Question # 1

Which of the following has the maximum number of unpaired d-electrons?

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Zn

Fe²⁺

Ni³⁺

Cu⁺

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

Transition metals mostly are

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Diamagnetic

Paramagnetic

Neither diamagnetic nor paramagnetic

Both diamagnetic and paramagnetic

Vinegar made form cane sugar, now a days synthetically contains

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Citric acid

Lactic acid

Acetic acid

Palmitic acid

Maximum variable oxidation state is of:

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Mn⁺²

Fe⁺³

Cr⁺¹

a and b

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

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Violet

Green

Red

Blue

The number of electrons in the M shell of the element with atomic number 24 is

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24

12

13

8

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

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Phenyl hydrazine

Hydroxylamine

Fehling solution

Sodium bisulphate

Lysine is ______ amino acid

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Acidic

Basic

Natural

None of these

Tetraethyle lead causes disease:

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Typhoid

Respiratory

Stomach

Muscular

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

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Square root

Square

Twice

Cube

The potassium fertilizers are preferred for horticulture, tobacco and potatones, which of the following is popular potassium fertilizer

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Potassium oxide

Potassium chloride

Potassium sulphate

Potassium nitrate

The elements with atomic numbers 9, 17, 35, 53, 85 an all

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Noble gases

Halogens

Heavy metals

Light metals

In the extraction of iron, slag is produced which is

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CO

FeSiO₃

MgSiO₃

CaSiO₃

De halogenatiion of tetrahalides happens in the presence of active metal like

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Zn

Mg

Both a and b

None of them

The gasoline having octane No. 100 has ______

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More knocking

Less knocking

No knocking

Only knocking

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

If heat absorbed in the reaction, the process is said to be

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Exothermic

Isothermal

Adiabatic

Endothermic

The strongest acid among the following aromatic compound is

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Ortho-nitrophenol

Para-chlorophenol

Para-nitrophenol

Meta-nitrophenol

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di(4-bormophenyl) method

Methanol

Propan-1-ol

Propan-2-ol

A 4f orbital has

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one node

two node

three node

four nodes

The diameter of atoms is of the order:

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2* 10^-5m

2* 10^-10m

2* 10^-2m

2* 10^-3m

Rare earth elements are

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s-block elements

p-block elements

d-block elements

f-block elements

Energy of electron in the infinite Bohr orbit of H-atom is

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0 KJ/mole

1 KJ/mole

-1 KJ/mole

-1313.32 KJ/mole

Primary carbon attaches with other hydrogen atoms directly:

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One

Two

Three

At least one or more than it

Which of the following statements is no correct regarding bonding molecular orbitals?

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Bonding molecular orbitals possess ls energy than atomic orbitals from which they are formed.

Bonding molecular orbitals have low electron density between the two nuclei.

Every electron in bonding molecular orbitals contributes to the attraction b.w atoms.

Bonding molecular orbitals are formed when the electron waves undergo constructive interference.

When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as

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Williamsons synthesis

GHoffmans reaction

Wurtz reaction

Clemensen reaction

The chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

Which of the following salt is soluble in water

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CaCO₃

CaSO₄

MgSO₄

BaSO₄

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

Which one of the following particles has amass 1/1836 time, that of hydrogen?

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Neutron.

Proton.

Electron.

Positron.

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