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1 : Which oxide is the most basic oxide?

1 : Na2O

2 : Li2O

3 : MgO

4 : CO

2 : Which group elements are the most reactive elements?

1 : Transition metal group

2 : First group

3 : Second group

4 : Third group

3 : In which element their exist strongest forces of attraction between atoms?

1 : Mg

2 : Ca

3 : Sr

4 : Ba

4 : X is a monatomic gas, which statement about this is correct?

1 : X burns in air

2 : X is coloured

3 : X is unreactive

4 : X will this place iodine from it

5 : Which halogen will have the least reactivity with alkaline earth metals?

1 : Chlorine

2 : Iodine

3 : Bromine

4 : Fluorine

6 : Which compound do you expect to be colored?

1 : KCI

2 : BaCi2

3 : AICI3

4 : NiCi2

7 : Which halogen acid is unstable at room temperature?

1 : HBr

2 : HI

3 : HCI

4 : HF

8 : Elements of which group are all colored?

1 : Second group

2 : 6th group

3 : 4th group

4 : Fifth group

9 : Which property is correct for group 1 elements?

1 : Low catalytic activity

2 : High density

3 : Low electrical conductivity

4 : High melting point

10 : As we move down the group in Group 1, the atomic size:

1 : Increases

2 : Decreases

3 : Remains the same

4 : First increases, then decreases

11 : Which of the following is the lightest alkali metal?

1 : Sodium

2 : Lithium

3 : Potassium

4 : Rubidium

12 : Which halogen exists as a liquid at room temperature?

1 : Fluorine

2 : Chlorine

3 : Bromine

4 : Iodine

13 : What is the colour of iodine at room temperature?

1 : Yellow

2 : Green

3 : Purple

4 : Red

14 : Which alkali metal forms a purple flame during a flame test?

1 : Sodium

2 : Lithium

3 : Potassium

4 : Rubidium

15 : Alkali metals react with water to produce:

1 : Hydrogen gas

2 : Carbon dioxide

3 : Oxygen gas

4 : Ammonia

16 : The most reactive halogen is:

1 : Fluorine

2 : Chlorine

3 : Bromine

4 : Iodine

17 : Halogens are non-metals because they:

1 : Have low melting points

2 : Form covalent bonds

3 : Gain electrons to form anions

4 : Are poor conductors

18 : Transition elements are good conductors of:

1 : Heat and electricity

2 : Only heat

3 : Only electricity

4 : Neither heat nor electricity

19 : Transition metals form coloured compounds because:

1 : They are radioactive

2 : They have unpaired d-electrons

3 : They have low melting points

4 : They dissolve in water

20 : Which is a characteristic property of transition metals?

1 : High reactivity

2 : Variable oxidation states

3 : Poor conductivity

4 : Low melting points

21 : Which noble gas is used in balloons?

1 : Neon

2 : Argon

3 : Helium

4 : Xenon

22 : Which transition metal is commonly used in jewelry?

1 : Iron

2 : Titanium

3 : Platinum

4 : Nickel

23 : Halogens react with hydrogen to form:

1 : Metal halides

2 : Hydrogen halides

3 : Oxides

4 : Sulfides

24 : The only liquid transition metal at room temperature is:

1 : Iron

2 : Copper

3 : Mercury

4 : Zinc

25 : Which group has elements that are all diatomic in nature?

1 : Group 1

2 : Group 17

3 : Group 18

4 : Transition elements

26 : Noble gases are chemically inert because:

1 : They are non-metals

2 : They have a full outer shell of electrons

3 : They have low boiling points

4 : They are found in air

Chemistry 9th MCQs || Ilam Ghar