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Chemistry Test 18

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Chemistry Test 18
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  • Question 1
    4 / -1

    Directions For Questions

    Statement 1: Compounds of hydrogen with N, O, F have high melting points and high boiling points.

    Statement 2: Intermolecular hydrogen bonds exist.

    ...view full instructions

    Which of the following statements is correct?

    Solution

    Due to small size and high electronegativity and presence of lone pair(s) of electrons, elements N, O, F when bonded to hydrogen atom, forms intermolecular hydrogen bonds which are stronger than other intermolecular forces. This results in exceptionally high melting and boiling points of the compounds.

  • Question 2
    4 / -1

    Which of the following is also referred as heavy hydrogen?

    Solution

    Deuterium is another name for heavy hydrogen. It differs from hydrogen in its nucleus, as it contains a neutron as well as a proton, making the atom extra heavier.

  • Question 3
    4 / -1

    Which of the following pair is not the isotopes of hydrogen?

    Solution

    Ortho and para hydrogen show different spins in a hydrogen molecule, so they are not isotopes of hydrogen.

  • Question 4
    4 / -1

    Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

    Solution

    The sulphates become less soluble om going down the group.

    Mg > Ca > Sr > Ba

    This is due to the decrease in hydration energy from Be2+ to Ba2+ as the size of the cation increase down the group. The significantly High solubility of MgSO4 is due to the high enthalpy of hydration of the smaller Mg2+ ions. However, the magnitude of lattice energy remains almost constant as the size of the sulphate ion is so big that small increase in the size of the cation from Be to Ba does not make any difference.

  • Question 5
    4 / -1

    Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

    Solution

    Li+ is smallest in size and therefore has maximum charge density.

    Among all the alkali metal ions, it is most heavily hydrated because the effective size of Li+ in aqueous solution is the largest. Therefore, Li+ will move the slowest under electric field.

  • Question 6
    4 / -1

    Which process is used in the preparation of sodium carbonate?

    Solution

    sodium carbonate is prepared by solvay process which exploits the low solubility of sodium hydrogen carbonate whereby it gets precipitated in the reaction of sodium chloride with ammonium hydrogen carbonate.

    The ammonium hydrogen carbonate is prepared by passing CO2 to a concentrated solution of sodium chloride saturated with ammonia, where ammonium carbonate followed ammonium hydrogen carbonate are formed.

    Sodium hydrogen carbonate crystals separate. These are heated to give sodium carbonate.

  • Question 7
    4 / -1

    What is the chemical formula of Quick lime?

    Solution

    calcium oxide is also called as quick lime. It is prepared on a commercial scale by heating limestone in a rotator kiln at 1070- 1270K.

  • Question 8
    4 / -1

    On heating gypsum above 393 K, the product formed is-

    Solution

    above 393 K, on heating gypsum no water of crystalline is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead blunt plaster’.

  • Question 9
    4 / -1

    What is the most important raw material used in the preparation of cement?

    Solution

    cement is obtained by combining CaO with clay, which contains silica, SiO2 along with oxides of aluminium, iron and magnesium. The average composition of Portland cement is- 

    CaO = 50 to 60%

    SiO2 = 20- 25%

    Al2O3 = 5-10%

    MgO = 2-3%

    Fe2O3 = 1-2%

    SO3 = 1-2%

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