Question # 1

If 250 cm³of hydrogen gas is cooled from 127°C to -73°C at constant pressure then new volume of gas is ______ dm³

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0.25

0.375

0.125

0.0625

A complete food contains at least

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Three nutrients

Ten nutrients

Six nutrients

Ten nutrients

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

Among the following the polycyclic aromatic compound is

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Styrene

Naphthalene

Toluene

Acetophenone

Which of the following does not give yellow precipitate with I2+ NaOH

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Acetone

Benzaldehyde

Acetildehyde

Acetophenone

The alternate name of Glucose is

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Dextrose

Grape sugar

Blood sugar

All

H₂and O₂are enclosed in porous vessel. The effusion of these gases will take place like

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H₂effuses 4 times the rate of effusion of O₂

O₂effuses into air 4 times the effusion of H₂

both effuse at same rate

H₂effuses at 8 times the rate of effusion of O₂

Considering the physical properties of the gases, which of the following statements about particles of gas is not true. The particles

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orderly arranged

randomly moving

having wide spaces

causing pressure

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

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1000 cm³

11000 cm³

1120 cm³

11200 cm³

The reference calomel electrode is made from which of the following?

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

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Cu

H

N

O

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

An organic compound, on treatment with Br2 in CC14 gives bromoderivative of an alkene. The compound will be

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CH3 - CH = Ch2

CH3CH = CHCH3

HC = CH

H2C = CH2

A substance which increases the rate of a reaction without being consumed during the reaction is called

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An autocatalyst

A catalyst

A negative catalyst

All of these

1.0 g pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by

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4 N

2 N

0.4 N

0.2 N

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Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Heat absorbed by a system when its volume does not change is equal to

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Internal energy of system

Enthalpy of system

Increase in internal energy of system

Increase in enthalpy of system

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

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