The number of molecules in 40 g of sodium hydroxide is __________

(a)

6.023\(\times\)10^-23

(b)

3.0115\(\times\)10²³

(c)

6.023\(\times\)10²³

(d)

2 x 6.023\(\times\)10²³

Two electrons occupying the same orbital are distinguished by ___________

(a)

azimuthal quantum number

(b)

spin quantum number

(c)

magnetic quantum number

(d)

 orbital quantum number

The oxidation state of alkali metal is _______

(a)

+2

(b)

+1

(c)

+3

(d)

0

Ionic hydrides are formed by _____________

(a)

halogens

(b)

chalogens

(c)

inert gases

(d)

group one elements

Which is the correct sequence of solubility of  carbonates of alkaline earth metals ?

(a)

BaCO₃ > SrCO₃ > CaCO₃ > MgCO₃

(b)

MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃

(c)

CaCO₃ > BaCO₃ > SrCO₃ > BaCO₃

(d)

BaCO₃ > CaCO₃ > SrCO₃ > MaCO₃

The value of the gas constant R is ____________

(a)

0.082 dm³ atm.

(b)

0.987 cal mol^-1K^-1

(c)

8.3 J mol^-1 K^-1

(d)

8 erg mol^-1 K^-1

The work done by the liberated gas when 55.85 g of iron (molar mass 55.85 g mol^-1) reacts with hydrochloric acid in an open beaker at 25°C _____________

(a)

- 2.48 kJ

(b)

-2.22 kJ

(c)

+2.22 kJ

(d)

+ 2.48 kJ

The oxidation of SO₂ and O₂ to SO₃ is an exothermic reaction. The yield of SO₃ will be maximum if ____________

(a)

Temperature and pressure both are increased

(b)

Temperature decreased, pressure increased

(c)

Temperature increased, pressure constant

(d)

Temperature and pressure both decreased

Normality of 1.25M sulphuric acid is ___________

(a)

1.25 N

(b)

3.75 N

(c)

2.5 N

(d)

2.25 N

Which among the following molecule obeys octet rule?

(a)

NO

(b)

NO₂

(c)

N₂O₃

(d)

ClO₂

A sample of 0.5g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50mL of 0.5M H₂SO₄. The remaining acid after neutralisation by ammonia consumed 80mL of 0.5 MNaOH, The percentage of nitrogen in the organic compound is __________

(a)

14%

(b)

28%

(c)

42%

(d)

56%

Which of the following species is not electrophilic in nature ?

(a)

Cl⁺

(b)

BH₃

(c)

H₃O⁺

(d)

⁺NO₂

The number of axial hydrogen atoms in chair form of cyclohexane is ______________

(a)

3

(b)

6

(c)

12

(d)

2

Hunsdiecker reaction is used to prepare alkyl chloride and alkyl bromide starting from

(a)

diazonium salt

(b)

silver salts of carboxylic acid

(c)

sodium salt of carboxylic acid

(d)

alcohol

Ozone depletion will cause ___________.

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming

The stabilisation of a half filled d - orbital is more pronounced than that of the p-orbital why?

What are the anomalies of the long form of periodic table?

Give an expression for the rate of diffusion of a gas and to its molecular weight

How does the effect of the process C₂ \(\rightarrow\) C₂⁺ + e^- affect the bond order ?

Explain paper chromatography.

How does the addition reaction affect the hybridisation of the substrale ? Give example.

Explain the mechanism of S_N1 reaction by highlighting the stereochemistry behind it

Calculate the amount of water produced by the combustion of 32 g of methane.

What are transfermium elements?

Complete the following chemical reactions and classify them into
(a) hydrolysis (b) redox (c) hydration reactions.
(1) KMnO₄ + H₂O₂ ➝
(2) CrCl₃ + H₂O ➝
(3) CaO + H₂O ➝

Which of the following gases would you expect to deviate from ideal behaviour under conditions of low temperature F₂, Cl₂ or Br₂? Explain.

Mention the condition for Adiabatic, isothermal, isobaric, isochoric and cyclic process.

The observed depression in freezing point of water for a particular solution is 0.093^o C. Calculate the concentration of the solution in molality. Given that molal depression constant for water is 1.86 K Kg mol^-1.

Suggest and explain the method suitable to purify the organic compounds depending on their boiling points.

Among anthracene and cyclopentadiene which is aromatic? Give reason for your answer.

Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water ?

1. Explain displacement reaction ? Explain its two types with an example for each.

2. Explain the periodic trend of ionisation potential.

1. (a) How is H₂O₂ prepared ?
   (b) Explain about the structure of H₂O₂

2. Discuss the similarities between beryllium and aluminium.

1. Calculate the total pressure in a mixture of 8 g of oxygen and 4 g of hydrogen confined in a vessel of 1 dm³ at 27° C. [R = 0.083 bar dm³ K^-1 mol^-1.]

2. List the characteristics of Gibbs free energy

1. The equilibrium constant at 298 K for a reaction is 100.
   A + B \(\rightleftharpoons \) C + D
   If the initial concentration of all the four species is 1 M, the equilibrium concentration of D (in mol lit^-1) will be

2. Write a note on principle involved in chromatography and explain thin layer chromatography.

1. Give a detailed account on the different mechanisms followed in elimination reaction.

2. Ethane burns completely in air to give CO₂, while in a limited supply of air gives CO. The same gases are found in automobile exhaust. Both CO and CO₂ are atmospheric pollutants
   i) What is the danger associated with these gases
   ii) How do the pollutants affect the human body ?