Question # 1

Lanthanide series starts after the elemetn

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Osmium

Actinium

Lanthanum

None of these

Group nuebr tells about the

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Number of shells

Number of valence electrons

Both a and b

None of these

The structure of C atom in diamond is.

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Pentagonal

Triangle

Hexahedral

Tetrahedral

What will be the relative atomic mass of nitrogen given the abundance of its two isotopes, ¹⁴ N and ¹⁵N are 99.64 and 0.35

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14.0210

14.2100

14.0021

14.1200

When molten copper and olten zinc are mixed together , they give rise to a new substnce called brass. Predict what type of bond is formed between copper and zinc.

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Ionic bond

Coordinate Covalent bond

Metallic bond

Covalent Bond

Elements of Group1 are called.

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Alkali Metlas

Alkali earth metals

Transition metals

Halogen

Such reaction which continue in both directins are called.

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Dynamic

Irreversible

Reversible

Non- reactive

Water has high boiling point as compared a alcohol due to

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Low density

High surface tension

Hydrogen bonding

High vapour pressure

Keeping in view the intermolecular forces of attraction, indicate which compound has the highest boiling point

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H₂S

HF

NH₃

H₂O

Which of the following is a metal

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Magnesium

Carbon

Hydrogen

Nitrogen

17th group elements ae known as

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Alkaki metals

Alkaline earth metals

Noble gases

Halogens

Number of isotopes of hydrogen is

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2

5

4

3

The boiling point of water is

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O ^oC

100 ^oC

35 ^oC

25 ^oC

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