9th Class Chemistry Guess
Questions # 1
- Give two properties of neutrons.
- How many neutrons are present in C-12 and C-13?
- Do you know any element having no neutrons in its atoms?
Questions # 2
- Why the second ionization energy of an element is higher than first one?
- What do you mean by blocks in a periodic table and why elements were placed in blocks?
- For an element Z = 92, A = 238. Calculate the number of electron and proton in it.
- What is the definition of the element according to the Robert Boyle?
- What is the significance of the symbol of an element?
- Define Boyle’s Law and verify with an example.
- What type of elements from metallic bond?
- Define Avogadro’s number.
- Which element has the highest electro negativity?
- What type of elements have tendency of sharing of electrons?
- Why and how elements arranged in a period?
- What type of elements are metals?
- Write down the names of elements of group 1 with their symbols?
- Define Boyle’s rule?
Questions # 3
- Write two chemical properties of metals and non-metals.
- Define metal, give two examples.
- Write down the name of four least reactive metals.
- Compare any four physical properties of metals and non-metals.
- What are important physical characteristics of metals?
- Why reactivity of metals increase drown the group?
- How non-metals are essential part of our body structure?
- Which metal is used for metal work?
- State the physical properties of metals
- What is the trend of variation it densities of alkali metals?
- Metals are good conductor of electricity. Why?
- What are transition metals?
- How oxygen reacts with group II A metals?
Questions # 4
- Why silver and gold are least reactive?
- Give properties and uses of gold?
- Which is lighter than aluminum of gold?
- Give the applications of silver. Why platinum is used for making Jewellery?
- Can pure gold be used for making electrical wires?
Questions # 5
- Give the Properties of dipole-dipole forces.
- Define dipole interactions. How are they created?
Questions # 6
- Write down any two properties of canal rays.
- Give two properties of positive rays.
- Write down two properties, of cathode rays.
- What conclusion you derive from these properties.
- How are cathode rays produced?
- What is the nature of charge on cathode rays?
- What are its five major characteristics?
Questions # 7
- Define atomic mass unit. Why is it needed?
- Define atomic number and mass number.
- What are SI units of atomic radius?
- Define Tri-atomic and Hetero-atomic.
- Why do atoms react?
- How can you define atomic radius?
- What is Luther Meyer’s atomic volume curve?
- What is meant by atomic size? Write its unit.
- What are the salient features of Rutherford’s atomic model?
- How Rutherford discovered that atom has a nucleus located at the centre of the atom?
- What are the defects of Rutherford atomic model?
- Give two postulates of Bohr’s atomic theory.
- How it is related to gram?
- What is the relative atomic mass?
- Find out the mass of 3 moles of oxygen atoms.
- Why the size of atom decreases in a period?
- How to atoms follow octet rule?
- What is trend of atomic radius in period and group?
- Calculate the number of atoms in 10 grams of Aluminum (Al).
- Differentiate between Homo atomic and Hetero atomic molecules.
- How is periodicity of properties dependent upon number of protons in an atom?
- Calculate the number of moles, number of molecule atoms present in 6 grams of water.
- How was it proved that electrons are fundamental particles of an atom?
- Give basic postulates of Bohr’s atomic theory.
- Give the electronic configuration of carbon atom.
Questions # 8
- Give the physical properties of sodium and its uses.
- Write any two uses of sodium.
- Why does sodium make ionic bond with chlorine?
- Why does sodium forma chemical bound with chloride?
- Why magnesium is harder than sodium.
Questions # 9
- Write down two uses of calcium.
- Give physical properties of calcium and its uses.
- Why calcium is more electropositive tan to magnesium?
- Write the chemical formulae of Aluminium Sulphate and Calcium Phosphate.
Questions # 10
- Define and explain Charles’s Law of gasses.
- Whether the density of gases increases on cooling? Explain.
- Why are the densities of gases lower than that of liquids?
- Why the gases are compressible?
- Why noble gases are not reactive?
- Can you cool a gas by increasing it volume?
Questions # 11
- What is meant by volume / volume %?
- What do you mean by %-mass / mass?
- Give the example and formula of mass by volume percent.
- There are 3.01 x 1023 molecules of CO2 present in a container.
- Calculate the number of moles of coal in the given mass.
- Calculate the number of moles and its mass. You have a piece of coal (carbon) weighing 9.0 grams.
- How can you differentiate between molecular formula, formula mass and empirical formula?
- Calculate the number of moles of coal in the given mass.
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