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NEET Practice Questions (MCQs) with Answers & Solutions

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Which of the following is not correct for workfunction of $ Na^+ $ ions in human body ?

A. An important role in nerve signal transmission. B. Control of flow of water between cell membrane. C. For transport of sugar and amino acid in cell. D. They activate the enzyme.

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Which of the following statements is/are correct for â€œwhen alkali metals are dissolved in liquid ammonia. We get...â€

A. A blue solution in case of dilute alkali metal ammonia solution. B. If we increase cocentration of metal in ammonia then the blue colour starts changing and finally changes to that of bronze colour. C. The blue colour of the solution of alkali metal in liquid ammonia is due to excitation of free ammoniated electrons to higher energy levels. D. All the above are correct.

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Which of the following pairs of elements possess diagonal relationship ?

A. Li and Mg B. Li and Al C. Na and Mg D. Cs and Ba

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Fill in the blanks with suitable option. â€œThe important ingredients of potland cement are dicalcium silicate â€˜â€˜................. â€™â€™ % , tricalcium silicate.......... % and tricalcium aluminate â€˜â€˜ ........... â€™â€™ % respectively.â€

A. 26 %, 51%, 11% B. 51%, 26%, 11% C. 11%, 51%, 26% D. 26%, 11%, 51%

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A sample of portaland cement contain $ 23 \% SiO_2, 3 \% Al_2O_3 and 2 \% Fe_2O_3 $ then what would be its silica module (n) ?

A. 3.83 B. 28 C. 21.73 D. 4.6

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Explanation

$ silica module \eta = { %SiO_2 \over %Al_2O_3 + %Fe_2O_3 } = { 23 \over 2 + 3 } = 4.6 $

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For a good quality of cement, the ratio of silica $ (SiO_2) and alumina (Al_2O_3)$ must be between...

A. 3 to 5 B. 2.5 to 4 C. 6 to 7.5 D. 4 to 5.5

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Which of the following is the component of most of the kidney stones ?

A. $ (COO)_2Ca $ B. $ (COONa)_2 $ C. $ (COO)_2 Ba $ D. $ (COO)_2Mg $

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Which of the following metal ions plays an important role in muscle contraction ?

A. $ K ^ + $ B. $ Mg^{2+} $ C. $ Na ^ + $ D. $ Ca ^ {2+} $

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White enamel of our teeth is ...

A. $ Ca_3(PO_4)_2 $ B. $ CaCl_2 $ C. $ CaF_2 $ D. $ CaBr_2 $

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Two mole of magnesium nitride on reacting with an excess of water gives :

A. One mole of ammonia B. Two moles of nitric acid C. Four moles of ammonia D. Three moles of ammonia

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Explanation

$ Mg_3 N_2 + 6H_2O \rightarrow 3Mg(OH)_2 + 2NH_3 $ 1mole 2 moles 2 mole 4 moles

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