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

a. Copper (II) chloride $CuCl _2$
b. $CuO ( s )+2 HCl ( aq ) \rightarrow CuCl _2( aq )+ H _2 O$ (I)
c. 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 "[3 Mark Questions]" 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

State the differences between artery, vein and capillary.
→
3ml, of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
  1. How is $5 \%$ solution of $KMnO _4$ prepared?
  2. State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?
  3. Write chemical equation of this reaction.
→
List four points of significance of reproductive health in a society. Name any two areas related to reproductive health which have improved over the past 50 years in our country.
→
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 24 cm. The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula.
→
Distinguish between homologous organs and analogous organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a suitable reason.
→
A large coal-fired power station produces 2000MW of electrical energy. A wind turbine with 33m blades can produce 300kW.
  1. How many turbines would be needed to replace the power station?
  2. Why, in actual practice, this number of turbines could not replace the coal-fired power station?
→
Draw ray-diagrams to show the formation of images when the object is placed in front of a concave mirror (converging mirror):
  1. Between its pole and focus.
  2. Between its centre of curvature and focus Describe the nature, size and position of the image formed in each case.
→
Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel's observations giving reasons of $F_{1}$ and $F_{2}$ progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments.
→
What happens when hydrogen gas is added to copper oxide?
→
Write a displacement reaction for non-metal.
→