JEE Mains 2004

Among

Al_{2} O_{3}, SiO_{2}, P_{2} O_{3}

the correct order of acid strength is

SO_{2}

$SO_{2} < P_{2} O_{3} < SiO_{2} < Al_{2} O_{3}$
$SiO_{2} < SO_{2} < Al_{2} O_{3} < P_{2} O_{3}$
$Al_{2} O_{3} < SiO_{2} < SO_{2} < P_{2} O_{3}$
$Al_{2} O_{3} < SiO_{2} < P_{2} O_{3} < SO_{2}$

Topic:

Classification of Elements and Periodicity in Properties

Exam:

JEE Mains 2004

View 2 solutions

Question 2

Which one of the following complexes is an outer orbital complex? (At. no. of

Mn = 25, Fe = 26, Co = 27, Ni = 28

)

$[Fe (CN)_{6}]^{4 -}$
$[Mn (CN)_{6}]^{4 -}$
$[Co (NH_{3})_{6}]^{3 +}$
$[Ni (NH_{3})_{6}]^{2 +}$

Topic:

Coordination Compounds

Exam:

JEE Mains 2004

View 3 solutions

Question 3

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

$(n - 1) d^{8} n s^{2}$
$(n - 1) d^{5} n s^{1}$
$(n - 1) d^{3} n s^{2}$
$(n - 1) d^{5} n s^{2}$

Topic:

The d-and f-Block Elements

Exam:

JEE Mains 2004

View 6 solutions

Question 4

As the temperature is raised from

2 0^{\circ} C

4 0^{\circ} C

, the average kinetic energy of neon atoms changes by a factor of which of the following?

$1/2$
$313/293$
$313/293$
2

Topic:

States of Matter

Exam:

JEE Mains 2004

View 8 solutions

Question 5

In van der Waals' equation of state of the gas law, the constant '

b

' is a measure of

intermolecular repulsions
intermolecular attraction
volume occupied by the molecules
intermolecular collisions per unit volume

Topic:

States of Matter

Exam:

JEE Mains 2004

View 2 solutions

Question 6

The correct order of bond angles (smallest first) in

H_{2} S, NH_{3}, BF_{3}

SiH_{4}

$H_{2} S < SiH_{4} < NH_{3} < BF_{3}$
$NH_{3} < H_{2} S < SiH_{4} < BF_{3}$
$H_{2} S < NH_{3} < SiH_{4} < BF_{3}$
$H_{2} S < NH_{3} < BF_{3} < SiH_{4}$

Topic:

Chemical Bonding and Molecular Structure

Exam:

JEE Mains 2004

View 2 solutions

Question 7

What type of crystal defect is indicated in the diagram shown below? (a) Frenkel defect (b) Schottky defect (c) Interstitial defect (d) Frenkel and Schottky defects

Topic:

The Solid State

Exam:

JEE Mains 2004

View solution

Question 8

angles between bond pair-bond pair of electrons is observed in

The maximum number of

9 0^{\circ}

$d s p^{3}$ hybridisation
$s p^{3} d$ hybridisation
$d s p^{2}$ hybridisation
$s p^{3} d^{2}$ hybridisation

Topic:

Chemical Bonding and Molecular Structure

Exam:

JEE Mains 2004

View 11 solutions

Question 9

Which one of the following has the regular tetrahedral structure?
(Atomic number :

B = 5, S = 16, Ni = 28

Xe = 54)

$XeF_{4}$
$SF_{4}$
$BF_{4}^{-}$
$[Ni (CN)_{4}]^{2 -}$

Topic:

Chemical Bonding and Molecular Structure

Exam:

JEE Mains 2004

View 3 solutions

Question 10

The correct order of bond angles (smallest first) in

H_{2} S, NH_{3}, BF_{3}

SiH_{4}

$H_{2} S < SiH_{4} < NH_{3} < BF_{3}$
$NH_{3} < H_{2} S < SiH_{4} < BF_{3}$
$H_{2} S < NH_{3} < SiH_{4} < BF_{3}$
$H_{2} S < NH_{3} < BF_{3} < SiH_{4}$

Topic:

Chemical Bonding and Molecular Structure

Exam:

JEE Mains 2004

View 9 solutions

Question 11

The states of hybridisation of boron and oxygen atoms in boric acid

(H_{3} BO_{3})

are respectively

$s p^{2}$ and $s p^{2}$
$s p^{2}$ and $s p^{3}$
$s p^{3}$ and $s p^{2}$
$s p^{3}$ and $s p^{3}$

Topic:

Chemical Bonding and Molecular Structure

Exam:

JEE Mains 2004

View 6 solutions

Question 12

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement

x

is proportional to
(a)

x^{2}

e^{x}

x

lo g_{e} x

Topic:

Work, Energy and Power

Exam:

JEE Mains 2004

View 18 solutions

Question 13

is applied over a particle which displaces it from its origin to the point

A force

F = (5 i + 3 j + 2 k) N

r = (2 i - j) m

. The work done on the particle in joule is
(a)

- 7

+ 7

+ 10

+ 13

Topic:

Work, Energy and Power

Exam:

JEE Mains 2004

View 5 solutions

Question 14

and another hollow sphere

One solid sphere

A

B

are of same mass and same outer radii. Their moment of inertia about their diameters are respectively

I_{A}

I_{B}

such that
(a)

I_{A} = I_{B}

I_{A} > I_{B}

I_{A} < I_{B}

\frac{I _{A}}{I _{B}} = \frac{d _{A}}{d _{B}}

where,

d_{A}

d_{B}

are their densities.

Topic:

System of Particles and Rotational Motion

Exam:

JEE Mains 2004

View 6 solutions

Question 15

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected? (a) Moment of inertia (b) Angular momentum (c) Angular velocity (d) Rotational kinetic energy

Topic:

System of Particles and Rotational Motion

Exam:

JEE Mains 2004

View 2 solutions

Question 16

revolves around the earth of radius

A satellite of mass

m

R

at a height

x

from its surface. If

g

is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is
(a)

gx

\frac{g R}{R - x}

\frac{g R ^{2}}{R + x}

(\frac{g R ^{2}}{R + x})^{1/2}

Topic:

Gravitation

Exam:

JEE Mains 2004

View 2 solutions

Question 17

The time period of an earth satellite in circular orbit is independent of
(a) the mass of the satellite
(b) radius of its orbit
(c) both the mass and radius of the orbit
(d) neither the mass of the satellite nor the radius of its orbit

Topic:

Gravitation

Exam:

JEE Mains 2004

View 2 solutions

Question 18

is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass

g

m

raised from the surface of the earth to a height equal to the radius

R

of the earth, is
(a)

2 m g R

\frac{1}{2} m g R

\frac{1}{4} m g R

m g R

Topic:

Gravitation

Exam:

JEE Mains 2004

View 8 solutions

Question 19

Suppose the gravitational force varies inversely as the nth power of distance. Then, the time period of a planet in circular orbit of radius

R

around the sun will be proportional to
(a)

R^{(\frac{n + 1}{2})}

R^{(\frac{n - 1}{2})}

R^{n}

R^{(\frac{n - 2}{2})}

Topic:

Laws of motion

Exam:

JEE Mains 2004

View 12 solutions

Question 20

A wire fixed at the upper end stretches by length

l

by applying a force

F

. The work done in stretching is (a)

\frac{F}{2 l}

Fl

2 Fl