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

Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)
  1. Write the positions of these elements in the modern periodic table giving justification.
  2. Write the formula of the compound formed by the combination of 'X' and "Y'.
  3. Draw the electron-dot structure of the compnd formed and state the nature of the bound formed between the two elements?
→
What happens when silver chloride is exposed to sunlight? Write a chemical equation for this reaction. Also give one use of such a reaction.
→
The electronic configurations of four particles A, B, C and D are given below:
A 2, 8, 8
B 2, 8, 2
C 2, 6
D 2, 8
Which electronic configuration represents:
  1. Magnesium atom?
  2. Oxygen atom?
  3. Sodium ion?
  4. Chloride ion?
→
What is meant by isomers? Draw the structures of two isomers of butane, C4H10. Explain why we cannot have isomers of first three members of alkane series.
→
Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
→
What is washing soda? State two properties and two uses of washing soda.
→
Zinc oxide reacts with carbon, on heating to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reaction. Name
  1. Oxidising agent.
  2. The reducing agent in this reaction.
→
How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.
→
An organic compound ‘X’ on heating with cone. $\text{H}_{2}\text{SO}_{4}$ forms a compound ‘Y’ which on addition of one molecule of hydrogen in the presence of nickel forms a compound ‘Z’. One molecule of compound ‘Z’ on combustion forms two molecules $\text{CO}_{2}$ of  and three molecules of $\text{H}_{2}\text{O.}$ Identify giving reasons the compounds ‘X’, ‘Y’ and ‘Z’. Write the chemical equations for all the chemical reactions involved.
→
State one characteristic each of the chemical reaction which takes place when:
i. Dilute hydrochloric acid is added to sodium carbonate.
ii. Lemon juice is added gradually to potassium permanganate solution.
iii. Dilute sulphuric acid is added to the barium chloride solution.
iv. Quick lime is treated with water.
v. Wax is burned in the form of a candle.
→