Question # 1

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

At constant temperature in a given mass of and ideal gas.

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The ratio of pressure and volume remains constant

Volume always remains constant

Pressure always remains constant

The product of pressure and volume remains constant

In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

Which of the following statements is correct about galvanic cell

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Anode is negative charged

Reduction occurs at anode

Cathode is positively charged

Reduction occurs at cathode

The cell in which a non spontaneous redox reaction takes place as a result of electricity is known as.

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Voltaic cell

Denial cell

dry Cell

Electrolytic cell

Which of the following is a polar molecule

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CCl4

HCl

BF3

CO2

K_aand K_bof a conjugate acid and are related with k_was

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K_a+ K_b=K_w

K_a-K_b=K_w

K_a.K_b= K_w

K_a/ K_b= K_w

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

Which one of the following has highest pH

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Distilled water

1 M NH4OH

1 M NaOH

Water saturated with chlorine gas

When one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide.

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Diamond

C2H6

Methane

CO2

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

The value of Rydberg constant is.

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1.6 x 10⁷ m-1

1.9768 x 10⁷ m-1

1.09678 x 10⁷ m-1

1.7904 x 10⁷ m-1

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

The number of moles of hydrogen atoms in 3.2 g of methane CH4.

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0.2

0.4

0.6

0.8

The free expansion of the gas from high pressure towards the low pressure causes

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Increase of temperature

Decrease of temperature

Grater number of collisions among the molecules

Decrease of velocity of gas molecules

Which is pseudo solid

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CaF2

Glass

NaCl

CaCl2

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

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