Q2) Draw the basic structure of an atom representing its - (a) Subatomic particles (b) Nucleus (c) Orbits or shells.
Q3) In the modern periodic table - atoms of all elements are arranged according to their increasing order of - the atomic number. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Q4) State the main points of the contradiction of Dalton’s atomic theory by the modern atomic theory.
Q5) ‘Atoms of the same element or different of Dalton’s atomic theory by the modern atomic theory’. Give two examples each of =-
Q6) Explain the term - ‘atomicity’. Give a reason why -
Q8) A radical takes part - unsplit in a chemical reaction and retains its identity in reactions. With reference to the radical - (a) Ammonium (b) bisulphate (c) Carbonate - state the group of atoms present in each radical.
Q9) Differentiate between the following with suitable examples - A basic radical and an acid radical.
Q11) Explain the term - ‘valency’. State giving reasons the valency of -
Q12) Give the symbols and valency of the following elements and radicals.
Q14. State what is meant by the term - ‘chemical formula’. Give the chemical formula of -
a) Sodium hydroxide
b) Sodium nitrate
c) Sodium bicarbonate
d) Sodium sulphite
e) Magnesium nitrate
f) Ammonium sulphate
g) Carbonic acid
h) Calcium phosphate
Q15) Dilute hydrochloric acid is added to sodium hydroxide’. Give a word equation and a molecular equation of the same. Is the equation written, a balanced equation. Give reasons.
Q1) Fill in the blanks with the correct words from the brackets.
Q2) Select the correct answer from A,B,C,D and E for each statement given below:
A: Molecule B: Orbits C: Atom D: Valency E: Radical
Q3) Match the radicals in List I with their correct names from List II
|List I||List II|
|1. [[> widget id="1" <]]||A: BIsulphite||F: Sulphate|
|2. [[> widget id="2" <]]||B: Phosphate||G: Nitrate|
|3. [[> widget id="3" <]]||C: Carbonate||H: Phosphite|
|4. [[> widget id="4" <]]||D: Nitrite||I: Sulphite|
|5. [[> widget id="5" <]]||E: Bicarbonate||J: Bisulphate|
Q4) State the correct formula of the following from the list given:
Q5) Name the following
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