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NEET Practice Questions (MCQs) with Answers & Solutions

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In which of the following specific condition, $ CO_2 $ gas is filled in cold drinks, and in soda water ?

A. at high temperature and high pressure B. at low temperature and high pressure C. at low temperature and low pressure D. at high temperature and low pressure

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In which condition, Henryâ€™s law is applicable ?

A. ideal behaviour of gaseous solute at high pressure and low temperature B. gaseous solute neither associate nor dissociate in solution C. gaseous solute react with solvent D. applicable in given all conditions

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Explanation

Henry's law is applicable when the gaseous solute neither associates nor dissociates in the solution. It assumes ideal behavior of the gas and no chemical reaction with the solvent.

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Now a days, divers uses the cylinder having gaseous mixture contains -

A. $ 2 \% O_2 and 98 \% He $ B. $ 11.7 \% He, 56.2 \% N_2 and 32.1 \% O_2$ C. $ 11.7 \% N_2, 56.2 \% He and 32.1 \% O_2$ D. $ 11.7 \% He, 56.2 \% O_2 and 32.1 \% N_2 $

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Explanation

Nowadays, divers use a gaseous mixture called Nitrox, which contains 32.1% oxygen, 56.2% nitrogen, and 11.7% helium. This mixture allows divers to stay underwater for a longer duration without the risk of nitrogen narcosis or decompression sickness.

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Due to which reason, $ O_2$ gas liberates from the blood of tissues of animal bodies

A. less temperature of tissues B. partial pressure of oxygen gas is more in tissues C. partial pressure of carbon dioxide is less in tissues D. partial pressure of oxygen gas is less in tissues

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Explanation

Oxygen gas is liberated from the blood of tissues in animal bodies when the partial pressure of oxygen in the tissues is lower than the partial pressure of oxygen in the blood. This concentration gradient drives the diffusion of oxygen from the blood to the tissues.

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Which of the following is not a substitutional solid solution ?

A. wc B. brass C. steel D. monel metal

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Explanation

Tungsten carbide (WC) is an interstitial solid solution, where carbon atoms occupy the interstitial spaces in the tungsten metal lattice. Brass, steel, and monel metal are examples of substitutional solid solutions, where one type of atom substitutes for another in the crystal lattice.

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Which of the following is a substitutional solid solution ?

A. wc B. brass C. steel D. monel metal

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$ Solute + solvent \rightleftharpoons solution; \triangle H \gt O $ . what would be the change in solubility of substance on increasing the temperature at equilibrium ?

A. increases B. decreases C. remains constant D. canâ€™t be predicted

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Explanation

The given equation represents an endothermic process (Î”H > 0). According to Le Chatelier's principle, an increase in temperature favors the endothermic reaction, thereby increasing the solubility of the substance.

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Which of the following is a colligative property ?

A. vapour pressure B. boiling point C. freezing point D. osmotic pressure

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What will be the ratio of any colligative properties of 1.0 m aqueons solutions of $ Nacl, Na_2So_4 ad K_4 [Fe(CN)_6] $ (Assume that solute completely (100%) dissociates in the solution)

A. 2:03:04 B. 1:02:04 C. 2:03:05 D. 1:03:05

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At constant temperature, vapour pressure of aqueous solutions of $ Na_2So_4, urea and AlCl_3 are equal with the vapour pressure of aqueous solution of 1.2 m kcl solution; then molality of an aqueons of Na_2So_4, urea and AlCl_3 $ are respectively –

3.6 m,2.4 m,4.8 m

0.8 m,2.4 m, 0.6 m

0.6 m, 3.6 m, 0.8 m

3.6 m, 1.2 m, 2.4 m

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Explanation

$ n_1.m_1 = n_2 .m_2 $ Where n_1 = number of ions produce when 1 st substance is dissolved in $ H_2 O $ $ m_1$ = mulality of 1st substance $ n_2 = number of ions produced when 2 nd substance is dissolved in H_2O $ according to its formula The values of $n_1 for Na_2 SO_4 , ureq and AlCl_3 $ are 3 ,1 and 4 respectively We get 0.8 m, 2.4 m, 0.6 m for $ Na_2 SO_4 , ureq and AlCl_3 $

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