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NEET NEET Questions — Free MCQ Practice

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Pyrosilicate ion is:

A.

${SiO}_{2}^{2 -}$

B.

${SiO}_{4}^{2 -}$

C.

${Si}_{2} O_{7}^{6 -}$

D.

${Si}_{2} O_{6}^{7 -}$

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Semi water gas is a mixture of:

A.

water gas and producer gas

B.

water gas and ${CO}_{2}$

C.

producer gas and ${CO}_{2}$

D.

producer gas and oil gas

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Explanation

Semi water gas means something like half water gas; : Semi-water gas is a mixture of water gas and producer gas made by passing a mixture of air and steam through heated coke. The heat generated when producer gas is formed keeps the temperature of the coke high enough to allow water gas to be forme

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Butter of tin is:

A.

${SnCl}_{2} \cdot 5 H_{2} O$

B.

${SnCl}_{4} \cdot 5 H_{2} O$

C.

${SnBr}_{2} \cdot 2 H_{2} O$

D.

${SnBr}_{4} \cdot 5 H_{2} O$

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Explanation

Chemically, butter of tin is ${SnCl}_{4} \cdot 5 H_{2} O$

Tin(IV) chloride, also known as tin tetrachloride or stannic chloride, is an inorganic compound with the formula SnCl4. It is a colourless hygroscopic liquid, which fumes on contact with air. It is used as a precursor to other tin compounds.

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Pewter is an alloy of:

A.

Pb and Sn

B.

Pb, Sb and Sn

C.

Pb, Bi and Sn

D.

sb, Sn and Cu,Bi,Pb

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Explanation

Pewter (/ËˆpjuËtÉ™r/) is a malleable metal alloy. It is traditionally composed of 85–99% tin,

mixed with copper, antimony, bismuth, and sometimes silver. Copper and antimony act as hardeners while lead is more common in the lower grades of pewter, which have a bluish tint. Pewter has a low melting point, around 170–230 °C (338–446 °F), depending on the exact mixture of metals.^[1]^[2] The word pewter is probably a variation of the word spelter, a term for zinc alloys (originally a colloquial name for zinc)

Pewter was used for decorative metal items and tableware in the Ancient World by the Egyptians and later the Romans,

Today, pewter is used in decorative objects, mainly collectible statuettes and figurines, game figures, aircraft and other models, (replica) coins, pendants, plated jewellery .

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Lead pipes can be used for:

A.

soft water

B.

hard water

C.

both hard and soft water

D.

none of the above

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Explanation

Hard water deposits a protective film on the inner surface of lead pipes which resists the further dissolution of Pb in water.

Lead from pipes may partially dissolve in the water flowing through. Lead may bind to carbonate, therefore lower amounts of lead dissolve in hard water. Inside the pipes, a layer of hardly soluble alkalic lead carbonate is formed. This layer functions as a protective coating for the underlying lead of the pipes.

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Ordinary glass is:

A.

sodium silicate

B.

copper silicate

C.

calcium silicate

D.

a mixture of calcium and sodium silicates with silica

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Explanation

1.

Ordinary glass is sodium silicate glass made by fusing SiO2 with sodium oxide, boron oxide and a trace amount of transition metal oxide. The transition metal oxide is added to impart colour to the glass

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Synthetic gas is a mixture of:

A.

steam and carbon monoxide

B.

carbon monoxide and nitrogen

C.

hydrogen and carbon monoxide

D.

hydrogen and methane

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Explanation

Synthesis gas is $CO + 3 H_{2}$ .

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The substance used to impart green colour to glass is:

A.

${Cu}_{2} O$

B.

$CdS$

C.

${MnO}_{2}$

D.

${Cr}_{2} O_{3}$

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Explanation

Chromium oxide imparts green colour to glass.

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Percentage of lead in lead pencil is:

A.

20

B.

zero

C.

80

D.

70

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Explanation

Lead pencils do not have lead. They contain graphite.

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Tin(IV) chloride (anhydrous) can be obtained:

A.

by action of molten tin and ${Cl}_{2}$

B.

by heating tin and conc. $HCl$ and dehydrating the product in an atmosphere of $HCl (g)$

C.

by treating tin with dil. $HCl$ and heating the product to dryness

D.

none of the above

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Explanation

$Sn (l) + 2 {Cl}_{2} (g) \overset{}{\to} {SnCl}_{4} (g)$

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