Question # 1

The color of ppts formed by Benedirct's test is

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Brick red

Wine red

Yellow

Orange

The process in which water molecules surround solute particles is called

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Hydration

Salvation

Hydrolysis

Dehydration

In which molecule carbon atom is sp²hybridized

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CH₄

C₂H₄

C₂H₂

None of the above

Carboxylic acids generally exists in cyclic

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Monomers

Dimers

Trimers

Tetrameter

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

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Stark effect

Zeeman effect

Compton effect

Photoelectric effect

C₆H₆Cl₆can be obtained from

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HCl and Benzene

Cl₂and Benzene and AlCl₃

Cl₂and Benzene in diffused light

NaOCl and Benzene

Standard reduction electrode potential of three metals A, B and C are erespectively + 0.05 V, -3.0 and -1.2V. The reducting power of

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B > C > A

A > B > C

C > B > A

A > C > B

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

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450°C

250°C

850°C

1000°C

2.5 faradays of electricity is passed through solution of CuSO_{4. The number of gram equivalents of copper deposited on the cathode would be}

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1

2

2.5

1.25

Which of the following element is most reactive

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Li

Na

K

Cs

Which of the following will have the highest boiling point at 1 atm pressure?

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0.1 M NaCl

0.1 M Sucrose

0.1 M BaCl₂

0.1 M Glucose

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

In the atmosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

According to Mendleev, the physical and the chemical properties are the periodic function of their

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Atomic number

Atomic mass

Atomic wt

None

Which of the following human activities are contaminating surface and ground waters

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Pesticides

Septic tanks

Petroleum and natural gas production

All of these

The degree of unsaturation in fats or oils is usually measured by numbers of grams of iodine required by 100 grmas of fat, this is called

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Oil number

Saturation number

Iodine number

Un saturation number

Coordination number of Pt in [PtCl (NO²) (NH³)⁴]^2-

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2^-

4

1

6

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

The heat contents of all the elements in their standard states are taken to be

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1

2

0

None

Linear shape is associated with set of hybrid orbitals?

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sp

sp2

sp3

dsp2

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

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Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

If a salt bridge is removed between the two half cells, the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

Which nitrogen fertilizer is favoured in tropical regions because of its-hygroscopic nature

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Ammonium sulphate

Ammonium nitrate

Ammonium chloride

Ammonium phosphate

On warming with silver powder,chloroform is converted into

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Acetylene

Hexachloroethane

1,1,2,2-tetrachloroethane

ethylene

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

F₂, Cl₂, Br₂and l₂lie below SHE is the Electro chemical series that is why these

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Undergo reduction

Undergo oxidation

Liberate H₂gas with steam

None of these

Series starting from57La,42Hf -80Hg is in the period:

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4th

5th

6th

7th

The oxidation number of chromium in K₂Cr₂O₇is

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14

12

6

None of these

Which salt is used for the treatment of hyperacidity in stomach

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NaCl

KCl

NaHCO₃

Na₂CO₃

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