Question # 1

The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:

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Viscosity

Molar mass

Momentum

All of above

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

what is the exact value of angle in BF3

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90

104.51

119.5

120°

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

Theoretically, the temperature at which volume of gas become equal to zero is called

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Boiling point of water

Zero absolute

Zero Kelvin

both B and C

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

Cement is mixture of so many compounds roasted in rotary kiln.Which substance has greater percentage:

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Lime

Alumina

Silica

Magnesia

Diamond and silicon carbide are insoluble in all solvents because

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they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Which one of the following is not associated with SN2 mechanism

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100 % inversion of configuration

Tertiar alkyI halides

2nd order kinetics

Change of hy bridization from sp³ to sp² in transition state

Acetamides are formed by the reaction of carboxylic acids with

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Acids

Bases

Salts

NH₃

The radius of ion while considering it to be spherical in shape is called:

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Covalent radii.

Atomic radii.

Ionic radii.

Both (a) and (C).

Violet colour is obtained when dilute CuSO₄is added in alkaline solution of protein. This test is known as

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Biuret

Xanthoproteic test

Hopkins-cole

All of these

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

Which is not true about acetophenone?

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Reacts to form 2,4-dintrophenyl hydrazine

Reacts with Tollen's reagent to form silver mirror

Reacts with I₂/NaOH to form iodoform

On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

C₂H₅CHO and (CH₃)₂CO can be distunguished by testing with

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Phenyl hydrazine

Hydroxylamine

Fehling solution

Sodium bisulphate

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High temperature and low pressure

Low temperature and low pressure

Low temperature and high pressure

High temperature and high pressure

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0.60

1.67

0.66

2.6

Charge on electron was discovered by:

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Millikan.

Crook.

Neil Bohr.

Rutherford.

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