NEET Practice Questions (MCQs) with Answers & Solutions

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The chemical formula of Tear gas is

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Explanation

Tear gas, also known as chloroacetophenone, has the chemical formula $CCl_3NO_2$. It is commonly used in riot control for its irritant properties, affecting the mucous membranes of the eyes, nose, and throat.

$ PH_4 I + NaOH forms $

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Explanation

When $PH_4I$ reacts with $NaOH$, it forms phosphine ($PH_3$) and sodium iodide ($NaI$). The reaction is as follows: \[ PH_4I + NaOH \rightarrow PH_3 + NaI + H_2O \]

Which is not an acid salt

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Explanation

$ Na_4P_2O_7 $ salt of strong acid & strong base.

The number of hydroxyl group in pyrophosphoric acid is

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Explanation

Pyrophosphoric acid, also known as diphosphoric acid, has the chemical formula $H_4P_2O_7$. It contains four hydroxyl groups (–OH). The structure of pyrophosphoric acid can be visualized as follows: \[ (HO)_2P(O)-O-P(O)(OH)_2 \]

Which of the following has highest B.P

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Explanation

$ NH_3 PH_3 AsH_3 SbH_3 $ BP \rightarrow 238.5 185.5 210.6 254.6

Which of the following exihibits highest solubility in $ H_2O $

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Explanation

Ammonia ($NH_3$) exhibits the highest solubility in water. This is due to the hydrogen bonding between the $NH_3$ molecules and $H_2O$ molecules. Ammonia has a lone pair of electrons on the nitrogen atom, which can form hydrogen bonds with water molecules, making it highly soluble.

$ HNO_3 $ in aqueous solution yields

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The three important oxidation state of P are

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Explanation

Phosphorus (P) mainly exhibits three oxidation states: -3, +3, and +5. In the -3 oxidation state, phosphorus forms compounds like phosphine ($PH_3$). In the +3 oxidation state, it forms compounds such as phosphorus trichloride ($PCl_3$). In the +5 oxidation state, it forms compounds like phosphorus pentachloride ($PCl_5$) and phosphoric acid ($H_3PO_4$).

Which show maximum valency

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Explanation

P Shows + 5 valency.

Which oxide of N is obtained on heating ammonium nitrate at $ 250 ^\circ $ C

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Explanation

When ammonium nitrate ( ext{NH}_4 ext{NO}_3) is heated to about 250°C, it decomposes to form nitrous oxide ( ext{N}_2 ext{O}) and water. The reaction is as follows: $$ ext{NH}_4 ext{NO}_3 ightarrow ext{N}_2 ext{O} + 2 ext{H}_2 ext{O} $$

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