Chemistry
Grade-9
Easy
Question
Why do the balloons filled with helium move up to the sky?
- They float due to the helium's inert properties.
- Fluorine-based rubber in the balloon reacts with helium to produce the buoyancy.
- The helium gas floats because its weight is too low.
- All of the above
Hint:
Helium is lighter than air.
The correct answer is: The helium gas floats because its weight is too low.
- Helium is called 'lighter than air gas' as it is less denser than air.
- When balloons are filled with helium gas it rises because of a force buoyancy.
- Hence, the balloons filled with helium move up to the sky.
Related Questions to study
Chemistry
What is a halogen that is solid at room temperature?
- Cl
- Br
- F
- I
What is a halogen that is solid at room temperature?
ChemistryGrade-9
- Cl
- Br
- F
- I
Chemistry
The true statement among the following is:
- The reactive nature of Halogens increases from top to bottom of the table.
- The reactive nature for Halogens decreases from top to bottom of the table.
- Halogens are incapable of reacting with metals.
- Fluorine is the most abundant element on the earth's crust.
The true statement among the following is:
ChemistryGrade-9
- The reactive nature of Halogens increases from top to bottom of the table.
- The reactive nature for Halogens decreases from top to bottom of the table.
- Halogens are incapable of reacting with metals.
- Fluorine is the most abundant element on the earth's crust.
Chemistry
When Be is converted into Be2+ it shows the configuration of which noble gas?
- Kr
- Ar
- He
- Xe
When Be is converted into Be2+ it shows the configuration of which noble gas?
ChemistryGrade-9
- Kr
- Ar
- He
- Xe
Chemistry
Which of these is not a property of Noble Gases?
- Colourless
- Odourless
- Flammable
- Gas at room temperature
Which of these is not a property of Noble Gases?
ChemistryGrade-9
- Colourless
- Odourless
- Flammable
- Gas at room temperature
Chemistry
How many electrons do the Halogens all have in their outer shells?
- 5
- 6
- 7
- 8
How many electrons do the Halogens all have in their outer shells?
ChemistryGrade-9
- 5
- 6
- 7
- 8
Chemistry
Alkaline earth Metals conduct heat and electricity.
- True
- False
Alkaline earth Metals conduct heat and electricity.
ChemistryGrade-9
- True
- False
Chemistry
Alkali Metals are brittle.
- True
- False
Alkali Metals are brittle.
ChemistryGrade-9
- True
- False
Chemistry
Alkaline earth metals are fairly reactive metals because they only have 2 valence electrons.
- True
- False
Alkaline earth metals are fairly reactive metals because they only have 2 valence electrons.
ChemistryGrade-9
- True
- False
Chemistry
Alkaline earth metals are very dense compared to alkali metals.
- True
- False
Alkaline earth metals are very dense compared to alkali metals.
ChemistryGrade-9
- True
- False
Chemistry
All elements in the same group have the same number of ___.
- Protons
- Neutrons
- Atomic mass units
- Valence electrons
All elements in the same group have the same number of ___.
ChemistryGrade-9
- Protons
- Neutrons
- Atomic mass units
- Valence electrons
Chemistry
What colour does Ba's flame typically have?
- Apple Green
- White
- Azure
- Bright orange
What colour does Ba's flame typically have?
ChemistryGrade-9
- Apple Green
- White
- Azure
- Bright orange
Chemistry
Which Group 1 elements exhibit a lilac flame colour?
- Li
- Na
- K
- Rb
Which Group 1 elements exhibit a lilac flame colour?
ChemistryGrade-9
- Li
- Na
- K
- Rb
Chemistry
What is the symbol for magnesium ?
- Mg
- Mn
- Md
- Fe
What is the symbol for magnesium ?
ChemistryGrade-9
- Mg
- Mn
- Md
- Fe
Chemistry
Ca is the symbol for:
- Carbon
- Chlorine
- Calcium
- Cesium
Ca is the symbol for:
ChemistryGrade-9
- Carbon
- Chlorine
- Calcium
- Cesium
Chemistry
Be is the symbol for:
- Bromine
- Beryllium
- Boron
- Berkelium
Be is the symbol for:
ChemistryGrade-9
- Bromine
- Beryllium
- Boron
- Berkelium