MyClass24 logo
myclass24
YOUR CLASS. YOUR PACE.
Q&A Bank

Questions & Answers

1,371 answers across all subjects

Subject:MathematicsScienceEnglishSocial StudiesHindiPhysicsChemistryBiologyComputer Science
Class:123456789101112
GeneralClass 8CBSE

How is CuSO4 formed?

Copper sulfate forms through chemical reactions between copper-containing substances and sulfuric acid or through oxidation of copper sulfide minerals. Detailed Explanation:Common Formation Methods: Copper + Sulfuric Acid (with oxidizer): Cu + H₂SO₄ + O₂ → CuSO₄ + H₂O Copper Oxide + Sulfuric Acid: CuO + H₂SO₄ → CuSO₄ + H₂O Industrial Production: Mining and roasting copper sulfide ores Treating copper metal with hot concentrated sulfuric acid Electrolytic refining processes The pentahydrate form crystallizes when aqueous solutions cool. Important Notes: Multiple synthesis routes exist Requires copper source and sulfuric acid Industrial production uses ore processing Crystallization produces the blue pentahydrate form

GeneralClass 8CBSE

Is it copper sulfate or sulphate?

Both "copper sulfate" and "copper sulphate" are correct; the choice depends on regional English conventions. This spelling variation exists across all sulfate/sulphate compounds. United States and Canada use "sulfate," while United Kingdom, India, Australia, and many Commonwealth countries use "sulphate." Scientific journals typically accept both, though they may have style preferences. When writing, maintain consistency throughout your document.

GeneralClass 8CBSE

Is CuSO4 positive or negative?

CuSO4 as a complete compound is electrically neutral (neither positive nor negative), though it contains both positive copper ions and negative sulfate ions. Copper sulfate is an ionic compound where charges balance: Cu²⁺ carries a +2 charge (positive) SO₄²⁻ carries a -2 charge (negative) Combined: (+2) + (-2) = 0 (neutral) When dissolved in water, the compound dissociates into separate ions, but the overall solution remains electrically neutral due to equal numbers of positive and negative charges. Important Notes: The compound itself is neutral Contains positive Cu²⁺ ions Contains negative SO₄²⁻ ions Charges balance to zero in the formula

GeneralClass 8CBSE

Why is copper sulphate called?

Copper sulphate is named after its constituent elements: copper (Cu) and the sulfate ion (SO4²⁻). Chemical nomenclature follows systematic rules. The name breaks down as: Copper: The metal cation (Cu²⁺) present in the compound Sulfate: The polyatomic anion (SO₄²⁻) consisting of sulfur and oxygen The "(II)" notation specifies copper's +2 oxidation state, distinguishing it from copper(I) compounds. Historical names like "blue vitriol" come from its blue crystalline appearance, where "vitriol" was an old term for sulfate salts.

GeneralClass 8CBSE

Which is correct, sulphate or sulfate?

Both spellings are correct; "sulfate" is American English, while "sulphate" is British English. This is purely a regional spelling difference with no chemical distinction. American scientific literature uses "sulfate," while British, Australian, and Indian English prefer "sulphate." International chemistry organizations like IUPAC accept both spellings. The compound CuSO4 remains identical regardless of which spelling you choose. Important Notes: Sulfate = American English spelling Sulphate = British English spelling Both refer to the same SO4²⁻ ion Choose based on your audience or regional standards No difference in chemical meaning

GeneralClass 8CBSE

What is copper sulfate called?

Copper sulfate is known by several names including blue vitriol, bluestone, and copper(II) sulfate. The compound has various names depending on context and historical usage: Copper(II) sulfate: The systematic IUPAC name Blue vitriol: Traditional name used in older texts Bluestone: Common agricultural name Cupric sulfate: Alternative chemical name The pentahydrate form (CuSO4·5H2O) is sometimes specifically called copper sulfate pentahydrate or blue copperas. Important Notes: Multiple names for the same compound "Blue vitriol" refers to its blue crystal appearance "Copper(II)" indicates the oxidation state of copper Used interchangeably in different industries

GeneralClass 8CBSE

What is the colour of CuSO4 solution?

Copper sulfate solution displays a distinctive bright blue or blue-green color. When CuSO4 dissolves in water, it creates an intensely colored blue solution due to the presence of hydrated copper ions [Cu(H2O)6]²⁺. The color intensity varies with concentration—dilute solutions appear light blue, while concentrated solutions show deep, vibrant blue. This characteristic color makes copper sulfate easily identifiable and useful as a visual indicator in chemical reactions. Important Notes: Aqueous CuSO4 solution is bright blue Color comes from copper ions surrounded by water molecules Concentration affects color intensity Anhydrous (dry) CuSO4 appears white or grayish, turning blue when water is added

GeneralClass 8CBSE

What is the formula for Cu2+ and SO4 2-?

When copper ions (Cu2+) combine with sulfate ions (SO4²⁻), they form copper sulfate with the formula CuSO4. This is a classic ionic compound formation. The copper ion carries a +2 charge (Cu²⁺), while the sulfate ion carries a -2 charge (SO₄²⁻). Since the charges are equal and opposite, they combine in a 1:1 ratio, creating a neutral compound. The positive and negative charges balance perfectly, resulting in the stable compound CuSO4. Important Notes: Cu²⁺ (copper ion) + SO₄²⁻ (sulfate ion) = CuSO4 Charges balance: (+2) + (-2) = 0 Forms an electrically neutral ionic compound The subscript "1" is implied and not written

GeneralClass 8CBSE

Is CuSO4 a copper sulphate?

Yes, CuSO4 is the chemical formula for copper sulphate (also spelled copper sulfate), a widely used inorganic compound. CuSO4 represents copper(II) sulfate, where Cu stands for copper, S for sulfur, and O4 for four oxygen atoms. This blue crystalline compound exists in two common forms: anhydrous (without water) and hydrated (with water molecules). The most familiar form is the pentahydrate (CuSO4·5H2O), which appears as bright blue crystals. Important Notes: CuSO4 is the standard chemical notation for copper sulphate Used in agriculture, chemistry labs, and various industrial applications The compound consists of copper, sulfur, and oxygen atoms Commonly found as blue crystals in its hydrated form

ScienceClass 8CBSE

Fill in the blanks to complete the following paragraph. The name of the product formed in the reaction of sulphur and is sulphur dioxide gas. When sulphur dioxide is dissolved in , sulphurous acid is formed. The sulphurous acid turns litmus paper to Generally oxides of are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.

The name of the product formed in the reaction of sulphur and Oxygenis sulphur dioxide gas. When sulphur dioxide is dissolved in water, sulphurous acid is formed. The sulphurous acid turns bluelitmus paper to red. Generally oxides of nonmetalsare acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information. When Sulphur reacts with oxygen which gas is produced? What happen when sulphur dioxide is dissolved in water ?

ScienceClass 8CBSE

Some of the following statements are incorrect. Find the incorrect statements and correct them. (a) The property of metals by virtue of which they can be drawn into wires is called ductility. (b) Metals are good conductor of electricity but poor conductor of heat. (c) Articles made of metals produce ringing sound when struck hard. (d) Oxides of non-metals and metals are acidic in nature. (e) A less reactive metal replaces a more reactive metal from its salt solution in water.

Statement b) d) and e) are wrong statements b) Metals are good conductors of electricity as well as Oxides of non-metals are acidic in nature and oxides of metals are basic in A more reactive metal replaces a less reactive metal from its salt solution in

ScienceClass 8CBSE

Match the substances in Column A with their applications given in Column B. Column A (Substance) Column B (Application) (a) oxygen (i) for making crackers (b) copper (ii) for disinfecting water (c) sulphur (iii) all living beings inhale during breathing (d) iron (iv) for making electric wires (e) chlorine (v) for making rails

Column A (Substance) Column B (Application) (a) oxygen (iii) all living beings inhale during breathing (b) copper (iv) for making electric wires (c) sulphur (i) for making crackers (d) iron (v) for making rails (e) chlorine (ii) for disinfecting water

ScienceClass 8CBSE

A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain

Tablets are made from salts of iron hence it does not look like iron.

ScienceClass 8CBSE

If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer

If iron nail is replaced by a wooden stick bulb will not glow as wood is a bad conductor of electricity.

ScienceClass 8CBSE

Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

In beaker A, a reddish brown layer of copper will deposit on the iron nail and the blue coloured solution will become yellowish green. On the other hand, no change is observed in beaker B.

ScienceClass 8CBSE

Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.

Green coating on copper statue is the mixture of CU(OH)2 and CUCO3 which are formed due to reaction of moisture and copper.

ScienceClass 8CBSE

Which of the following metals can displace the other two metals from their salt solutions?

Zinc

ScienceClass 8CBSE

Which liquid metal is used for making thermometers?

Mercury

ScienceClass 8CBSE

Why are bells made of metals?

Metals show sonorous property hence they are used in making bells.

ScienceClass 8CBSE

Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

There will no change as displacement reaction will not take place.

12345678910