B. Obeys all gas laws perfectly at all temperatures and pressures.
C. Cannot be liquefied.
D. Has no mass.
Answer: Option A
Solution (By JKSSB Mock Tests)
An ideal gas is a theoretical gas that perfectly obeys the ideal gas equation (PV=nRT) and all gas laws under all conditions. It assumes no intermolecular forces and zero molecular volume. Because of these assumptions, an ideal gas cannot be liquefied, unlike real gases which deviate at high pressures.
Explanation:
Salt is soluble in water, sand is not. Add water, stir to dissolve salt, filter to separate sand. Then evaporate the filtrate to recover salt. Sublimation separates sublimable solids (NH₄Cl, naphthalene). Magnetic for magnetic materials. Fractional distillation for liquid mixtures. This is a standard separation technique.
Explanation:
Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same molecular formula C₂H₆O but different functional groups: alcohol (-OH) vs ether (-O-). This is functional group isomerism. Ethanal is C₂H₄O, acetic acid C₂H₄O₂. Methoxymethane is another name for dimethyl ether. Functional isomers exhibit different chemical properties; ethanol reacts with Na, ether does not.
Explanation:
H₂O₂ decomposes when exposed to light (photochemical decomposition): 2H₂O₂ → 2H₂O + O₂. Light provides energy to break the O–O bond. To prevent decomposition, it is stored in amber or opaque bottles, often with stabilizers like urea or phosphoric acid. Also, traces of heavy metal ions catalyze decomposition. H₂O₂ is a strong oxidizing agent and bleaching agent.
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