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NEET Practice Questions (MCQs) with Answers & Solutions

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Lapis lazuli is

A. Ferrous sulphate B. Copper Sulphate C. Sodium Alumino Silicate D. Zinc Sulphate

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'Lead pencil' contains

A. PbS B. Graphite C. FeS D. Pb

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Explanation

Propyne can be prepared by hydrolysis of magnesium carbide. $ Mg_2C_3 + 4H_2O \rightarrow CH_3C \equiv CH + 2Mg(OH)_2 $ .

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Which of the following gives propyne on hydrolysis

A. $ Al_4 C_3 $ B. $ Mg_2 C_3 $ C. $ B_4 C $ D. $ La_4 C_3 $

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The ionic carbide is

A. ZnC B. TiC C. SiC D. $ CaC_2 $

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Explanation

Calcium carbide ($ CaC_2 $) is an ionic carbide. When it reacts with water, it produces acetylene gas. The other given compounds do not form ionic carbides. Therefore, the correct answer is $ CaC_2 $.

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Which of the following is not iso structural with $ SiCl_4 $

A. $ PO_4 ^ {3-} $ B. $ NH_4 ^ + $ C. $ S Cl_4 $ D. $ SO_4 ^ {2-} $

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Explanation

SiCl₄ (Silicon tetrachloride) has a tetrahedral structure. For a molecule or ion to be isostructural with SiCl₄, it must also have a tetrahedral geometry. PO₄^3- (Phosphate ion), NH₄⁺ (Ammonium ion), and SO₄^2- (Sulfate ion) all have tetrahedral structures. However, SCl₄ (Sulfur tetrachloride) has a seesaw shape due to the presence of one lone pair on sulfur, and thus it is not isostructural with SiCl₄.

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Diamond is harder than graphite because

A. Graphite is planar B. Diamond has free electron C. Graphite is $ sp^3$ hybridized D. None

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Explanation

In crystalline lattice of diamond, each crbon atom is linked to four other carbon atoms tetrahedrally by using sp3 - hydbrid orbitals giving rise to a rigid there dimensional network of carbon atom for this reason, diamond is very hard.Graphite, has hexagonal layer structure in which each carbon atom is linked to three other carbon atoms by using sp2 hybrid orbitals. The hexagonal layer in graphite are held together by weak Van-der waal's forces. So graphite is soft.

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Supercritical $ CO_2 $ is used as

A. Dry ice B. Fire fighting C. A Solvent for extraction of organic compound from natural sources D. A highly inert medium for carrying out various reactions.

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Explanation

Supercritical $ CO_2 $ is used as a solvent for the extraction of organic compound from their natural sources.

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Products formed on heating $ Pb(NO_3)_2 $ are

A. $ PbO, N_2, O_2 $ B. $ Pb(NO_2)_2, O_2 $ C. $ PbO, NO_2, O_2 $ D. $ Pb, N_2, O_2 $

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Explanation

$ 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2 $

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Which of the following lead oxide is 'Sindhur'

A. PbO B. $ PbO_2 $ C. $ Pb_2 O_3 $ D. $ Pb_3 O_4 $

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Explanation

Sindhur, also known as red lead, is chemically Pb₃O₄. It is a bright red or orange powder used in various applications, including paints and pigments.

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Pb reacts with dilute $ HNO_3 $ gives

A. NO B. $ NH_4 NO_3 $ C. $ N_2 O_5 $ D. $ NO_2 $

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Explanation

Pb reacts with dilute $ HNO_3 to produce NO gas 3Pb + 8HNO_3 \rightarrow 3Pb(NO_3)_2 + 2NO + 4H_2O $

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