Which one of the following is a physical change? (a) Burning of coal (b) Burning of wood (c) Heating of a platinum crucible (d) Heating of potassium chlorate

Which one of the following is a physical change? (a) Burning of coal (b) Burning of wood (c) Heating of a platinum crucible (d) Heating of potassium chlorate
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Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid

Description : Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid

Last Answer : ANSWER: Z -- REACTION OF POTASSIUM HYDROXIDE WITH NITRIC ACID  

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number? (1) C (2) S (3) H (4) Cl

Description : A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number? (1) C (2) S (3) H (4) Cl

Last Answer : Cl

How many moles of O2 are produced by the decomposition if 10 moles potassium chlorate 2KClO3- and 2KCl plus 3O2?

Description : How many moles of O2 are produced by the decomposition if 10 moles potassium chlorate 2KClO3- and 2KCl plus 3O2?

Last Answer : 15 moles of O2 are produced by the decomposition if 10 moles potassium chlorate 2 KClO3 and 2 KCl plus 3O2.

Thiamin is oxidized to thiochrome in alkaline solution by (A) Potassium permanganate (B) Potassium ferricyanide (C) Potassium chlorate (D) Potassium dichromate

Description : Thiamin is oxidized to thiochrome in alkaline solution by (A) Potassium permanganate (B) Potassium ferricyanide (C) Potassium chlorate (D) Potassium dichromate

Last Answer : Answer : B

Glauber's salt is chemically (A) Calcium sulphate (B) Potassium sulphate (C) Potassium chlorate (D) None of these

Description : Glauber's salt is chemically (A) Calcium sulphate (B) Potassium sulphate (C) Potassium chlorate (D) None of these

Last Answer : (D) None of these

Oxygen has a valence number of -1 in: w) Sodium Peroxide x) Potassium Chlorate y) Water z) Sodium Hydroxide

Description : Oxygen has a valence number of -1 in: w) Sodium Peroxide x) Potassium Chlorate y) Water z) Sodium Hydroxide

Last Answer : ANSWER: W -- SODIUM PEROXIDE

The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Description : The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Last Answer : Answer: Option B

Is a physical change A.Forming a mixture B.Burning wood C.Food turning into waste in the intestines D.Turning solid sodium and chlorine gas into salt?

Description : Is a physical change A.Forming a mixture B.Burning wood C.Food turning into waste in the intestines D.Turning solid sodium and chlorine gas into salt?

Last Answer : What is the answer ?

The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning

Description : The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning

Last Answer : a) destructive distillation

Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Description : Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Last Answer : (3) Lead nitrate Explanation: Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.

Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Description : Which of the following substances undergoes chemical change on heating? (1) Sodium chloride (2) Silica (3) Lead nitrate (4) Platinum wire

Last Answer : (3) Lead nitrate Explanation: Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas.

Which of the following is the best example of law of conservation of mass? [NCERT 1975] (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2. (B) When 12 g of carbon is heated in a vacuum there is no change in mass. (C) A sample of air increases in volume when heated at constant pressure but its mass remains unaltered. (D) The weight of a piece of platinum is the same before and after heating in air.

Description : Which of the following is the best example of law of conservation of mass? [NCERT 1975] (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2. (B) When 12 g of carbon is ... mass remains unaltered. (D) The weight of a piece of platinum is the same before and after heating in air.

Last Answer : (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2.

Will wood or coal heating be cheaper?

Description : What pays off?

Last Answer : It depends a bit on what you heat and what object you heat ...: o But wood is usually cheaper, especially if you at least partially process it yourself.

Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Description : Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Last Answer : Answer: D

The EAN of platinum in potassium hexachloroplatinate (IV) is:

Description : The EAN of platinum in potassium hexachloroplatinate (IV) is:

Last Answer : The EAN of platinum in potassium hexachloroplatinate (IV) is: A. 46 B. 86 C. 36 D. 84

The EAN of platinum in potassium hexachloridoplatinate (IV) is (Atomic number of Pt=78)

Description : The EAN of platinum in potassium hexachloridoplatinate (IV) is (Atomic number of Pt=78)

Last Answer : The EAN of platinum in potassium hexachloridoplatinate (IV) is (Atomic number of Pt=78) A. 90 B. 86 C. 76 D. 88

Classify the following materials as metals and non-metals : Hydrogen, Sulphur, Selenium, Manganese, Calcium, Platinum, Gold, Silica, Polyester, Wood, Glass, Iron

Description : Classify the following materials as metals and non-metals : Hydrogen, Sulphur, Selenium, Manganese, Calcium, Platinum, Gold, Silica, Polyester, Wood, Glass, Iron 

Last Answer : Metals: calcium , manganese, platinum, gold , iron Non- metals: hydrogen, Sulphur, silica, polyester, wood, glass, selenium

The natural resource, known as black gold is – (1) coal (2) lead (3) tin (4) platinum

Description : The natural resource, known as black gold is – (1) coal (2) lead (3) tin (4) platinum

Last Answer : (1) coal Explanation: The term "coal is a black gold" is just a simple metaphor. Even today, we burn more coal than natural gas, more than nuclear, more than anything.

The natural resource, known as black gold is (1) coal (2) lead (3) tin (4) platinum

Description : The natural resource, known as black gold is (1) coal (2) lead (3) tin (4) platinum

Last Answer : coal

What is sodium chlorate heated?

Description : What is sodium chlorate heated?

Last Answer : The chemical equation is:2 NaClO3 = 2 NaCl + 3 O2

How many moles of oxygen are produced by the decomposition of six moles of patassium chlorate?

Description : How many moles of oxygen are produced by the decomposition of six moles of patassium chlorate?

Last Answer : Balanced equation: 2KClO3 --> 2KCl + 3O26 mol KClO3 = 3 x 2 mol KCl, so the number of moles O2 that can be produced by 6 mol KClO3 is:3 x 3 mol O2 = 9 mol O2.

What is the newly formed lead compound in a reaction between lead (IV) sulfate and tin (II) chlorate?

Description : What is the newly formed lead compound in a reaction between lead (IV) sulfate and tin (II) chlorate?

Last Answer : Lead sulfate is not soluble in water.

What elements are found in calcium chlorate?

Description : What elements are found in calcium chlorate?

Last Answer : The chemical formula for calcium chlorate is CaCO3, so it contains calcium (Ca), carbon (C) and oxygen (O).

What is the formula for copper (ii) chlorate?

Description : What is the formula for copper (ii) chlorate?

Last Answer : The formula for copper(II) chlorate is Cu(ClO3)2.

Magnesium per chlorate is called Anhydrone {mg (ClO4)2}

Description : Magnesium per chlorate is called Anhydrone {mg (ClO4)2}

Last Answer : Bleaching powder is obtained when cl2 is passes through. Dry Slake lime CaOCl2+H2OàCa (OH) 2+Cl2

What is the chemical name of bleaching powder? A. Calcium Hypochlorite B. Calcium Chlorate C. Calcium Chloride D. Chlorine

Description : What is the chemical name of bleaching powder? A. Calcium Hypochlorite B. Calcium Chlorate C. Calcium Chloride D. Chlorine

Last Answer : ANSWER: A

What is the chemical name of bleaching powder? A. Calcium Hypochlorite B. Calcium Chlorate C. Calcium Chloride D. Chlorine

Description : What is the chemical name of bleaching powder? A. Calcium Hypochlorite B. Calcium Chlorate C. Calcium Chloride D. Chlorine

Last Answer : ANSWER: A

Molybdenum deficiency affects the activity of – (1) All of the given options (2) Chlorate reductase (3) Nitrogenase (4) Nitrate reductase

Description : Molybdenum deficiency affects the activity of – (1) All of the given options (2) Chlorate reductase (3) Nitrogenase (4) Nitrate reductase

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Chemical name of bleaching powder is (1) Calcium chlorate (2) Calcium hypochlorite (3) Calcium chloro hypochlorite (4) Calcium bi chloride

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The chemical name for common salt - (1) Sodium chloride (2) Sodium hydroxide (3) Sodium chlorate (4) Potasium chloride

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Last Answer : (1) Sodium chloride Explanation: Sodium chloride is also known common salt is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.

Commonly used electro-optic crystal for polarization modulation ∙ a. Lithium Niobate ∙ b. Tourmaline ∙ c. Sodium Chlorate ∙ d. Sphalerite

Description : Commonly used electro-optic crystal for polarization modulation ∙ a. Lithium Niobate ∙ b. Tourmaline ∙ c. Sodium Chlorate ∙ d. Sphalerite

Last Answer : a. Lithium Niobate

Microbial breakdown of phenoxy herbicides such as 2,4-D and MCPA is enhanced by addition of a). Nitrate b). Sulphate c). Phosphate d). Chlorate

Description : Microbial breakdown of phenoxy herbicides such as 2,4-D and MCPA is enhanced by addition of a). Nitrate b). Sulphate c). Phosphate d). Chlorate

Last Answer : c). Phosphate

Molybdenum deficiency affects the activity of : (1) All of the given options (2) Chlorate reductase (3) Nitrogenase (4) Nitrate reductase

Description : Molybdenum deficiency affects the activity of : (1) All of the given options (2) Chlorate reductase (3) Nitrogenase (4) Nitrate reductase

Last Answer :  Nitrate reductase

Chemical name of bleaching powder is : (1) Calcium chlorate (2) Calcium hypochlorite (3) Calcium chloro hypochlorite (4) Calcium bi chloride

Description : Chemical name of bleaching powder is : (1) Calcium chlorate (2) Calcium hypochlorite (3) Calcium chloro hypochlorite (4) Calcium bi chloride

Last Answer : Calcium hypochlorite

How much would it cost to start a small crucible or foundry and a permit In Red Deer?

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Who says we danced... I can make you all wish you had never seen the sun go down in the crucible?

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In the crucible how were the witch hunt years a time of general revenge?

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Who were John Proctors friends In The crucible?

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In the crucible how were the witch hunt years a time of general revenge?

Description : In the crucible how were the witch hunt years a time of general revenge?

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In The Crucible characters is most clearly a round character?

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Description : Which character from the crucible best represents the common archetype of the well respected villain?

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Description : Softer variety of steel may be obtained by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth

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