Presence of which cation makes the water hard in nature?

(a)

Ca & Mg

(b)

Na & Mg

(c)

Ca & Na

(d)

Mg & F

Which of the following is produced by bombardment of neutrons with lithium?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

Beryllium

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise _____________

(a)

Ethanol

(b)

Methane

(c)

Methanol

(d)

Methanal

Rubidium belongs to______group of metals

(a)

transition

(b)

inner transition

(c)

alkali

(d)

alkaline earth

Which of the following oxides is the most basic in nature?

(a)

Na₂O

(b)

BeO

(c)

Li₂O

(d)

H₂O

Consider the following statements
1. Gypsum is calcium sulphate hemihydrate
2. Retrograde solubility is striking feature of gypsum
3. Alabaster is a variety of gypsum
Which of the following statement(s) given above is/ are incorrect?

(a)

1& 3

(b)

only

(c)

2 & 3

(d)

1,2 & 3

Hydroxides of beryllium are _______ in nature.

(a)

neutral

(b)

basic

(c)

acidic

(d)

amphoteric

The partial pressure of dry gas is ____________

(a)

greater than that of wet gas

(b)

lesser than that of wet gas

(c)

equal to that of wet gas

(d)

none of these

Vanderwaal's constant a and b are related with  ______________ respectively

(a)

attractive force and volume of molecules.

(b)

repulsive force and volume of molecules

(c)

attractive force and bond energy of molecules.

(d)

shape and repulsive force of molecules

Equal volumes of He, O₂ and SO₂ are taken in a closed container. The ratio of the partial pressures of gases He, O₂ and SO₂ would be __________

(a)

1 : 2 : 8

(b)

8 : 16 : 1

(c)

1 : 4 : 16

(d)

16 : 2 :1

The density of neon will be highest at: ______.

(a)

STP

(b)

0°C, 2 atm

(c)

273°C, 1 atm

(d)

273°C, 2 atm

Which of the following gases will have the lowest rate of diffusion?

(a)

H₂

(b)

N₂

(c)

F₂

(d)

O₂

Pressure of a gas is equal to __________.

(a)

\(\frac{F}{a}\)

(b)

F x a

(c)

\(\frac{a}{F}\)

(d)

F - a

For a cyclic process the volume of ΔU is ____________

(a)

maximum

(b)

minimum

(c)

zero

(d)

does not change

The entropy change can be calculated by using the expression, \(\Delta\)S = \(\frac { { q }_{ rev } }{ T } \). When water freezes in a glass beaker, choose the correct statement amongst the following __________

(a)

\(\Delta\)S (system) decreases but \(\Delta\)S (surroundings) remains same.

(b)

\(\Delta\)S (system) decreases but \(\Delta\)S (surroundings) decreases

(c)

\(\Delta\)S (system) decreases but \(\Delta\)S (surroundings) increases.

(d)

\(\Delta\)S (system) decreases and \(\Delta\)S (surroundings) decreases.

In which of the following reaction, standard entropy change (\(\Delta\)S°) is positive and standard Gibb's free energy change (\(\Delta\)G°) decreases sharply with increasing temperature?

(a)

C(graphite) + \(\frac { 1 }{ 2 } \)O₂(g) \(\rightarrow\) CO(g)

(b)

CO(g)+\(\frac { 1 }{ 2 } \)O₂(g) \(\rightarrow\) CO₂ (g)

(c)

Mg (s) + \(\frac { 1 }{ 2 } \)O₂(g) \(\rightarrow\) Mg(s)

(d)

\(\frac { 1 }{ 2 } \)C(graphite) + \(\frac { 1 }{ 2 } \)O₂(g) \(\rightarrow\) \(\frac { 1 }{ 2 } \)CO₂ (g)

Two moles of N₂ and two moles of H₂ are taken in a closed vessel of 5 litre capacity and suitable conditions are provided for the reaction. When the equilibrium is reached, it is found that a half mole of N₂ is used up. The equilibrium concentration of NH₃ is

(a)

0.2

(b)

0.4

(c)

0.3.

(d)

0.1

Equimolar solution of non-electrolyte in the same solvent have ____________

(a)

same boiling point and same freezing point

(b)

different boiling point. and different freezing point

(c)

same boiling point but different freezing point

(d)

same freezing point but different boiling point

Statement I: A solution of potassium chloride in water deviates from ideal behavior.
Statement II : The solute dissociates to give K⁺ and Cl^- ion which form strong ion dipole interaction with water molecules

(a)

Statement I& II are correct and II is the correct explanation of I

(b)

Statement! & IIare correct but II is not correct explanation of I

(c)

Statement I is correct but statement II is wrong.

(d)

Statement I is wrong but statement II is correct

Which one of the following has linear shape?

(a)

PbCl₂

(b)

SnBr₂

(c)

BeCl₂

(d)

CCl₂F₂

In which of the following homolytic bond fision takes place?

(a)

Alkaline hydrolysis of ethyl chloride

(b)

Addition of HBr to double bond

(c)

Photochlorination of methane

(d)

Nitration of benzene

The most stable alkene is _______

(a)

CH₂=CH-CH₂-CH₃

(b)

\(C{ H }_{ 2 }=\underset { \overset { | }{ C{ H }_{ 3 } } }{ CH } =C{ H }_{ 2 }\)

(c)

CH₂ = CH-CH = CH₂

(d)

CH₃-CH = CH-CH₃

The difference in potential energy between eclipsed and staggered form of ethane is ____________

(a)

4 kJ/mol

(b)

12.55 kJ/mol

(c)

2 kJ/mol

(d)

44 kJ/mol

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

Which of the following is a secondary haloalkane?

(a)

Bromoethane

(b)

2-Chloropropane

(c)

2-Iodo-2-methylpropane

(d)

1-Chloropropane