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NEET NEET Questions — Free MCQ Practice

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Quartz is an example of:

A.

chain silicate

B.

sheet silicate

C.

cyclic silicate

D.

three dimensional network silicate

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Explanation

Quartz is an example of a three-dimensional network silicate. In quartz, each silicon atom is covalently bonded to four oxygen atoms, and each oxygen atom is shared between two silicon atoms, forming a continuous three-dimensional network structure. This type of structure is characteristic of network silicates.

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The products of the following reaction are;

$S i O_{2} + C \overset{∆}{\to}$

A.

SiC and $C O_{2}$

B.

$S i O a n d C O$

C.

SiC and CO

D.

Si and $C O_{2}$

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Explanation

3.

Silicon dioxide reacting with carbon. the carbon and the oxygen (in the silicon dioxide) join together to form carbon dioxide and silicon on its own.
Its called a displacement reaction because carbon is more reactive then silicon. The oxygen would join to the most reactive substance, which is carbon.

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Which of the following shows bonding in silicone?

A.

$S i - C - S i - O - S i$

B.

$S i - C - S i - C - S i$

C.

$l l l - S i - O - S i - O - S i -$

D.

$S i - S i - S i - S i$

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Explanation

The correct answer is 3rd as Silicone is a polymer Silicon and Oxygen

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$R_{3} S i C l$ on hydrolysis forms:

A.

$R_{3} S i O H$

B.

$R_{3} S i - O - S i R_{3}$

C.

$R_{2} S i = O$

D.

None of these

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Explanation

The hydrolysis of R3SiCl (trialkyl chlorosilane) results in the formation of a siloxane linkage (-Si-O-Si-), where two silyl groups are bridged by an oxygen atom. This reaction produces R3Si-O-SiR3 as the product.

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The basic reaction involved in the synthesis of linear silicones is:

A.

the hydrolysis of trimethyl chlorosilane

B.

the hydrolysis of dimethyl dichlorosilane

C.

the hydrolysis of ethyl chlorosilane

D.

the acid hydrolysis of dimethyl silane

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Explanation

The hydrolysis of dimethyl dichlorosilane, (CH3)2SiCl2, followed by condensation polymerization is the basic reaction involved in the synthesis of linear silicones. The chlorine atoms are replaced by hydroxyl groups, which then condense to form Si-O-Si linkages.

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Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:

A.

$R_{4} S i$

B.

$R S i C l_{3}$

C.

$R_{2} S i C l_{2}$

D.

$R_{3} S i C l$

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Explanation

Trichlorosilane is the basic ingredient used in the production of purified cross linked silicon polymer. In water, it rapidly decomposes to produce a silicone polymer while giving off hydrochloric acid.

R S i C l_{3} + H_{2} O \to R S i (O H)_{3} + H C l

Linear and cyclic silicones are produced by the reaction of water with organochlorosilanes of the general formula,

R_{2} S i C l_{2}

followed by a polymerization reaction that occurs by the elimination of a molecule of water from two hydroxyl groups of adjacent

R_{2} S i (O H)_{2}

molecules.

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The most commonly used reducing agent is:

A.

$S n C l_{4}$

B.

HF

C.

$S n C l_{2}$

D.

$C l_{2}$

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Explanation

Most commonly used reducing agent is SnCl2

•Sn represents tin. In SnCl2, Sn has a +2 oxidation state. The stable oxidation state of Sn is +4.

•Thus, it can easily lose an electron to reach a stable form. Hence, it is the best reducing agent and commonly used.

•The reduction is the gain of electrons, while oxidation is the loss of electrons.

•Reducing agents oxidise themselves, and reduce other elements.

•In third option Sn is in a most stable form, thus it won't lose an electron. Aluminium and lead too are in their stable forms.

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Tin plague is the:

A.

conversion of stannous to stannic

B.

conversion of white tin to grey tin

C.

emission of sound while bending a tin rod

D.

atmospheric oxidation of tin

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Explanation

The plague of tin is the conversion of white tin to grey tin. It's an autocatalytic, allotropic transformation of the element tin, which causes deterioration of tin objects at low temperatures

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When chlorine is passed through molten tin, the product obtained is:

A.

$S n C l_{2}$

B.

$[S b C l$ ₄]2-

C.

${[S n C l_{6}]}^{2 -}$

D.

$S n C l_{4}$

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Explanation

(D)

When chlorine is passed through molten tin, the product obtained is:

Tin(IV) chloride

Tin(IV) chloride, also known as tin tetrachloride or stannic chloride, is an inorganic compound with the formula SnClâ‚„. 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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Iodine is decolourised by:

A.

$Z n C l_{2}$

B.

$H g C l_{2}$

C.

$S n C l_{2}$

D.

$A l C l_{3}$

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Explanation

(C)

$S n C l_{2} + d r o p b y d r o p I_{2} \underset{}{\to} D e c o l o r i z a t i o n o f I o d i n e S n C l_{2} I_{2}$

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