A device used in the laboratory for intermittent production of gases without heating is

Analyze the question: The question asks for a laboratory device that produces gases on demand (intermittently) without needing heat.

Concept: Kipp's apparatus is a glass apparatus made of three connected chambers. A solid reactant (e.g., zinc granules or iron(II) sulfide) sits in the middle chamber, and an acid (e.g., dilute HCl or H₂SO₄) is poured in from the top reservoir. When the tap is opened, acid rises to contact the solid and gas is produced. When the tap is closed, the gas pressure pushes the acid back and away from the solid, so the reaction stops. This is what makes it "intermittent."

Typical gases made this way:

• Hydrogen: Zn + 2HCl → ZnCl₂ + H₂
• Hydrogen sulfide: FeS + H₂SO₄ → FeSO₄ + H₂S
• Carbon(IV) oxide: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

Checking each option:

• A. Aspirator: used to draw air or liquid by suction, not to generate gases.
• B. Delivery tube: only carries gas from one place to another.
• C. Fume cupboard: a ventilated enclosure for working safely with toxic fumes.
• D. Kipp's apparatus: produces gas on demand without heating. This matches.
• E. Geiger-Müller counter (the option reads "muller counter"): detects radiation, not related to gas production.

Answer: D, Kipp's apparatus.

Exam tip: Remember "Kipp = Kick-start and Kill-stop": you open the tap to start the gas and close it to stop. Kipp's apparatus works only when the solid is in lumps and the reaction needs no heat, so it can't be used for gases like oxygen from KClO₃ or chlorine from MnO₂ + HCl, which require heating.