Question # 1

Density of a gas increases, when its:

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temperature is increased

pressure is increased

volume is kept constant

none of these

For diagnosis of goiter in thyroid gland we use

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Co-60

C-14

I-131

Sr-90

Considering the electronic configuration of atoms which atom with the given atomic number will be the most stable one?

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6

8

10

12

The earth is made up of ____________ % of aluminum.

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6

7

8

9

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

Atoms reacts with each other because:

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They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

When U-235 breaks up, it produces?

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electrons

neutrons

protons

nothing

The example of solution of a solid solute in a solid solvent is

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Brass

Fog

Cheese

Air

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

Th name of chemist who arranged all the elements in the periodic tale is :

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J.Newlands

Columb

Einstine

None of these

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

Phenolphthalein produces red colour in

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Acid

Base

Both a and b

None of these

Which one is used for alkaline batteries?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

Ammonical brine is prepared by dissolving ammonia gas in.

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NaCl

CaCO₃

CaCl₂

Na₂SO₄

Clark's method is used to remove the hardness of water, in this method which is used.

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Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

Which one of the following is a synthetic fiber:

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cotton

wool

nylon

silk

The nature of enzyme is.

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Protein

Vitamin

Fats

Carbohydrate

At which region all weather occurs?

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Global warming causes rising of the sea level. The cause of global warming is.

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CO₂ gas.

SO₂gas.

NO₂gases.

O₃gas.

The elements that do not conduct heat and electricity are called.

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Metallurgy

Non metal

Metalloid

Alloy

^{RNA consists of}

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Ribos

Pentose

Hexose

Trioses

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

Which of the following statements is not correct regarding bonding molecular orbitals

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

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

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

In case of non volatile solute, lowering of vapour pressure is proportional to.

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Mass fraction of solute

Mole fraction of solvent

Mole fraction of solute

None of the above

The molecule having zero dipole moment is.

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NH3

CHCl3

H2O

BF3

In solvent extraction, solute can be separated from solution, by shaking the solution with solvent in which the solute is.

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More soluble

Partially soluble

Insoluble

soluble at high temp

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

One molecule of hemoglobin in heavier than one atom of hydrogen.

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680 times

6800 times

68000 times

680000 times

Under which conditions of temperature and pressure will a real gas behave most like an ideal gas.

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Low temperature and how pressure

High temperature and high pressure

Low temperature and high pressure

High temperature and low pressure

An aqueous solution of ethanol in water has vapour pressure

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Equal to that water

Equal to that of ethanol

More than that of H₂O

less than that of water

In the ground state of an atom, the electrons is present.

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest form the nucleus

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

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

The chemist who synthesized urea from ammonium cyanate was

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Berzelius

Kolbe

Wholer

Lavoisier

Which is most difficult to be oxidized

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CH₃CHO

CH₃COCH₃

HCHO

C₂H₅CHO

Colour of which halogen is not correctly related.

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F2 --- colourless gas

Cl2---- greenish yellow gas

Br2----- Reddish brown liquid

I2-------- grayish Black solid

Which one of the following can best be used to distinguish between samples of ethane and ethene

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Aqueous BaCl2

Aqueous bromine

Lime water

Litmus solution

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

The macro nutrients are required in ranging from

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5 kg to 200 kg

5 kg to 200 g

6g to 200 g

1 kg to 100 kg

Keeping in view size of atoms ,which order is the correct one.

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > I

Which of the following compounds will not give Iodoform test on treatment with I₂/ NaOH

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Acetaldehyde

Acetone

Butanone

3-Pentanone

Which substance is formed by the catalytic oxidation of methane at 100 ^oC, 200 atmospheric pressure and copper catalyst

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Methanol

Methanal

Methanoic acid

All of these