Question # 1

The spreading of fragrance of a rose or scent in air is due to.

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Effusion

Diffusion

Osmosis

Evaporation

Which of the following will have highest rate of diffusion

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O2

CO2

NH3

SO2

The pH of human blood is

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7.0

7.4

4.0

6.5

Chromatography in which stationary phase is a solid is called.

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Partition chromatography

Paper chromatography

High pressure liquid chromatography

Adsorption chromatography

Percentage ionic character of HF is.

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100%

80%

43%

57%

Chromatography involves the distribution of a solute between.

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Two stationary phases

Two mobile phases

A stationary phase and a mobile phase

Two stationary and two mobile phase.

Transition from various energy levels to the lowest energy level gives.

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Lyman series

Balmer series

Panchen sereis

Pfund series

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

Which of the following will have the same number of molecules at STP

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280 cm³of CO₂and 280 cm³of N₂O

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

28 g of N₂and 5.6 dm³of oxygen

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

The number of moles of CO₂which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

The nature of positive rays depends on

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The nature of electrode

The nature of discharge tube

The nature of residual gas

All of the above

The mass of one mole of electrons is

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

The standard heat of formation is measured at 1 atmosphere and

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0 ^oC

100 ^oC

293 ^oC

25 ^oC

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