4 g of a hydrocarbon on complete combustion gave 12.571 g of CO₂ and 5.143 g of water. What is the empirical formula of the hydrocarbon ?

• CH

• CH₂

• CH₃

• C₂H₃

What is the gas liberated when alkaline formaldehyde solution is treated with H₂O₂?

• CO₂

• O₂

• CH₄

• H₂

23.

The products formed when heavy water is reacted with magnesium nitride, are

• NH₃, Mg(OH)₂

• NH₃, Mg(OD)₂

• ND₃, Mg(OH)₂

• ND₃, Mg(OD)₂

The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution, is

• CaSO₄.NH₄Cl, H₂O

• CaCl₂.(NH₄)₂SO₄ , H₂O

• CaSO₄.(NH₄)₂SO₄ 2H₂O

• CaCl₂, NH₄Cl.2H₂O

Oxalic acid reacts with concentrated H₂SO₄ to give a mixture of two gases. When this mixture is passed through caustic potash, one of the gase is absorbed. What is the product formed by the absorbed gas with caustic potash?

• K₂SO₄

• K₂HCO₄

• K₂CO₃

• KOH

Thermite is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X, Y respectively are

• 3, 1

• 3, 2

• 1, 1

• 2, 3

What are the products formed when ammonia reacts with excess chlorine?

• N₂ and NCl₃

• NCl₃ and HCl

• N₂ and NH₄Cl

• N₂ and HCl

Consider the following reaction,

N₂(g) + 3H₂(g) → 2NH₃(g)

The rate of this reaction in terms of N₂ at T K is $\frac{-\mathrm{d} \left[{\mathrm{N}}_2\right]}{\mathrm{dt}}$ = 0.02 mol L^-1s^-1. What is the value of -d[H₂]/ dt (in units of mol L^-1s^-1) at the same temperature.

• 0.02

• 50

• 0.06

• 0.04

What is the reduction electrode potential (in volts) of copper electrode when [Cu²⁺] = 0.01 M is in a solution at 25°C?

(E° of Cu²⁺/ Cu electrode is + 0.34 V)

• 0.3991

• 0.2809

• 0.3105

• 0.3695

What is the reaction occurring at the anode in Down's process for the extraction of sodium?

• 4OH^- → 2H₂O + O₂ + 4e^-

• Na⁺ + e^- → Na

• 2Cl^- → Cl₂ + 2e^-

• NaOH → Na⁺ + OH^-