Question 11 Mark
Write the names and formulae of (a) a metal hydride, and (b) a non-metal hydride.
Answer
View full question & answer→Sodium hydride,Hydrogen sulphide.
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Question 21 Mark
Write the electron-dot structures for the following molecules:
- NaCl
- Cl2
Answer
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Question 31 Mark
Write the electron arrangement in (i) a magnesium atom, and (ii) an oxygen atom.
Answer
View full question & answer→Magnesium = -2, 8, 2.
Oxygen = -2, 6.
Oxygen = -2, 6.
Question 41 Mark
Write the composition of the alloy called bronze. Give two uses of bronze.
Answer
View full question & answer→Bronze is an alloy of copper and tin; 90% copper and 10% tin. It is used for making statues and coins.
Question 51 Mark
Write equation for the reaction of:
- Sodium with oxygen.
- Magnesium with oxygen.
Answer
View full question & answer→-
$4\text{Na(s)}\ \ \ \ +\ \ \ \ \text{O}_2\text{(g)}\ \ \ \rightarrow\ \ \ 2\text{Na}_2\text{O(s)}\\\text{Sodium}\ \ \ \ \ \ \text{Oxygen}\ \ \ \ \ \ \text{Sodium oxide}\\\text{(Metal)}\ \ \ \ \ \text{(From air)}\ \ \ \text{(Basic oxide)}$
-
$2\text{Mg(s)}\ \ \ \ +\ \ \ \ \text{O}_2\text{(g)}\ \ \ \rightarrow\ \ \ 2\text{MgO}\text{(s)}\\\text{Megnisium}\ \ \ \ \ \ \text{Oxygen}\ \ \ \ \ \ \text{Megnesium oxide}\\\text{(Metal)}\ \ \ \ \ \ \ \ \ \text{(From air)}\ \ \ \ \ \ \ \ \text{(Basic oxide)}$
Question 61 Mark
Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion. (At. No. of S = 16)
Answer
View full question & answer→- E.C of S = 2, 8, 6
- E.C of S2- = 2, 8, 8
Question 71 Mark
Write down the electronic configuration of (i) sodium atom, and (ii) chlorine atom.
Answer
View full question & answer→- Sodium – 2, 8, 1
- Chlorine – 2, 8, 7
Question 81 Mark
Write down the electronic configuration of (i) magnesium atom, and (ii)magnesium ion. (At. No. of Mg = 12).
Answer
View full question & answer→- E.C of Mg = 2, 8, 2
- E.C of Mg2+ = 2, 8
Question 91 Mark
Write down the electron arrangement in (i) a magnesium atom, and (ii) a chlorine atom.
Answer
View full question & answer→- Magnesium: 2, 8, 2.
- Chlorine: 2, 8, 7.
Question 101 Mark
Write an equation of the reaction of iron with steam. Indicate the physical states of all the reactants and products.
Answer
View full question & answer→$3\text{Fe(s)}+4\text{H}_2\text{O(g)}\rightarrow2\text{Fe}_3\text{O}_4\text{(s)}+4\text{H}_2\text{(g)}$
Question 111 Mark
Why is sodium kept immersed in kerosene oil?
Answer
View full question & answer→Sodium is a very reactive metal so it reacts vigorously with the oxygen of air and catches fire. It is kept immersed in kerosene oil to protect it from the action of oxygen, moisture and carbon dioxide of air and to prevent accidental fires.
Question 121 Mark
Why is an iron grill painted frequently?
Answer
View full question & answer→An iron grill is painted frequently to prevent its rusting.
Question 131 Mark
Why do we apply paint on iron articles?
Answer
View full question & answer→Iron objects are painted so that air and moisture can not come in contact with the iron objects and hence no rusting takes place.
Question 141 Mark
Why does aluminium not react with water under ordinary conditions?
Answer
View full question & answer→Aluminium metal does not react with water under ordinary conditions because of the presence of a thin layer of aluminium oxide on its surface.
Question 151 Mark
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Answer
View full question & answer→Metals are electropositive elements because they can form positive ions by losing electrons.
Non-metals are electronegative elements because they can form negative ions by gaining electrons.
Non-metals are electronegative elements because they can form negative ions by gaining electrons.
Question 161 Mark
Why are ionic compounds usually hard?
Answer
View full question & answer→I onic compounds are usually hard because their oppositely charged ions attract one another strongly and form a regular crystal structure.
Question 171 Mark
Why are covalent compounds generally poor conductors of electricity?
Answer
View full question & answer→Covalent compounds are generally poor conductors of electricity because they do not contain ions.
Question 181 Mark
Which property of ‘solder’ alloy makes it suitable for welding electrical wires?
Answer
View full question & answer→Low melting point of solder makes it sutaible for welding electrical wires.
Question 191 Mark
Which property of iron metal is utilised in producing iron sheets required for making buckets?
Answer
View full question & answer→Malleability.
Question 201 Mark
Which property of graphite is utilised in making electrodes?
Answer
View full question & answer→Since graphite is a good conductor of electricity, it is used in making electrodes.
Question 211 Mark
Which property of copper metal is utilised in making thin wires?
Answer
View full question & answer→Ductility.
Question 221 Mark
Which property of copper and aluminium makes them suitable:
For making electric wires?
For making electric wires?
Answer
View full question & answer→High electrical conductivity.
Question 231 Mark
Which property of copper and aluminium makes them suitable:
For making cooking utensils and boilers?
For making cooking utensils and boilers?
Answer
View full question & answer→High thermal conductivity.
Question 241 Mark
Which of the two metals is more reactive : copper or silver?
Answer
View full question & answer→Copper.
Question 251 Mark
Which of the following compounds are ionic and which are covalent?
Urea, Cane sugar, Hydrogen chloride, Sodium chloride, Ammonium chloride, Carbon tetrachloride, Ammonia, Alcohol, Magnesium chloride.
Urea, Cane sugar, Hydrogen chloride, Sodium chloride, Ammonium chloride, Carbon tetrachloride, Ammonia, Alcohol, Magnesium chloride.
Answer
View full question & answer→Ionic compounds: Sodium chloride, Ammoniu m chloride, Magnesium chloride.
Covalent compounds:
Urea, Cane sugar, Hy drogen chloride, Carbon tetrachloride, Ammonia, Alcohol.
Covalent compounds:
Urea, Cane sugar, Hy drogen chloride, Carbon tetrachloride, Ammonia, Alcohol.
Question 261 Mark
Which of the following are amphoteric oxides:
MgO, ZnO, P2O2, Al2O , NO2
MgO, ZnO, P2O2, Al2O , NO2
Answer
View full question & answer→ZnO, Al2O3.
Question 271 Mark
Which non-metal has been placed in the reactivity series of metals?
Answer
View full question & answer→Hydrogen.
Question 281 Mark
Which metal is extracted from cinnabar ore?
Answer
View full question & answer→Mercury.
Question 291 Mark
Which metal is extracted from calamine ore?
Answer
View full question & answer→Zinc.
Question 301 Mark
Which metal is extracted from bauxite ore?
Answer
View full question & answer→Aluminium.
Question 311 Mark
Which metal foil is used for packing some of the medicine tablets?
Answer
View full question & answer→Aluminium foil.
Question 321 Mark
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Answer
View full question & answer→Silver metal becomes black in the presence of hydrogen sulphide gas in air.
Question 331 Mark
Which inert gas electron configuration do the Cl atoms in Cl2 molecule resemble ? What is this electron configuration?
Answer
View full question & answer→Argon; E.C = 2, 8, 8
Question 341 Mark
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Answer
View full question & answer→Hydrogen.
Question 351 Mark
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Answer
View full question & answer→Oxygen gas is produced; at anode (Positive electrode).
Question 361 Mark
What would be the electron-dot structure of carbon dioxide which has the formula CO2?
Question 371 Mark
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Answer
View full question & answer→When a strip of zinc metal is put in copper sulphate solution, then the blue colour of copper sulphate solution fades gradually and red brown coating of copper is deposited on zinc strip.
Question 381 Mark
What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?
Answer
View full question & answer→When a strip of copper metal is immersed in silver nitrate solution, the solution gradually becomes blue and a shining greyish-white deposit of silver metal is formed on copper strip.
Question 391 Mark
What type of chemical bonds are present in a solid compound which has a high melting point, does not conduct electricity in the solid state but becomes a good conductor in the molten state?
Answer
View full question & answer→Ionic bonds.
Question 401 Mark
What type of chemical bond is present in chlorine molecule ? Explain your answer.
Answer
View full question & answer→Covalent bond ; Because whenever two atoms of the same element combine to form a molecule, a covalent bond is formed.
Question 411 Mark
What type of chemical bond is formed between:
Potassium and bromine?
Potassium and bromine?
Answer
View full question & answer→Ionic bond.
Question 421 Mark
What type of chemical bond is formed between:
Carbon and bromine?
Carbon and bromine?
Answer
View full question & answer→Covalent bond.
Question 431 Mark
What type of bonds are present in water molecule? Draw the electron-dot structure of water (H2O).
Question 441 Mark
What type of bonds are present in the following molecules? Draw their electron-dot structures.
- H2
- CH4
- Cl2
- O2
Answer
View full question & answer→
Question 451 Mark
What type of bonds are present in methane (CH4) and sodium chloride (NaCl)?
Answer
View full question & answer→Methane: Covalent bonds
Sodium chloride: Ionic bonds
Sodium chloride: Ionic bonds
Question 461 Mark
What type of bonds are present in hydrogen chloride and oxygen?
Answer
View full question & answer→Covalent bond.
Question 471 Mark
What special name is given to substances like aluminium oxide.
Answer
View full question & answer→Amphoteric oxides.
Question 481 Mark
What name is given to those metal oxides which show basic as well as acidic behaviour?
Answer
View full question & answer→Amphoteric oxides.
Question 491 Mark
What is the number of outermost electrons in (i) a sodium atom, and (ii) an oxygen atom?
Answer
View full question & answer→- 1
- 6
Question 501 Mark
What is the nature of charge on (i) a cation, and (ii) an anion?
Answer
View full question & answer→- Positive charge.
- Negative charge.