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Download WorksheetA cyclist starts from rest. The power delivered by him varies with time as P=2t. The kinetic energy after 4 s is:
8J
2.16J
3.32J
4.64J
The potential energy of a system is U(x)=4x^2. The force at x=3 is:
12N
2.-12N
3.24N
4.-24N
A body of mass mmm moving with velocity vvv collides elastically with another identical body at rest. After collision, the first body comes to rest. The KE of system after collision is:
0
2.1/4mv$\frac{mv^2}{4}$
3.1/2mv$\frac{mv^2}{4}$
4.$mv^2$
Assertion: Carbonates are polyatomic ions.
Reason: The carbonate ion consists of one carbon atom and three oxygen atoms and carries an overall charge of.
Both assertion and reason are true and reason is the correct explanation of assertion.
2.Both assertion and reason are true but reason is not the correct explanation of asserti
3.Assertion is true but reason is false.
4.Assertion is false but reason is true
Assertion : Number of gram-molecules of SO2Cl2 in 13.5 g of sulphur chloride is 0.1.
Reason : Gram molecular mass is equal to two gram molecule.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
2.(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
3.(c) Assertion is true but reason is false.
4.(d) Assertion is false but reason is true
A mole of an atom is a collection of atoms whose total mass is the number of grams equal to the
atomic mass. Since equal number of moles of different elements contain an equal number of atoms it becomes convenient to express the amounts of the elements in terms of moles. A mole represents a definite number of particles viz, atoms, molecules, ions or electrons. This definite number is called Avogadro number or Avogadro constant which is equal to 6.022 × 1023. Hence a mole represents 6.022 × 1023 particles of the substance. One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres.
(iv) What is the mass in grams of 2.42 mol of zinc? (Atomic mass of Zn = 65.41)
(a) 200 g
2.(b) 25 g
(c) 85 g
4.(d) 158 g
A mole of an atom is a collection of atoms whose total mass is the number of grams equal to the
atomic mass. Since equal number of moles of different elements contain an equal number of atoms it becomes convenient to express the amounts of the elements in terms of moles. A mole represents a definite number of particles viz, atoms, molecules, ions or electrons. This definite number is called Avogadro number or Avogadro constant which is equal to 6.022 × 1023. Hence a mole represents 6.022 × 1023 particles of the substance. One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres.
(iii) How many number of moles are there in 5.75 g of sodium ? (Atomic mass of sodium = 23)
(a) 0.25
2.(b) 0.5
(c) 1
4.(d) 2.5
Read the following and answer any four questions from (i) to (iv).
A mole of an atom is a collection of atoms whose total mass is the number of grams equal to the
atomic mass. Since equal number of moles of different elements contain an equal number of atoms it becomes convenient to express the amounts of the elements in terms of moles. A mole represents a definite number of particles viz, atoms, molecules, ions or electrons. This definite number is called Avogadro number or Avogadro constant which is equal to 6.022 × 1023. Hence a mole represents 6.022 × 1023 particles of the substance. One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres.
(ii) What is the mass in grams of a single atom of chlorine? (Atomic mass of chlorine = 35.5)
(a) 6.54 × 1023 g
2.(b) 5.9 × 10–23 g
(c) 0.0025 g
4.(d) 35.5 g
Read the following and answer any four questions from (i) to (iv).
A mole of an atom is a collection of atoms whose total mass is the number of grams equal to the
atomic mass. Since equal number of moles of different elements contain an equal number of atoms it becomes convenient to express the amounts of the elements in terms of moles. A mole represents a definite number of particles viz, atoms, molecules, ions or electrons. This definite number is called Avogadro number or Avogadro constant which is equal to 6.022 × 1023. Hence a mole represents 6.022 × 1023 particles of the substance. One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres.
i) How many grams of sodium must be taken to get 1 mole of the element ?
23 g
2.35.5 g
3.63.5 g
4.46 g
0.25 mole of H2will contain grams of H2SO4
24.5
2.25.4
3.2.45
4.0.245
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