Question # 1

When acids react with metal with carbonates and bicarbonates which gas is produced.

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N2

H2

Cl2

CO2

Matter is present in neon signs in the state of

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Supereritical fluid

Gas

Liquid Crystal

Plasma

How many atoms are present in one gram of H2O?

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1002 x 10²³ atom

6.022 x 10²³atom

0.334 x 10²³atom

2.004 x 10²³atom

Mixture can be separated by means of

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Nuclear method

Phyical medhod

Chemical Method

All of these

How many elements are present in each 4th and 5th period.

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2

8

32

18

The amoutn of energy given out when an electron is added to an eatom is called.

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Electron affinity

Lattice energy

Ionization energy

Electronegativity

Atomic number of lanthanum is

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57

58

59

60

¹³ C and ¹⁴ C are both present in nature.

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0,1 %

1.1 %

0.9 %

1.5 %

Which compound is used a thinner is paint industry?

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H2O

C2H3OH

CH3COOC2H5

CH3COOH

What information was obtained fom discharge tube expriments?

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Electrons and protons were discovered

Structur eof atom was discovered

Neutrons and protons were discovered

Presence of nucleus in an atom was discovered

Malleability is the property by virtue of which a metal can be drawn into.

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Rods

Plates

Sheets

Wires

A base is a substance which neutralizes an acid. Which of these substances is not aa base.

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Aqueious ammonia

Calcium oxide

sodium Chloride

Sodium carbonate

The enthalpy of reaction H2+I2--- 2HI

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-571.6 k J

+53.8 kJ

11 kJ

-393.5 kJ

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