What is the colour of copper oxide?

What is the colour of copper oxide?
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Which of the following imparts a blue colour to glass? (1) Cobalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Description : Which of the following imparts a blue colour to glass? (1) Cobalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Last Answer : (1) Cobalt oxide Explanation: The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of ... colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.

When black copper oxide placed in a beaker is treated with dilute HCl, its colour changes to......... a) Whiteb) Red c) Blue-green d) No change

Description : When black copper oxide placed in a beaker is treated with dilute HCl, its colour changes to......... a) Whiteb) Red c) Blue-green d) No change

Last Answer : c) Blue-green

Generally metallic oxides are basic and non-metallic are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red? a)sulphur dioxide b)Magnesium oxide c)iron oxide d)copper oxide

Description : Generally metallic oxides are basic and non-metallic are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red? a)sulphur dioxide b)Magnesium oxide c)iron oxide d)copper oxide

Last Answer : a)sulphur dioxide

Which of the following imparts a blue colour to glass ? (1) Cabalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Description : Which of the following imparts a blue colour to glass ? (1) Cabalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Last Answer : Cabalt oxide

Which of the following statements regarding red soils of India is/are correct? 1. The colour of the soil is-red due to ferric oxide content. 2. Red soils are rich in lime, humous and potash. 3. They are porous and have friable structure. Select the correct answer using the code given below: [(OS2011] (a) 1 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Description : Which of the following statements regarding red soils of India is/are correct? 1. The colour of the soil is-red due to ferric oxide content. 2. Red soils are rich in lime, humous and potash. 3. They are porous and have friable ... OS2011] (a) 1 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Last Answer : Ans: (b)

Adding which substance gives blue colour to glass? (1) Manganese oxide (2) Cobalt oxide (3) Chromium oxide (4) Iron oxide

Description : Adding which substance gives blue colour to glass? (1) Manganese oxide (2) Cobalt oxide (3) Chromium oxide (4) Iron oxide

Last Answer : (2) Cobalt oxide Explanation: Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.

Which of the following imparts deep blue colour to glass? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Description : Which of the following imparts deep blue colour to glass? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : (4) Nickel oxide Explanation: Glass colouring and colour marking may be obtained by addition of colouring ions, by precipitation of nanometer sized colloides (so-called striking glasses such as "ruby gold" or red "selenium ruby"), by coloured inclusions (as in milk glass and smoked glass).

Ferrous oxide gives which colour to glass?

Description : Ferrous oxide gives which colour to glass?

Last Answer : Olive green

White colour of soil is due to the presence of – a) Silica b) Iron c) Manganese oxide d) All of these

Description : White colour of soil is due to the presence of – a) Silica b) Iron c) Manganese oxide d) All of these

Last Answer : c) Manganese oxide

The commonly used colour pigment in paints, is (A) Ambers (B) Carbon black (C) Iron oxide (D) All the above

Description : The commonly used colour pigment in paints, is (A) Ambers (B) Carbon black (C) Iron oxide (D) All the above

Last Answer : Answer: Option D

In order to provide colour, hardness and strength to the cement, the ingredient used is (a) Lime (b) Solica (c) Alumina (d) Iron oxide

Description : In order to provide colour, hardness and strength to the cement, the ingredient used is (a) Lime (b) Solica (c) Alumina (d) Iron oxide

Last Answer : (d) Iron oxide

Which of the following imparts deep blue colour to glass ? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Description : Which of the following imparts deep blue colour to glass ? (1) Cobalt oxide (2) Cupric oxide (3) Ferrous oxide (4) Nickel oxide

Last Answer : Nickel oxide

What does copper oxide produce at high temperature?

Description : What does copper oxide produce at high temperature?

Last Answer : Laboratory preparation of copper oxide:copper salt such as CuSO4 reacts with alkali (NaOH) to generate Cu(OH)2, and then Cu(OH)2 is decomposed by heating to prepare CuO. CuSO4+2NaOH= ... by heating metallic copper in air or decomposing copper hydroxide, copper nitrate, basic copper carbonate, etc.

What colors are copper oxide and copper respectively?

Description : What colors are copper oxide and copper respectively?

Last Answer : The color of copper oxide is black, and the color of copper is purple.Copper(II) oxide (chemical formula CuO) is a black oxide of copper, which is slightlyBoth sexes, slightly hygroscopic. The relative ... Cu, English copper, atomic number29 Pure copper is a soft metal. When the surface is just c

Why Copper Oxide Is Not Alkali ?

Description : Why Copper Oxide Is Not Alkali ?

Last Answer : Substances that soothe the acid and destroy its characteristic properties are therefore alkaline. Alkalis are those substances which dissolve in water. Copper oxide only soothes the acid and eliminates its characteristic ... , but it does not dissolve in water. So copper oxide is not an alkali.

(A) Auto reduction of ore is used for the extraction of copper (R ) The sulphide ore of copper reacts with its oxide to the give the metal

Description : (A) Auto reduction of ore is used for the extraction of copper (R ) The sulphide ore of copper reacts with its oxide to the give the metal

Last Answer : (A) Auto reduction of ore is used for the extraction of copper (R ) The sulphide ore of copper reacts ... . If (A) is incorrect but (R ) is correct

What among following is used to produce artificial rain? (1) Copper oxide (2) carbon monoxide (3) silver iodide (4) silver nitrate

Description : What among following is used to produce artificial rain? (1) Copper oxide (2) carbon monoxide (3) silver iodide (4) silver nitrate

Last Answer : (3) silver iodide Explanation: Artificial process of making rain is done by precipitation, a process of condensation of water vapors in the air. This is done by using cloud seeding chemicals like potassium iodide, silver iodide, liquid propane or solid carbon dioxide (dry ice).

What among following is used to produce artificial rain? (1) copper oxide (2) carbon monoxide (3) silver iodide (4) silver nitrate

Description : What among following is used to produce artificial rain? (1) copper oxide (2) carbon monoxide (3) silver iodide (4) silver nitrate

Last Answer : (3) silver iodide Explanation: Artificial rain is produced by spraying clouds with substances like Silver Iodide (costly) or cheaper ones like solid carbon dioxide (dry ice) or even finely powdered Sodium Chloride.

An important factor in reducing D.C. motor commutator wear is _______________. A. keeping the ambient humidity as low as possible B. ensuring a very low brush current density C. establishing the copper oxide surface film D. all of the above

Description : An important factor in reducing D.C. motor commutator wear is _______________. A. keeping the ambient humidity as low as possible B. ensuring a very low brush current density C. establishing the copper oxide surface film D. all of the above

Last Answer : Answer: C

What happens when? a) A cleaned iron plate or iron nail is kept in 10g of copper sulphate solution. b) A pinch of mercuric oxide is kept in a test tube. c)A small crystal of silver nitrate is dissolved in distilled water and a drop of ammonium hydroxide & a pinch of glucose powder are added.

Description : What happens when? a) A cleaned iron plate or iron nail is kept in 10g of copper sulphate solution. b) A pinch of mercuric oxide is kept in a test tube. c)A small crystal of silver nitrate is dissolved in distilled water and a drop of ammonium hydroxide & a pinch of glucose powder are added.

Last Answer : a) A cleaned iron plate or iron nail is kept in 10g of copper sulphate solution. After a few hours a coating of copper is seen on iron nail/plate. It is based on displacement reaction. ... on the inner walls of the test tube. Aldehyde group in glucose reduced silver nitrate to metallic silver.

Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric acid) 7. Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3

Themit consists of a finely divided mixture of iron oxide and copper. a) True b) False

Description : Themit consists of a finely divided mixture of iron oxide and copper. a) True b) False

Last Answer : b) False

The substance X is an oxide of: (a) copper (b) carbon (c) calcium (d) none of the above

Description : The substance X is an oxide of: (a) copper (b) carbon (c) calcium (d) none of the above

Last Answer : (c) calcium

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: (a) Copper granules (b) Magnesium ribbon (c) Sodium pellets (d) Aluminum dust

Description : The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: (a) Copper granules (b) Magnesium ribbon (c) Sodium pellets (d) Aluminum dust

Last Answer : (d) Aluminum dust

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass. (A) Chromium (B) Arsenic (C) Copper (D) Manganese

Description : Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass. (A) Chromium (B) Arsenic (C) Copper (D) Manganese

Last Answer : (C) Copper

Which of the following materials does not form adherent oxide film on surface? (A) Copper (B) Nickel (C) Aluminium (D) Gold & silver

Description : Which of the following materials does not form adherent oxide film on surface? (A) Copper (B) Nickel (C) Aluminium (D) Gold & silver

Last Answer : (D) Gold & silver

Which metal does not undergo corrosion due to the formation of oxide layer? (1) Copper (2) Iron (3) Aluminium (4) Zinc

Description : Which metal does not undergo corrosion due to the formation of oxide layer? (1) Copper (2) Iron (3) Aluminium (4) Zinc

Last Answer : Aluminium

An iron nail is dipped in the solution of copper sulphate for about 30 minutes. State the change in colour observed. Give reason for the change. -Chemistry-10

Description : An iron nail is dipped in the solution of copper sulphate for about 30 minutes. State the change in colour observed. Give reason for the change. -Chemistry-10

Last Answer : When an iron nail is dipped in copper sulphate solution, the displacement reaction takes place. The colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? -Chemistry-10

Description : Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? -Chemistry-10

Last Answer : When an iron nail is dipped in copper sulphate solution, the displacement reaction takes place. The colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Write two observations. -Chemistry

Description : Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Write two observations. -Chemistry

Last Answer : Answer. It is because displacement reaction takes place. Iron displaces copper from copper sulphate solution and forms pale green coloured solution of FeS04 and reddish brown copper metal gets deposited. Fe(s) + CuS04(aq) ——–> FeS04(aq) + Cu(s)

10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) Copper coin is kept immersed in silver nitrate solution for some time. What change will take place in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry

Description : 10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) ... in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry

Last Answer : (a) Carbonate ore: (i) Calcination: Carbonate ore is heated in limited supply of air and oxide is obtained, e.g. (b) Copper, being more reactive than silver will displace silver from silver nitrate ... and there will be deposition of silver on copper coin. The colour of solution will turn to blue.

What is the colour of copper sulphate?

Description : What is the colour of copper sulphate?

Last Answer : Blue

Above image shows an experiment where copper sulphate crystals are heated. When we heat the crystals, they turn white. If you moisten the crystals again with water you will find that colour of crystals reappears . (1) How many water molecules are present in one formula unit of copper sulphate (a)5 (b)2 (c)6 (d)7

Description : Above image shows an experiment where copper sulphate crystals are heated. When we heat the crystals, they turn white. If you moisten the crystals again with water you will find that colour of crystals reappears . (1 ... are present in one formula unit of copper sulphate (a)5 (b)2 (c)6 (d)7

Last Answer : (a)5