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NEET NEET Questions — Free MCQ Practice

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Which is a true acid anhydride?

A.

$A l_{2} O_{3}$

B.

CO

C.

CaO

D.

$C O_{2}$

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Explanation

H₂CO₃ - H₂O = CO₂

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$C C l_{4}$ does not show hydrolysis but $S i C l_{4}$ is readily hydrolysed because:

A.

carbon cannot expand its octet but silicon can expand]

B.

electronegativity of carbon is higher than of silicon

C.

IP of carbon is higher than of silicon

D.

carbon forms double and triple bonds but not silicon

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Explanation

Si is having vacant d subshell , so can extent their covaleny , but carbon without vacant d subshell, cannot extent co valency

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Which is formed when $S i C l_{4}$ vapours are passed over hot Mg?

A.

$S i C l_{2} + M g C l_{2}$

B.

$S i + M g C l_{2}$

C.

$M g_{2} S i + C l_{2}$

D.

$M g S i C l_{6}$

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Explanation

The product formed is (b) Si + MgCl2

- This reaction is an oxidation - reduction reaction (or we can simply say redox reaction).

- SiCl4 is an oxidising agent whereas Mg is a reducing agent.

- Mg replaces Si from SiCl4 vapours at high temperature.

- The reaction can be denoted as follows:

SiCl4 + 2Mg → Si + 2MgCl2

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Asbestors is chemically:

A.

silicate of calcium and magnesium

B.

calcium alumino silicate

C.

magnesium alumino silicates

D.

calcium silicate + calcium aluminates

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Explanation

Asbestos, any of several minerals that readily separate into long, flexible fibres. Chrysotile, the fibrous form of the mineral serpentine, is the best-known type and accounts for about 95 percent of all asbestos in commercial use. It is a hydrous magnesium silicate with the chemical composition of Mg₃Si₂O₅(OH)₄.

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Aqueous solution of sodium silicate is:

A.

acidic

B.

alkaline

C.

neutral

D.

insoluble

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Explanation

Silicate solutions are alkaline, the pH of commercial silicate solutions ranges from approximately 10 to 13. The pH is a function of ratio and concentration and decreases with increasing silica content. The stability of a sodium silicate solution depends to a large extent on pH.

Sodium silicate is the common name for compounds with the formula $N a_{2} (S i O_{2})_{n} O$ . A well-known member of this series is sodium metasilicate, $N a_{2} S i O_{3}$ . It is also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form.

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Quartz is made of silicon and oxygen joined in a network arrangement that is similar to:

A.

diamond

B.

graphite

C.

$O_{2}$

D.

none of these

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Explanation

Diamond

silicon and oxygen forms silicon which have tetrahedral structures same as diamond's tetrahedral structure.

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The product obtained when silica reacts with hydrogen fluoride is:

A.

$S i F_{4}$

B.

$H_{2} S i F_{6}$

C.

$H_{2} S i F_{4}$

D.

$H_{2} S i F_{3}$

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Explanation

Silicon dioxide react with hydrogen fluoride to produce hydrogen hexafluorosilicate(IV) and water. Hydrogen fluoride - concentrated solution. This reaction takes place at a temperature of

SiO₂ + 6HF → H₂[SiF₆] + 2H₂O

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Silica reacts with Mg to form a magnesium compound (A). (A) react with dil. HCl and forms (B). (B) is:

A.

MgSiO

B.

MgO

C.

$M g C l_{2}$

D.

$S i C l_{4}$

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Silica is reacted with sodium carbonate. Which is the gas liberated?

A.

CO

B.

$O_{2}$

C.

$O_{3}$

D.

$C O_{2}$

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Explanation

4

When silica is mixed with solid sodium carbonate and melted, sodium silicate is formed. This reaction is the basic reaction in the manufacture of glass

S i O_{2} + N a_{2} C O_{3} âŸ¶ Na2SiO3 + CO2

Carbon-dioxide is released.

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Name of the structure of silicate in which three oxygen atoms of $[S i O$ ₄]4- are shared:

A.

pyrosilicate

B.

sheet silicate

C.

linear chain silicate

D.

three dimensional silicate

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NEET Practice Questions (MCQs) with Answers & Solutions

SiO₂ + 6HF → H₂[SiF₆] + 2H₂O

Frequently Asked Questions

NEET Practice Questions (MCQs) with Answers & Solutions

SiO2 + 6HF → H2[SiF6] + 2H2O

Frequently Asked Questions

SiO₂ + 6HF → H₂[SiF₆] + 2H₂O