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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

Correct Answer :

C. magnesium


Related Questions

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The sugar which is used in silvering mirrors is

A. sucrose

B. maltose

C. glucose

D. fructose

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In surgical operation, the anaesthetic commonly used nowadays is

A. iodoform

B. chloroform

C. nitrous oxide-ether mixture

D. chloroform-nitrous oxide mixture

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Which of the following carbon compounds is used as a fire extinguisher?

A. Carbon disulphide

B. Chloroform

C. Carbon tetrachloride

D. Methylene chloride

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The gas used in balloons in the place of hydrogen is

A. nitrogen

B. helium

C. neon

D. argon

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A metal which is extracted by thermal reduction is

A. nickel

B. aluminium

C. mercury

D. calcium

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________ is left behind after distillation of petroleum.

A. Arsenic

B. Barium

C. Benzene

D. Bitumen

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Washing soda is

A. sodium hydroxide

B. sodium carbonate

C. sodium bicarbonate

D. potassium chloride

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Lead soaps are used in

A. shaving creams

B. adhesive tapes

C. toilet powders

D. lubricants

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Which among the following is a metalloid?

A. Tin

B. Silver

C. Iodine

D. Arsenic

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The flux added in the blast furnace is

A. Limestone

B. FeO

C. SiO2

D. MgO

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Petroleum ether is also known as

A. kerosene

B. naphtha

C. lubricating oil

D. asphalt

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Burglar proof safes are made of

A. Tungsten steel

B. Manganese steel

C. Chromium steel

D. Nickel steel

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The main constituent of gobar gas is

A. methane

B. nitrogen

C. carbondioxide

D. ethylene

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The value of Avogadro Number is

A. 6.023 x 1022

B. 1 x 10-14

C. cl 6.056 x 10-6

D. 6.023 x 1023

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Calamine is a ore of

A. tine

B. magnesium

C. zinc

D. copper

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The first organic compound prepared in the laboratory was

A. acetic acid

B. chloroform

C. urea

D. methane

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Glass is a ______ mixture of metallic ______.

A. homogeneous, sulphates

B. heterogeneous, nitrates

C. heterogeneous, carbonates

D. homogeneous, silicates

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The Long Form of the Periodic Table is based on

A. atomic number

B. valency

C. atomic mass

D. atomic radius

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The substance most abundantly found in sea water is

A. magnesium chloride

B. sodium chloride

C. calcium sulphate

D. potassium chloride

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A form of carbon which is a good lubricant is

A. diamond

B. coke

C. graphite

D. charcoal

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Nitrous oxide used as anaesthetic is usually mixed with

A. ethyl alcohol

B. chloroform

C. oxygen

D. methyl alcohol

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What is 'oxygen mixture'?

A. A mixture of potassium nitrate and carbon

B. A mixture of ammonium chloride and sodium nitrate

C. A mixture of potassium chlorate and manganese dioxide

D. A mixture of ammonium nitrate and charcoal

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The atomic number of an element represents

A. number of neutrons in the nucleus

B. number of protons and neutrons in the nucleus

C. the valency of the element

D. number of protons in the nucleus

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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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The compounds produced by plants in the process of photosynthesis are

A. carbohydrates

B. proteins

C. salts

D. fats

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Hard water does not lather well with soap because

A. it contains carbonates of calcium and magnesium

B. it contains sodium chloride

C. it is highly coloured

D. it contains suspended impurities

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4

Invert sugar is

A. sucrose

B. glucose

C. fructose

D. a mixture of glucose and fructose

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Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?

A. Silicon

B. Oxygen

C. Carbon

D. Calcium

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Alum is used

A. as an analgesic

B. in the purification of water

C. as a fertilizer

D. as a disinfectant

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Colour blindness is

A. a congenital disease

B. a communicable disease

C. an acquired disease

D. a contagious disease