How many statements is/are CORRECT about H-atom and its compound(s). (i) Ortho H 2 Para H 2 : Stability at low temperature (ii) H 2

Question

How many statements is/are CORRECT about H-atom and its compound(s). (i) Ortho $H_{2} >$ Para $H_{2}$ : Stability at low temperature (ii) $H_{2} < D_{2} < T_{2}$ : Boiling point order (iii) Atomic hydrogen > Nascent hydrogen > Molecular hydrogen : Reactivity order (iv) Diborane is electron-precise covalent hydride

(v) Temporary hardness is due to presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates (vi) Equimolar mixture of CO and $H_{2}$ is known as water gas.

TestHub · Accepted Answer

Correct statements: (II) Boiling point order ( $H_{2} < D_{2} < T_{2}$ ) is correct due to increasing van der Waals forces with mass; (III) Reactivity order is correct as atomic hydrogen is the most reactive; (VI) Water gas is indeed an equimolar mixture of CO and H₂.

Incorrect statements: (I) Para-H₂ is more stable than ortho-H₂ at low temperatures; (IV) Diborane (B₂H₆) is an electron-deficient hydride, not electron-precise; (V) Temporary hardness is caused by bicarbonates, while chlorides and sulfates cause permanent hardness.

Thus, there are exactly 3 correct statements.

Chemistry - Hydrogen and Its compound Question with Solution | TestHub

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