Question # 1

Li belongs to ________________ block.

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s

p

d

f

Spontaneous chemical reactions take place in:

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electrolytic cell

Galvanic cell

Nelson' s cell

downs cell

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

Group runs from ________________

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Top to bottom

Left to right

Top to right

Bottom to left

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

_________ which occupies space and have mass.

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Matter

Atom

Molecule

All of above

A solution whose molarity is known is called:

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Dilute solution

Concentrated solution

Saturated solution

Molar solution

H° + H° are ________________ in energy.

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Lower

Higher

Medium

Nil

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

Solids are fixed ____________

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Shape

Velocity

Mass

Atoms

What is pOH of 0.01 M solution of HCl?

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1

4

12

13

Water dissolves Non-ionic compounds by:

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Ion-Ion forces

Dipole forces

Dipole - Dipole forces

Hydrogen Bonding

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

Concentration of copper are is carried out by process.

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Roasting

Forth floatation

Gravity sepration

Electrostatic separation

The process which convert vegetable oil into banaspati ghee called.

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Hydrogenation

Halogenation

a and b

None of these

Which acid is used for etching glass?

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HF

HCl

HBr

HI

How many % age of nitrogen in urea fertilizers?

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40.6

45.6

46.6

50

The water which produces good lather with soap is called:

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soft water

hard water

heavy water

typical water

Which is the natural sugar found in starchy food.

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Pentose

Dextrose

Hexose

All of them

Which one of these is used as anaesthesia?

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carbon black

Mehtane

Ethane

Chloroform

When acid reacts with sulphites and Bi sulphates which gas is evolved?

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H2

CO₂

SO₂

NH₃

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

The nature of positive rays depends on

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The nature of electrode

The nature of discharge tube

The nature of residual gas

All of the above

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

In which de excitation of electron of hydrogen atom maximum energy is relaeased.

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From n2 to n1

From n3 to n2

From na to n1

From na to n2

The comparative rates at which the solutes move in paper chromatography depends on.

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The size of paper used

Their Rt values solutes

Temp of the experiment

Size the chromate grapic tank

Which of the hydrogen halides has the highest percentage of ionic character

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HF

HBr

HCI

HI

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

In a group of periodic table, ionization energy.

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Decreases

Increases

Remains same

First increases than increases

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

10 g of NaOH have been dissolved per kg of solvent The molality of solution.

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0.25 m

0.5 m

1.0 m

2.0 m

Which element form an ion with charge +3

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Beryllium

Aluminum

Carbon

Sillicon

Which of the following is a non typical transition element.

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Cr

Mn

Zn

Fe

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Typical transition element is

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Sc

CO

Ra

Y

Which is used in the leather industry

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Borax

Boric acid

Boric oxide

Tetra Boric acid

The solution of which acid is used for seasoning of food

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Benzoic acid

Butanoic acid

Formic acid

Acetic acid

Phosphorous helps the growth of

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root

leave

stem

seed

Which element shows highest oxidation state among these

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Zn

Fe

Mn

Sc

Cyclic structure of benzene was proposed by

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Dewar

Faraday

Down

Kekule

Aluminium does not corrode because.

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It is a semi metal

It is a silver shining metal

It does not react with O2

It forms a protective layer of Al2O3

Mark the incorrect statement

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Metallic character increase down the group

Metallic character increase from left to right along a period

Metallic character decrease from left to right along a period

Metallic character remains the same down the group