11.

The volume-temperature graphs of a given mass of an ideal gas at constant pressures are shown below. What is the correct order of pressures?

• P₁ > P₃ > P₂

• P₁ > P₂ > P₃

• P₂ > P₃ > P₁

• P₂ > P₁ > P₃

Identify the reaction for which $∆\mathrm{H} \ne ∆\mathrm{E}$ :

• S(rhombic) + O₂ (g) → SO₂ (g)

• N₂ (g) + O₂ (g) → 2NO (g)

• H₂ (g) + Cl₂ (g) → 2HCl (g)

• CO (g) + $\frac{1}{2}$O₂ (g) → CO₂ (g)

Which of the following is used for making optical instruments ?

• SiO₂

• Si

• SiH₄

• SiC

Which of the following reaction can produce aniline as main product?

• C₆H₅NO₂ + Zn/ KOH

• C₆H₅NO₂ + Zn/ NH₄Cl

• C₆H₅NO₂ + LiAlH₄

• C₆H₅NO₂ + Zn/ HCl

Which of the following reagents when heated with ethyl chloride, forms ethylene ?

• Aqueous KOH

• Zn/ HCl

• Alcoholic KOH

• HI

Which of the following statements is not correct?

• In oxyhaemoglobin Fe²⁺ is paramagnetic.

• During respiration the size of Fe²⁺ increases when it changes from diamagnetic to paramagnetic state.

• Four heme groups are present in haemoglobin

• Heme is the prosthetic group and it is non-protein part.

CFCl₃ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?

• Cl₂

• Cl^-

• F^-

• Cl^*

At T (K), 100 L of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T (K) ?

• 50

• 60

• 30

• 40

Observe the following statements:

I. Bleaching powder is used in the preparation of chloroform.

II. Bleaching powder decomposes in the presence of CoCl₃ to liberate O₃.

III. Aqueous KHF₂ is used in the preparation of fluorine.

The correct combination is :

• I, II and III are correct

• Only II is correct

• Only I and III are correct

• Only I and II are correct

Which of the following reacts with benzene in presence of anhydrous aluminum chloride and forms acetophenone ?

• CH₃Cl

• CH₃COOH

• CH₃CHO

• CH₃COCl