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Chemistry Test-20

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Chemistry Test-20
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  • Question 1
    4 / -1

    Atomic number and mass number of an element \(\mathrm{M}\) are 25 and 52 respectively. The number of electrons, protons and neutrons in \(\mathrm{M}^{2+}\) ion are respectively.

    Solution

    In any chemical reaction, there is only a change in the number of electrons that occurs, the number of proton and neutron remains unchanged.

    In the formation of cation, electrons are removed.

    \({M} \rightarrow {M}^{2+}+2 {e}^{-}\)

    In the formation of anion, electrons are gained.

    \(M+2 e^{-} \rightarrow M^{2-}\)

    In any atom Atomic number (Z) = the number of protons.

    Z = P

    Atomic mass (A) = Number of Neutron + Number of proton.

    A = N + P

    In the formation of \(\mathrm{M}^{2+}\), two-electron removed.

    Number of electron \(=25-2=23\) electron.

    The number of proton \(=25\).

    Number of neutron \(=\mathrm{A}-\mathrm{Z}=52-25=27\).

    So, the number of electrons, protons and neutrons in \(\mathrm{M}^{2+}\) ion are respectively \({2 3}, {2 5}\) and \(27\).

  • Question 2
    4 / -1

    Which of the following is true for the resultant polymer product formed, when molecules of Phthalic acid react with molecules of glycerol?

    Solution

    The reaction between Phthalic acid and glycerol initially results into linear or branched polymer but, due to trifunctionality of glycerol, ultimately cross-linking takes place between the molecules.

  • Question 3
    4 / -1

    Which of the following is not malleable?

    Solution

    Graphite is not malleable.

    Malleability is the property of a metal by which it can be beaten into thin sheets without breaking or damaging it. Gold and silver are the most malleable metals on earth. Graphite is a non-metal, hence it is not malleable. Graphite is the only non-metal which conducts electricity.

  • Question 4
    4 / -1

    Modern periodic law was given by:

    Solution

    Modern periodic law was given by Mosley.

    Mosley gave the modern long form of Periodic table where the base of classification was the atomic number.According to Mosley's modern periodic law, the physical and chemical properties of elements are periodic functions of their Atomic number.

    In the long-form periodic table, Period \(1\) has two elements Hydrogen \((\mathrm{H})\) and Helium \((\mathrm{He})\).

    According to periodic law, there are seven periods in the periodic table and period 1 has two elements, \(2^{\text {nd }}\) and \(3^{\text {rd }}\) have 8 elements, \(4^{\text {th }}\) and \(5^{\text {th }}\) have \(18\) elements and \(6^{\text {th }}\) and \(7^{\text {th }}\) have \(32\) elements.

  • Question 5
    4 / -1

    In acid rain, SO2, sulphuric acid accounts for:

    Solution

    In acid rain, SO2, sulphuric acid accounts for 70%.

    Acid rain is caused by a chemical reaction. Basically, rain that has an unusually low pH is called acid rain. The most common chemicals that cause acid rain are sulphur oxides and nitric oxides. These substances rise high in the atmosphere where they react with water, oxygen and other chemicals to form more acidic pollutants. Sulphur dioxide in reaction with water and oxygen forms sulphur trioxide which is rapidly converted into sulphuric acid in presence of water. It accounts for 70% of the volume of acid rain.

  • Question 6
    4 / -1

    Which of the following is scientific explanation of depression?

    Solution

    The scientific explanation of depression can be defined as low levels of noradrenaline, a neurotransmitter in the blood lead to depression.

    • Noradrenaline is a neurotransmitter that plays a role in mood swings.
    • Low levels of noradrenaline lower the signal-sending activity and make the person suffers from depression.
  • Question 7
    4 / -1

    Actual flame temperature is always lower than the adiabatic flame temperature because there is ________.

    Solution

    Actual flame temperature is always lower than the adiabatic flame temperature because there isno possibility of obtaining complete combustion at a high temperature and there isalways a loss of heat from the flame.

    The constant volume adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any work, heat transfer or changes in kinetic or potential energy. The constant pressure adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any heat transfer or changes in kinetic or potential energy. Its temperature is lower than the constant volume process because some of the energy is utilized to change the volume of the system (i.e., generate work).

  • Question 8
    4 / -1

    Westron has the formula:

    Solution

    Westron has formula \(\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{Cl}_{4}\). It is also called\(1,1,2,2\)-tetrachloroethane.

    Westron is an organic compound in which there is a total of 8 elements. There are three elements that in different ratios form the Westron compound. There are carbon atoms, hydrogen atoms, and chlorine atoms are present. There are \(2\) atoms of carbon element, \(2\) atoms of hydrogen element, and \(4\) atoms of chlorine element.

  • Question 9
    4 / -1

    The reaction between carbon and oxygen can be represented as:

    \(\mathrm{C(s)+O_{2}(g) \rightarrow C_{2}(g)+}\) Heat

    In which of the following type(s) the above reaction can be classified?

    Solution

    Thegiven reaction can be classified as combustion reaction and combination reaction.

    \(\mathrm{C(s)+O_{2}(g) \rightarrow C_{2}(g)+}\) Heat

    A combustion reaction is the reaction in which a substance reacts with the presence of oxygen gas and which releases the amount of energy in the form of gas or light and heat is produced during the reaction. On the reactants side, we can see that solid carbon is burnt in presence of air oxygen. And on the product side we have received the energy as the gas carbon dioxide and the amount of heat is produced. Thus, here we can see the combustion reaction.

    In the above reaction, we can also observe that the carbon atom is with the oxygen to form the carbon dioxide. So, the combination reaction takes place.

    So, we can see that combustion reaction and the combination reaction takes place in this reaction.

  • Question 10
    4 / -1

    Which of the following pairs of 'polymer - its trade name' is correctly matched?

    Solution

    PAN and Orlon are correctly matched.Polyacrylonitrile or PAN, also known as polyvinyl cyanide and Creslan 61, is a synthetic, semicrystalline organic polymer resin. Though it is thermoplastic, it does not melt under normal conditions. It degrades before melting.

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