Question # 1

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

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Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

Which of the following pairs of not form a dative covalent bond to each other?

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NH₃ and H⁺

H₂O and H⁺

NH₃ and BF₃

CH₄ and AICI₃

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

In esterification, the OH of carboxylic acid is replaced by

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OR+

R+

OR

R

Phosphoprotein comes under the type of proteins

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Simple protein

Derived protein

Conjugated

Both A & B

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

Which is the example of diffusion of gases

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bubbling in soda bottle

vapour condensing on a moist surface

hot air rising above a candle

spreading of smell from a scent bottle

A student put two eggs A and B in HCL solution, After five minutes he took them out for weighing but egg dropped in water accidentally. The student was able to take it out after 30 minutes, He weighed it, Its weight was 40.33g. Weight of egg B was also 40.33g. Teacher told him that if both eggs have been dropped in water, the weight of egg B would have been:

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equal to that of egg A

less than that of egg A

greater than that of egg A

unaffected instead

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

What is the cause of water pollution

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Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

Which bond is most stable

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C - Cl

C - F

C - Br

C - I

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84.84 %

89.89%

81.81%

90.90%

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

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C₂H₅OH

CH₃OH

CH₃COOH

C₂H₂

In the presence of copper electrodes the electrolysis of aqueous CuSO₄produces at cathode

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H₂gas

O₂gas

SO₂gas

Cu metal

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

Which of the following is the strongest acid?

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CF₃COOH

CBr₃COOH

CH₃COOH

CCl₃COOH

Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

In exothermic reversible reaction increase in temperature shift the equilibrium to :

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Remains unchanged.

Product side.

Reactant side.

None of above.

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

Benzophenone can be converted into benzene using

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Fused alkali

Anhydrous AlCl₃

Sodium amalgam in water

Acidfied dichromate

The experimental evidences for the existence of atomic nucleus comes from:

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Line spectrum of hydrogen.

Magnetic bonding of cathode rays.

Millikan oil drop experiment.

Scattering of alpha particles by thin metal foil.

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