Question # 1

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

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chesmistry

Geology

Physics

Mechanics

The oxidation number of H is -1 in the compound

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H₂O

H₃BO₃

NaOH

NaH

Of the following four reactions, formic acid and acetic acid differ in which respect?

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Replacement of hydrogen by sodium

Formation of ester with alcohol

Reduction of Fehling solution

Blue litmus reaction

When a carboxylic acid reacts with a metal ______ gas is evolved

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H₂

CO₂

CI₂

None of these

When benzene is burnt in free supply of air, it is completely oxidized to

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CO

CO₂₊H₂O

H₂CO₃

None

Which of the following is an electrophile

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Bromine

KBr

NH₃

Benzene

Acetylene gives

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White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2

White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12

White ppt. with both

Red ppt. with both

Which of the following is the hardest metal among following

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Li

Na

Rb

K

Quantum number value for 2p orbitals are:

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n=2 ,l=1

n=1 ,l=2

n= ,l=0

n=2 ,l=0

Sterols, vitamin D and terpenese belong to

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Simple lipids

Complex lipids

Derived lipids

None

Acetaldehyde is used to make

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Rubbber

Antiseptics

Phenolic resin

All of these

In a solution of CuSO₄how much time will be required to precipitate 2g copper by 0.5 ampere current?

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12157.48 sec

102 sec

510 sec

642 sec

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic acid

It is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

Alkanes have functional group :

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----X

--OH

----COH

No functional group

The formation of PVC from vinyl chloride is an example of

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Substitution reaction

Addition polymerization

Condensation polymerization

Condensation reaction

How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

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3

4

5

6

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

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A primary alcohol

A secondary alcohol

An eher

A phenol

Which polymerization is free radical machanism based

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Addition

Condensation

Both a and b

None

Which of the following forms a toxic substance in blood by combing with hemoglobin?

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

Rates of organic reactions are

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Fast

Very fast

Slow

Non-reactive

Which reagent is used to reduce a carboxylic group to an alcohol

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H₂/Ni

H₂/Pt

NaBH₄

LiAIH₄

A solution having pH = 4 its OH^-ion concentration in mole dm^-3is

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1.0 x 10^-4

1.0 x 10^-10

1.0 x 10^-14

1 x 10⁰

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

The bond order in No is 2.5 while that in NO⁺is 3.Which of the following statements is true for these two species?

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Bond length in NO⁺is greater than in NO

Bond length in unpredictable

Bond length in NO⁺is equal to that in NO

Bond length in NO is greater than in NO⁺

The order of distance between the various Bohr orbits is

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r₂- r₁> r₃- r₂> r₄- r₃> ......

r₁> r₂> r₂- r₃> r₄-r₃> .....

r₂-r₁= r₃- r₂= r₄- r₃> .....

r₂- r₁> r₃- r₂< r₄- r₃< ....

The amino acids which human body can synthesize are called ______ amino acid

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Essential

Non essential

Acidic

Basic

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

Without proper suction filtration is

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Rapid process.

Fague process.

Slow process.

Useless process.

Phenol gives ---------- Colour with neutral FeCl₃solution

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Violet

Green

Red

Blue

Alkanes containing carbon C₁₈ownwards are

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Gases

Liquids

Waxy solids

Solids

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