Download App

Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations5 Marks
Question
A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wire and alloys like brass.
  1. What do you think metal X could be?
  2. Write the name, formula and colour of salt XSO4.
  3. What is the blue precipitate Y?
  4. Write a chemical equation of the reaction which takes place when salt XSO4 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
✓

Answer

  1. Metal X could be copper (Cu).
  2. The salt XSO4 is copper sulphate its formula is CuSO4 and it is blue in colour.
  3. Copper hydroxide [Cu(OH)2] is the blue precipitate.
  4. $\text{CuSO}_4(\text{aq})\ +\ 2\text{NaOH(aq)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Cu(OH)}_2(\text{s})\ +\ \text{Na}_2\text{SO}_4(\text{aq})$

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-5M]" from Chemical Reactions and Equations→Chemical Reactions and Equations — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses. Write chemical equation and name of the product formed when this compound reacts with-
  1. Sodium metal.
  2. Hot concentrated sulphuric acid.
→
A red-brown metal X forms a salt XSO4. When hydrogen sulphide gas is passed through an aqueous solution of XSO4, then a black precipitate of XS is formed alongwith sulphuric acid solution.
  1. What could the salt XSO4 be?
  2. What is the colour of salt XSO4?
  3. Name the black precipitate XS.
  4. By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.
  5. What type of chemical reaction takes place in this case?
→
You are given an organic compound having the molecular formula C3H8. Give the name and formula of the compound formed:
  1. When one H atom of C3H8 is replaced by a Cl atom.
  2. When one H atom of C3H8 is replaced by a OH group.
  3. When one H atom of C3H8 is replaced by a CHO group.
  4. When one H atom of C3H8 is replaced by a COOH group.
  5. When two H atoms joined to the middle carbon atom of C3H8 are replaced by one O atom.
→
Consider the following organic compounds:
CH3OH, C2H5OH, CH3COCH3, CH3COOH, C2H5COOH, C4H9COOC2H5, CH4, C2H6, CH3CHO, HCHO
Out of these compounds:
  1. Which compound is most likely to be sweet-smelling?
  2. Which compound on treatment with conc. H2SO4 at 170°C forms an alkene?
  3. Which compound on repeated chlorination forms chloroform?
  4. Which compound is added to alcohol to denature it?
  5. Which compound is a constituent of vinegar?
  6. Which compound is used to sterilise wounds and syringes?
→
State two uses each of the following compounds:
  1. Sodium hydroxide.
  2. Chlorine.
  3. Hydrogen.
  4. Hydrochloric acid.
→
State one characteristic each of the chemical reaction which takes place when:
  1. Dilute hydrochloric acid is added to sodium carbonate.
  2. Lemon juice is added gradually to potassium permanganate solution.
  3. Dilute sulphuric acid is added to barium chloride solution.
  4. Quicklime is treated with water.
  5. Wax is burned in the form of a candle.
→
Give the structural differences between saturated and unsaturated hydrocarbons with two examples, each.
→
Draw the possible isomers of the compound with molecular formula C3H6O and also give their electron dot structures.
→
No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
  1. What could the solids A and B be?
  2. What are the products C and D most likely to be?
  3. Write the chemical equation for the reaction between A and B leading to the formation of C.and D. Mention the physical sates of all the reactants and products in this equation and indicate the heat change which takes place.
  4. What is the special name of such a reaction? State one use of such a reaction.
  5. Name any two types of chemical reactions under which the above reaction can beclassified.
→
An element X forms two oxides XO and XO2. The oxide XO has no action on litmus solution but oxide XO2 turns litmus solution red.
  1. What is the nature of oxide XO?
  2. What is the nature of oxide XO2?
  3. Would you call element X a metal or a non-metal? Give reason for your choice.
  4. Can you give an example of element like X?
→