? Classify the following carbon compounds into two homologous series and name them.
C3H4, C3H6, C4H6, C4H8, C5H8, C5H10.
→
Balance the following chemical equations:

  1. $\text{Mg(OH)}_2+\text{HCl}\rightarrow\text{MgCl}_2+\text{H}_2\text{O}$

  2. $\text{N}_2+\text{H}_2\rightarrow\text{NH}_3$

  3. $\text{P}_4+\text{O}_2\rightarrow\text{P}_2\text{O}_5$

→
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
→
A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water.
  1. Identify the compound.
  2. Write the chemical equation for its preparation.
  3. Mention one important use of this compound.
→
Suppose you have to extract metal M from its enriched sulphide ore. If M is in the middle of the reactivity series, write various steps used in extracting this metal.
→