Question # 1

The absolute zero means:

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273.15 °C

-273.15 °C

0 °C

-373.15 °C

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

The quantity of a matter in a body is called ____________

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Mass

Weight

Atom

Molecule

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

The boiling point of H2O is:

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100

12

1.105

9

The mixture of two component is called .

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Homogeneous mixture

Binary solution

Both a & b

Nil

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

First energy level is denoted by:

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K

L

M

N

CO2 the oxidation number of C =.

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+1

+2

+3

+4

The core of the earth is mostly made from ____________

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Nickel

Iron

A % B

Copper

Which molecules is donor in nature?

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H₂

NH₃

O₂

HF

____________ is synthetic fiber.

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Cotton

Woal

Nylon

Silk

Who put forward '' the vital force theory''?

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Kolbe

Wohler

Berzellius

Jabir - Bin - Hayan

The value of K_c depends on.

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Temperature

Pressure

Volume

Atmosphere

Which part of digestive system glucose absorb.

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Stomach

Liver

Small intestine

Large intestine.

Which acid is found in Ant sting?

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Citric Acid

Formic Acid

Uric Acid

Sulphuric acid

Which one of the followoing is the Hardest coal.

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Peat

Lignite

Bituminous

Anthracite

In which of the following groups , oxygen is attached on both sides with carbon atoms.

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Ketone group

Ether group

Aldehyde group

Easter group

In hydrogenation of vegetable oil catalyst employed is.

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Ni

Pt

ZnO

Cr₂O₃

Pentahydroxy ketone is called as:

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Glucose

Fructose

Starch

Sucross

Which one of the following salts makes the water permanently hard?

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NaCO₃

NaHCO₃

CA(HCO₃)₂

CaSO₄

The recombination of O and O₂ in mid stratosphere is an

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Exothermic reaction

Endothermic reaction

Heat absorbing process

None of these

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

Which element has highest ionization potential

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Li

Na

K

Rb

The change in heat energy of a chemical reaction at constant temperature and pressure is called.

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

The power of which the concentration of a substance appears in the rate expression is known as

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order of reaction with respect to that substance

Rate of reaction

Order of reaction

Molecularity of reaction

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1

2

3

None of these

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

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

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

Which one of the following gases diffuse more rapidly.

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Cl2

CO2

CH4

N2

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

Wohler synthesized first organic compound in laboratory from

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Heating cyanogen's

Cyanogen and ammonium chloride solution

Cyanogen and HNO2

Heating ammonium cyanate

Tincal is a mineral of

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Al

C

Si

B

Which one of the following is a metalloid.

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sulphur

Antimony

Mercury

Zinc

When hydrolyzed, protein yields.

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Fatty acid

Glycerol

Amino acid

Nucleosides

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

Which hydride is intermediate in nature.

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NaH

BeH2

NH3

HCl

Which one is used as debydrating agent for alcohol.

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H2SO4

Al2O3

H3PO4

All of these

Boiling point range of petroleum ether.

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5- 20 ^oC

10- 30^oC

20- 60^oC

30- 90^oC

Formula of chloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

Which is the strongest acid

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HCIO

HCIO₂

HCIO₃

HCIO₄

In which hybridization bond angle is maximum

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sp3

sp2

sp

sp3 and sp have same angles