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NEET Practice Questions (MCQs) with Answers & Solutions

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Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards To the tin buttons of their uniforms. white metallic tin buttons got converted to grey powder. This Transformation is related to

A. A change in the partial pressure of oxygen in the air B. A change in the crystalline structure of tin C. An interaction with nitrogen of air at very low to temperatures D. An interaction with water vapour contained in the humid air.

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Explanation

Grey tin is very brittle & easily crumbles down to a powder in very cold climates $ Grey Tin \rightleftharpoons White Tin $ (Cubic) (Tetragonal) The change of white tin to grey is accompanied by increase in volume. This is called disease or tin Plague.

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Which one of the following statements about the zeolites is false

A. Zeolites are aluminosilicates having 3D network B. Some of the $ SiO_4^{4â€“} units are replaced by AlO_4^{5â€“} and AlO_6^{9â€“} $ ions in zeolites C. They are used as cation exchangers D. They have open structure which enables them to take up small molecules.

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Explanation

Zeolite have $ SiO_4 \& AlO_4 $ tetrahadrones linked together in a three dimensional open structure in which four or six member ring predominate. Due to open chain structure they have cavities & can take up water & other small molecules.

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Which of the following acts UV rays

A. Soda glass B. Crook's glass C. Pyrex D. None

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Explanation

Crook's glass is a special type of glass containain cerium oxide. It does not allow the passage of ultraviolate rays & is used for making lense.

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The Stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

A. $ Gex_2 \lt SiX_2 \lt SnX_2 \lt PbX_2 $ B. $ SiX_2 \lt Gex_2 \lt PbX_2 \lt SnX_2 $ C. $ SiX_2 \lt GeX_2 \lt SnX_2 \lt PbX_2 $ D. $ PbX_2 \lt SnX_2 \lt Gex_2 \lt SiX_2 $

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Explanation

Due to inert pair effect, stability of +2 oxidation state increases as we move down this group $ SiX_2 \lt GeX_2 \lt SnX_2 \lt PbX_2 $

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Sodium oxalate on heating with conc $H_2SO_4$ gives

A. CO only B. $ CO_2 only $ C. $ CO and CO_2 $ D. $ SO_2 and SO_3 $

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Explanation

Sodium oxalate react with $ conc. H_2SO_4 to form CO \& CO_2 $ gas

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Glass reacts with HF to produce

A. $ SiF_4 $ B. $ H_2 SiF_6 $ C. $ H_2 SiO_3 $ D. $ Na_3 AlF_6 $

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Explanation

When glass, which is primarily composed of silicon dioxide ($SiO_2$), reacts with hydrofluoric acid (HF), it produces hexafluorosilicic acid ($H_2SiF_6$) along with water as a byproduct. The reaction is as follows: $SiO_2 + 6HF ightarrow H_2SiF_6 + 2H_2O$.

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Extraction of lead by reduction methods done by

A. adding more galena into reverberatory furnace B. Adding more lead sulphate in reverberatory furnace C. Adding more galena and coke into the reverberatory furnace D. Self reduction of oxide form sulphide present in the furnace.

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Which is used to produce smoke screen

A. Calcium phosphide B. Zinc sulphide C. Sodium carbonate D. Zinc phosphide

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Explanation

Calcium phosphide ( ext{Ca}_3 ext{P}_2) is used to create smoke screens. When it reacts with water, it produces phosphine gas ( ext{PH}_3) and calcium hydroxide ( ext{Ca(OH)}_2). Phosphine ignites spontaneously in air, producing dense white smoke (phosphorus pentoxide). This property makes calcium phosphide useful in naval warfare and other applications requiring smoke screens.

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In lll A group Tl (thallium) shows +1 Oxidation state while other members show +3 oxidation state. Why?

A. Presence of lone pair of electron in Tl. B. Inert pair effect C. Large Ionic redius of Tl ion D. None

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Explanation

Inert pair effect become significant for 6th & 7th period of p- block element.

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Carbon suboxide $ C_3O_2 $ has

A. Linear structure B. Bent structure C. Trigonal planar structure D. Distorted tetrahedral structure.

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Explanation

Carbon Suboxide has linear structure with C - C bond lenth equal to $ 130 A ^\circ \& C - O bond length equal to 120A ^\circ O = C = C = C = O \rightleftarrow O^- â€“ C \equiv C â€“ C \equiv O^+ $

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