Explanation

• The lightest gas used for filling party and advertisement balloons is hydrogen.
• However, due to its flammability, helium is more commonly used despite being slightly heavier, because it is safe and non-reactive.

Explanation

• Laboratory thermometers typically have a range of 10°C to 110°C.
• It allowing for precise temperature measurements in a variety of laboratory settings.

Explanation

• The complete transfer of one or more electrons from one atom to another atom forms an ionic bond.
• This type of bond is characterized by the electrostatic attraction between two ions with opposite charges, typically a metal cation and a nonmetal anion.
• The atom that loses an electron becomes a positively charged ion (cation), while the atom that gains an electron becomes a negatively charged ion (anion).

Explanation

Lime water when used with butter to form butyric acid can cure acidity.

The butyric acid is acidic.

The lime water (soluble form of calcium hydroxide) is basic.

Acid & base mix & become neutral which cures the acidity

Explanation

Benzene is more volatile because it has a low boiling point and evaporates quickly at room temperature.

Volatility refers to a liquid's tendency to vaporize — benzene does so more readily than the others listed.

Explanation

 As a chemical reaction progresses, the concentration of reactants decreases, leading to a decrease in the rate of reaction.

This is because there are fewer reactant particles available to collide and react. 

Explanation

 In $text{K}_2text{Cr}_2text{O}_7$, total oxidation state must be 0. K = +1, O = –2, so Cr must be +6 to balance the equation:

$$2(+1)+2(x)+7(–2)=0\Rightarrow x=+6$$

Explanation

 CH₃COONH₄ – Salt of weak acid (acetic acid) and weak base (ammonia) → Can be slightly acidic, neutral, or basic depending on their relative strength, but usually basic if acetate dominates

Explanation

Adding more SO₂ – This would increase the yield by shifting the equilibrium toward the product (Le Chatelier's principle).

Explanation

To find the moles, divide the mass of NaOH (60g) by its molar mass (40g/mol). 

Moles = 60/40 =1.5 moles