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Class 9 Chemistry Fundamentals Of Chemistry 13. State the nature and name of the substance formed by combining the following:i. Zinc+Copper


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13. State the nature and name of the substance formed by combining the following:i. Zinc+Copper

11. How many number of moles are equivalent to 8 grams of \mathrm{Co}_{2} ?(a) 0.15 (b) 0.18 (c) 0.21 (d) 0.24
11. How many number of moles are equivalent to 8 grams of  \mathrm{Co}_{2}  ?(a)  0.15 (b)  0.18 (c)  0.21 (d)  0.24

11. How many number of moles are equivalent to 8 grams of \mathrm{Co}_{2} ?(a) 0.15 (b) 0.18 (c) 0.21 (d) 0.24

6 . What will be the mass of 2.05 \times 10^{16} molecules of \mathrm{H}_{2} \mathrm{SO}_{4}
 6 . What will be the mass of  2.05 \times 10^{16}  molecules of  \mathrm{H}_{2} \mathrm{SO}_{4}

6 . What will be the mass of 2.05 \times 10^{16} molecules of \mathrm{H}_{2} \mathrm{SO}_{4}

There are 3.01 \times 10^{23} molecules of \mathrm{CO}_{2} present in a container. Calculate the number of moles and its mass.
There are  3.01 \times 10^{23}  molecules of  \mathrm{CO}_{2}  present in a container. Calculate the number of moles and its mass.

There are 3.01 \times 10^{23} molecules of \mathrm{CO}_{2} present in a container. Calculate the number of moles and its mass.

3. The most abundant element occurring in the oceans is:(a) oxygen(b) hydrogen (c) nitrogen(d) silicon
3. The most abundant element occurring in the oceans is:(a) oxygen(b) hydrogen (c) nitrogen(d) silicon

3. The most abundant element occurring in the oceans is:(a) oxygen(b) hydrogen (c) nitrogen(d) silicon

7 . State three reasons why do you think air is a mixture and water a compound?
 7 . State three reasons why do you think air is a mixture and water a compound?

7 . State three reasons why do you think air is a mixture and water a compound?

Calculate the gram molecule (number of moles) in 40 \mathrm{~g} of \mathrm{H}_{3} \mathrm{PO}_{\alpha} .
Calculate the gram molecule (number of moles) in  40 \mathrm{~g}  of  \mathrm{H}_{3} \mathrm{PO}_{\alpha} .

Calculate the gram molecule (number of moles) in 40 \mathrm{~g} of \mathrm{H}_{3} \mathrm{PO}_{\alpha} .

6. One amu (atomic mass unit) is equivalent to:(a) 1.66 \times 10^{-24} \mathrm{mg} (b) 1.66 \times 10^{-24} \mathrm{~g} (c). 1.66 \times 10^{-24} \mathrm{~kg} (d) 1.66 \times 10^{-23} \mathrm{~g}
6. One amu (atomic mass unit) is equivalent to:(a)  1.66 \times 10^{-24} \mathrm{mg} (b)  1.66 \times 10^{-24} \mathrm{~g} (c).  1.66 \times 10^{-24} \mathrm{~kg} (d)  1.66 \times 10^{-23} \mathrm{~g}

6. One amu (atomic mass unit) is equivalent to:(a) 1.66 \times 10^{-24} \mathrm{mg} (b) 1.66 \times 10^{-24} \mathrm{~g} (c). 1.66 \times 10^{-24} \mathrm{~kg} (d) 1.66 \times 10^{-23} \mathrm{~g}

13. State the nature and name of the substance formed by combining the following:i. Zinc+Copper
13. State the nature and name of the substance formed by combining the following:i. Zinc+Copper
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13. State the nature and name of the substance formed by combining the following:i. Zinc+Copper

4. Which one of the following elements is found in most abundance in the Earths crust?(a) oxygen(b) aluminium (c) silicon(d) iron
4. Which one of the following elements is found in most abundance in the Earths crust?(a) oxygen(b) aluminium (c) silicon(d) iron

4. Which one of the following elements is found in most abundance in the Earths crust?(a) oxygen(b) aluminium (c) silicon(d) iron

Example 1.1 How many protons and neutrons are there in an atom having A=238 and Z=92 .
Example  1.1 How many protons and neutrons are there in an atom having  A=238  and  Z=92 .

Example 1.1 How many protons and neutrons are there in an atom having A=238 and Z=92 .

Calculate the number of moles number of molecules and number of atoms present in 6 grams of water:
Calculate the number of moles number of molecules and number of atoms present in 6 grams of water:

Calculate the number of moles number of molecules and number of atoms present in 6 grams of water:

13. State the nature and name of the substance formed by combining the following:ii. Water + Sugar
13. State the nature and name of the substance formed by combining the following:ii. Water  +  Sugar

13. State the nature and name of the substance formed by combining the following:ii. Water + Sugar

7 . How many atoms are required to prepare 60 \mathrm{~g} of \mathrm{HNO}_{3} ?
 7 . How many atoms are required to prepare  60 \mathrm{~g}  of  \mathrm{HNO}_{3}  ?

7 . How many atoms are required to prepare 60 \mathrm{~g} of \mathrm{HNO}_{3} ?

10 . State the reasons: soft drink is a mixture and water is a compound.
 10 . State the reasons: soft drink is a mixture and water is a compound.

10 . State the reasons: soft drink is a mixture and water is a compound.

5. The third abundant gas found in the Earths atmosphere is:(a) carbon monoxide(b) oxygen.(c) nitrogen(d) argon
5. The third abundant gas found in the Earths atmosphere is:(a) carbon monoxide(b) oxygen.(c) nitrogen(d) argon

5. The third abundant gas found in the Earths atmosphere is:(a) carbon monoxide(b) oxygen.(c) nitrogen(d) argon

4. Calculate the number of molecules in the following compounds:b. 20 \mathrm{~g} of \mathrm{HNO}_{3}
4. Calculate the number of molecules in the following compounds:b.  20 \mathrm{~g}  of  \mathrm{HNO}_{3}

4. Calculate the number of molecules in the following compounds:b. 20 \mathrm{~g} of \mathrm{HNO}_{3}

2. Which one of the following compounds can be separated by physical means?(a) mixture(b) element(c) compound(d) radical
2. Which one of the following compounds can be separated by physical means?(a) mixture(b) element(c) compound(d) radical

2. Which one of the following compounds can be separated by physical means?(a) mixture(b) element(c) compound(d) radical

You have a piece of coal (carbon) weighing 9.0 gram. Calculate the number of moles of coal in the given mass.
You have a piece of coal (carbon) weighing  9.0  gram. Calculate the number of moles of coal in the given mass.

You have a piece of coal (carbon) weighing 9.0 gram. Calculate the number of moles of coal in the given mass.

8. Explain why are hydrogen and oxygen considered elements whereas water as a compound.
8. Explain why are hydrogen and oxygen considered elements whereas water as a compound.
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8. Explain why are hydrogen and oxygen considered elements whereas water as a compound.

1. Industrial chemistry deals with the manufacturing of compounds:(a) in the laboratory(b) on micro scale(c) on commercial scale(d) on economic scale
1. Industrial chemistry deals with the manufacturing of compounds:(a) in the laboratory(b) on micro scale(c) on commercial scale(d) on economic scale
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1. Industrial chemistry deals with the manufacturing of compounds:(a) in the laboratory(b) on micro scale(c) on commercial scale(d) on economic scale

Differentiate between the following with examples:iii. Molecular mass and molar mass
Differentiate between the following with examples:iii. Molecular mass and molar mass
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Differentiate between the following with examples:iii. Molecular mass and molar mass

13. Which one of the following pairs has the same mass?(a) 1 mole of \mathrm{CO} and 1 mole of \mathrm{N}_{2} (b) 1 mole of \mathrm{CO} and 1 mole of \mathrm{CO}_{2} (c) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{N}_{2} (d) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{Co}_{2}
13. Which one of the following pairs has the same mass?(a) 1 mole of  \mathrm{CO}  and 1 mole of  \mathrm{N}_{2} (b) 1 mole of  \mathrm{CO}  and 1 mole of  \mathrm{CO}_{2} (c) 1 mole of  \mathrm{O}_{2}  and 1 mole of  \mathrm{N}_{2} (d) 1 mole of  \mathrm{O}_{2}  and 1 mole of  \mathrm{Co}_{2}
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13. Which one of the following pairs has the same mass?(a) 1 mole of \mathrm{CO} and 1 mole of \mathrm{N}_{2} (b) 1 mole of \mathrm{CO} and 1 mole of \mathrm{CO}_{2} (c) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{N}_{2} (d) 1 mole of \mathrm{O}_{2} and 1 mole of \mathrm{Co}_{2}

9. The molar mass of \mathrm{H}_{2} \mathrm{SO}_{4} is:(a) 98 \mathrm{~g} (b) 98 \mathrm{amu} (c) 9.8 \mathrm{~g} (d) 9.8 \mathrm{amu}
9. The molar mass of  \mathrm{H}_{2} \mathrm{SO}_{4}  is:(a)  98 \mathrm{~g} (b)  98 \mathrm{amu} (c)  9.8 \mathrm{~g} (d)  9.8 \mathrm{amu}
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9. The molar mass of \mathrm{H}_{2} \mathrm{SO}_{4} is:(a) 98 \mathrm{~g} (b) 98 \mathrm{amu} (c) 9.8 \mathrm{~g} (d) 9.8 \mathrm{amu}

11. Classify the following into element compound or mixture:i. He and \mathrm{H}_{2}
11. Classify the following into element compound or mixture:i. He and  \mathrm{H}_{2}
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11. Classify the following into element compound or mixture:i. He and \mathrm{H}_{2}

8. The mass of one molecule of water is:(a) 18 \mathrm{amu} (b) 18 \mathrm{~g} (c) 18 \mathrm{mg} (d) 18 \mathrm{~kg}
8. The mass of one molecule of water is:(a)  18 \mathrm{amu} (b)  18 \mathrm{~g} (c)  18 \mathrm{mg} (d)  18 \mathrm{~kg}
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8. The mass of one molecule of water is:(a) 18 \mathrm{amu} (b) 18 \mathrm{~g} (c) 18 \mathrm{mg} (d) 18 \mathrm{~kg}

11. Classify the following into element compound or mixture:iv. Gold and brass
11. Classify the following into element compound or mixture:iv. Gold and brass
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11. Classify the following into element compound or mixture:iv. Gold and brass

14. Differentiate between molecular mass and formula mass which of the followings have molecular formula?\[\mathrm{H}_{2} \mathrm{O} \mathrm{NaCl} \mathrm{KI} \mathrm{H}_{2} \mathrm{SO}_{4}\]
14. Differentiate between molecular mass and formula mass which of the followings have molecular formula?\[\mathrm{H}_{2} \mathrm{O} \mathrm{NaCl} \mathrm{KI} \mathrm{H}_{2} \mathrm{SO}_{4}\]
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14. Differentiate between molecular mass and formula mass which of the followings have molecular formula?\[\mathrm{H}_{2} \mathrm{O} \mathrm{NaCl} \mathrm{KI} \mathrm{H}_{2} \mathrm{SO}_{4}\]

9 . How many molecules of HC1 will be required to have 10 grams of it?
 9 . How many molecules of HC1 will be required to have 10 grams of it?
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9 . How many molecules of HC1 will be required to have 10 grams of it?

Differentiate between the following with examples:iv. Chemical formula and gram formula
Differentiate between the following with examples:iv. Chemical formula and gram formula
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Differentiate between the following with examples:iv. Chemical formula and gram formula

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