Question # 1

Atomic number of lanthanum is

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57

58

59

60

Dative covalent bondis also known as

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Covalent bond

Ionic Bond

Metallic Bond

Coordinate covalent bond

d- subshell can accommodate maximum electrons.

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2

6

10

14

Number of isotopes of hydrogen is

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2

5

4

3

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

In which period and group yu will place the elemnt whic is an important part of the solar cell?

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Third period and Sixth a grop Group 16

Third priod and forth A group Group 14

Second period and forth A group Group

Third prod and fifth A group Group 15

A nceklaee has 6 g of diamonds in it . What are the numberof carbon atoms in it?

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3.01 x 10²³

1.003 x 10²³

12.04 x 10²³

6.02 x 10²³

The branch of science helps to understand chemcial product andprocess that reduce the use of hazadous substances.

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Green chemistry

Astrochemistry

Analytical chemistry

Physical Chemistry

Whcih one of the following in as electron deficient molecule.

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NH3

O2

BF3

N2

The electropositive elements have the tendency to

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Lose electrons

Gain electrons

Share electrons

All of these

Mixture can be separated by means of

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Nuclear method

Phyical medhod

Chemical Method

All of these

How many covalent bonds do N2 molecule have

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3

4

2

5

A compound with chemicla formula Na₂CX₃ has formula mass 106 ami. Atomicmass of the elemetn X is.

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16

23

12

106

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