JEE Advanced 1992

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JEE Advanced 1992

Topic List

questions: 58

Verified solutions and explanations

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Easy (20)Medium (26)Hard (12)

Views: 5,746

For the redox reaction

MnO_{4}^{-} + C_{2} O_{4}^{2 -} + H^{+} ⟶ Mn^{2 +} + CO_{2} + H_{2} O

The correct coefficients of the reactants for the balanced reaction are

$MnO_{4}^{-} 2 C_{2} O_{4}^{2 -} 5 H^{+} 16$
$MnO_{4}^{-} 16 C_{2} O_{4}^{2 -} 5 H^{+} 2$
$MnO_{4}^{-} 5 C_{2} O_{4}^{2 -} 16 H^{+} 2$
$MnO_{4}^{-} 2 C_{2} O_{4}^{2 -} 16 H^{+} 5$

Topic:

Some Basic Concepts of Chemistry

Exam:

JEE Advanced 1992

View 2 solutions

Views: 5,740

One gram of commercial

AgNO_{3}

is dissolved in

50 mL

of water. It is treated with

50 mL

of a KI solution. The silver iodide thus precipitated is filtered off. Excess of

KI

in the filtrate is titrated with

(M /10) KIO_{3}

solution in presence of

6 M HCl

I^{-}

ions are converted into

ICl

50 mL

(M /10) KIO_{3}

20 mL

of the same stock solution of KI requires

30 mL

(M /10) KIO_{3}

under similar conditions. Calculate the percentage of

AgNO_{3}

in the sample.
Reaction

KIO_{3} + 2 KI + 6 HCl ⟶ 3 ICl + 3 KCl + 3 H_{2} O

Topic:

Some Basic Concepts of Chemistry

Exam:

JEE Advanced 1992

View solution

Views: 5,713

A 2,0 g sample of a mixture containing sodium carbonate, sodium bicarbonate and sodium sulphate is gently heated till the evolution of

CO_{2}

ceases. The volume of

CO_{2}

750 mm

Hg

pressure and at

298 K

is measured to be

123.9 mL

1.5 g

of the same sample requires

150 mL

(M /10) HCl

for complete neutralisation. Calculate the percentage composition of the components of the mixture.

Topic:

Some Basic Concepts of Chemistry

Exam:

JEE Advanced 1992

View solution

Views: 5,593

1.0 g

Fe_{2} O_{3}

55.2%

purity is dissolved in acid and reduced by heating the solution with zinc dust. The resultant solution is cooled and made up to

100.0 mL

. An aliquot of

25.0 mL

of this solution requires for titration. Calculate the number of electrons taken up by the oxidant in the reaction of the above titration.

Topic:

Some Basic Concepts of Chemistry

Exam:

JEE Advanced 1992

View solution

Views: 5,883

Which of the following relates to photons both as wave motion and as a stream of particles ?

Interference
$E = m c^{2}$
Diffraction
$E = h v$

Topic:

Structure of Atom

Exam:

JEE Advanced 1992

View 4 solutions

Views: 6,050

Which of the following does not characterise X-rays?

The radiation can ionise gases
It causes $ZnS$ to fluoresce
Deflected by electric and magnetic fields
Have wavelengths shorter than ultraviolet rays

Topic:

Structure of Atom

Exam:

JEE Advanced 1992

View solution

Views: 5,830

The statement that is not correct for the periodic classification of elements, is

the properties of elements are the periodic functions of their atomic numbers
non-metallic elements are lesser in number than metallic elements
the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
for transition elements the $d$ -subshells are filled with electrons monotonically with increase in atomic number

Topic:

Classification of Elements and Periodicity in Properties

Exam:

JEE Advanced 1992

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Views: 5,593

α, β

be the roots of the equation,

(x - a) (x - b) = c, c \neq = 0

. Then the roots of the equation

(x - α) (x - β) + c = 0

$a, c$
$b, c$
$a, b$
$a + c, b + c$

Topic:

Complex Number and Quadratic Equations

Exam:

JEE Advanced 1992

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Views: 5,482

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with rise of temperature due to

increase in average molecular speed
increase rate of collisions amongst molecules
increase in molecular attraction
decrease in mean free path

Topic:

States of Matter

Exam:

JEE Advanced 1992

View 5 solutions

Question 10

Views: 5,709

In the Bohr model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state

n

Topic:

Atoms

Exam:

JEE Advanced 1992

View 2 solutions

Question 11

Views: 5,300

In an X-ray tube, electrons accelerated through a potential difference of

15000 V

strike a copper target. The speed of the emitted X-ray inside the tube is .......

m / s

Topic:

Dual Nature of Radiation and Matter

Exam:

JEE Advanced 1992

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Question 12

Views: 5,612

In the nuclear process,

_{6} C^{''} \to_{5} B^{11} + β^{+} + X, X

stands for .......

Topic:

Nuclei

Exam:

JEE Advanced 1992

View solution

Question 13

Views: 5,866

In the Bohr model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state

n

Topic:

Atoms

Exam:

JEE Advanced 1992

View 2 solutions

Question 14

Views: 5,276

In an X-ray tube, electrons accelerated through a potential difference of

15, 000 V

strike a copper target. The speed of the emitted X-ray inside the tube is

m / s

Topic:

Dual Nature of Radiation and Matter

Exam:

JEE Advanced 1992

View 2 solutions

Question 15

Views: 5,111

In the nuclear process,

_{6} C^{''} \to_{5} B^{11} + β^{+} + X, X

Topic:

Nuclei

Exam:

JEE Advanced 1992

View 2 solutions

Question 16

Views: 5,915

At room temperature, the following reaction proceeds nearly to completion.

2 NO + O_{2} ⟶ 2 NO_{2} ⟶ N_{2} O_{4}

N_{2} O_{4}

, solidifies at

262 K

250 mL

100 mL

flask are separated by a stopcock. At

300 K

, the nitric oxide in the larger flask exerts a pressure of 1.053 atm and the smaller one contains oxygen at

0.789 atm

.
The gases are mixed by opening the stopcock and after the end of the reaction, the flasks are cooled to

220 K

. Neglecting the vapor pressure of the dimer, find out the pressure and composition of the gas remaining at

220 K

. (Assume the gases to behave ideally).

Topic:

States of Matter

Exam:

JEE Advanced 1992

View solution

Question 17

Views: 5,384

2 7^{\circ} C

, hydrogen is leaked through a tiny hole into a vessel for

20 min

. Another unknown gas at the same temperature and pressure as that of hydrogen is leaked through the same hole for

20 min

. After the effusion of the gases, the mixture exerts a pressure of

6 atm

. The hydrogen content of the mixture is 0.7 mole. If the volume of the container is

3 L

. What is the molecular weight of the unknown gas?

Topic:

States of Matter

Exam:

JEE Advanced 1992

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Question 18

Views: 5,839

If the harmonic mean and geometric mean of two positive numbers are in the ratio

4 : 5

. Then, the two numbers are in the ratio ....

Topic:

Sequences and Series

Exam:

JEE Advanced 1992

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Question 19

Views: 5,291

There are four balls of different colours and four boxes of colours, same as those of the balls. The number of ways in which the balls, one each in a box, could be placed such that a ball does not go to a box of its own colour is.... .

Topic:

Permutations and Combinations

Exam:

JEE Advanced 1992

View 2 solutions

Question 20

Views: 6,039

If in the expansion of

(1 + x)^{m} (1 - x)^{n}

, the coefficients of

x

x^{2}

are 3 and -6 respectively, then

m

6
9
12
24

Topic:

Binomial Theorem

Exam:

JEE Advanced 1992

View 6 solutions

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