Question # 1

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

Molar mass of repeating unit of PVC monomer is:

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43

53

63

73

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?

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Cl₂> Br₂> I₂

Br₂> Cl₂> I₂

Cl₂> Br₂> I₂

I₂> Br₂> Cl₂

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

The branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

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

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increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

Furan is a compound

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Acyclic

Alicyclic

Heterocyclic

non-aromatic

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

What is the molarity of a solution containing 15.0 g urea in 500 cm³of solution

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0.5 M

1 M

1.5 M

2 M

Alkanes have functional group :

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----X

--OH

----COH

No functional group

Hydrogen gas and iodine vapours combine to form Hl at 425°C, the same composition of mixture is present if we start with decomposition of Hl. It suggests

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A static equilibrium

Law of mass action

A dynamic equlibrium

Irreversible reaction

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Zn

H

S

O

To differentiate isomers we use

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n-

iso-

neo

All of them

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Ethanol in the presence of concentrated sulphuric acid

Potassium hydroxide

Sodium

Sodium carbonate

Which of the following isoelectronic ions has the lowest ionization energy?

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K⁺

Ca²⁺

Cl^-

S^2-

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

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Anode

Cathode

May be anode or cathode

None of these

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

Polymer found by the combining of three different monomers is called:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymer

Ethanol containing some methanol is called

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Absolute spirit

Rectified spirit

Power alcohol

Methylated spirit

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