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4

Gold dissolves in aqua regia due to the formation of

A. chloro auric acid

B. auric chloride

C. gold nitrate

D. aurous chloride

Correct Answer :

A. chloro auric acid


Related Questions

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The non-metal which is electropositive is

A. chlorine

B. nitrogen

C. sulphur

D. hydrogen

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Which of the following is not a chemical change?

A. Rusting of iron

B. Burning of magnesium

C. Sublimation of iodine

D. Electrolysis of water

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Which of the following is used as an illuminant?

A. Gasoline

B. Benzoline

C. Kerosene

D. Petroleum ether

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Reduction involves

A. loss of electrons

B. gain of electrons

C. gain of oxygen

D. removal of hydrogen

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An example of thermo setting plastics is

A. bakelite

B. polythene

C. PVC

D. Teflon

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Rusting of iron cannot be prevented by

A. painting

B. applying alkaline phosphate

C. applying soap water

D. galvanising

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A metal which occurs 'free' in nature is

A. gold

B. zinc

C. tin

D. molybdenum

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Marble is

A. calcium carbonate

B. sodium carbonate

C. magnesium sulphate

D. ferric chloride

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Mortar contains cement and sand in the ratio of

A. 1 : 1

B. 1 : 2

C. 2 : 3

D. 1 : 3

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Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because otherwise

A. it becomes coloured

B. it gets evaporated in air

C. it gets oxidised to phosgene

D. it gets decomposed to chloropicrin

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A burning substance which continues to burn in a jar of carbon dioxide is

A. zinc

B. red phosphorus

C. magnesium

D. sulphur

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Which of the following is a communicable disease caused by viruses?

A. Cholera

B. Dysentery

C. Diabetes

D. Measles

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4

Cinnabar is an ore of

A. lead

B. zinc

C. mercury

D. chromium

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Argyrol used as eye ointment is a solution of

A. hydrogen peroxide

B. silver nitrate

C. tincture iodine

D. m-cresol

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The main constituent of gobar gas is

A. methane

B. nitrogen

C. carbondioxide

D. ethylene

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On chemical analysis, a bottle cork is found to contain primarily

A. proteins

B. carbohydrates

C. tannins

D. lipids

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The alloy added in the preparation of steel contains

A. Fe and C

B. Mn and C

C. Fe and Mn

D. Fe, Mn and C

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Gold dissolves in aqua regia due to the formation of

A. chloro auric acid

B. auric chloride

C. gold nitrate

D. aurous chloride

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4

Mild steel contains

A. iron with very low percentage of carbon

B. iron with high percentage of carbon

C. iron and chromium

D. iron and manganese

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Which of the following is not a supporter of combustion?

A. Oxygen

B. Air

C. Hydrogen

D. Chlorine

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High temperature thermometers use

A. sodium amalgam

B. an alloy of sodium and potassium

C. silver amalgam

D. calcium amalgam

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The freezing point of water at 760 mm pressure is

A. 273 K

B. 0 K

C. 273°C

D. -273°C

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Soda-water contains

A. sodium bicarbonate

B. sodium carbonate

C. carbonic acid

D. sodium hydroxide

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The science which deals with the chemistry of life processes is known as

A. electrochemistry

B. physical chemistry

C. biochemistry

D. tinctorial chemistry

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The formula for cane sugar is

A. C6H12O6

B. C2H5OH

C. C12H22O11

D. C7H8O

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Artificial diamonds were produced by

A. Moissan

B. Davy

C. Faraday

D. Marie Curie

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The simplest hydrocarbon is

A. benzene

B. methane

C. ethane

D. butane

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Diamonds are weighed in

A. grams

B. pounds

C. carats

D. tons

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Dry Ice is

A. solid carbon dioxide

B. liquid oxygen

C. liquid hydrogen

D. liquid. Chlorine

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The most abundant noble gas present in air is

A. neon

B. argon

C. helium

D. krypton