NEET
Practice Test 4
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The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are

  • Solution

    Alkaline pyrogallol absorbs O2 and oil of cinnamon absorbs O3.

Nitrogen is obtained by the thermal decomposition of :

  • Solution

    Nitrogen is obtained by the thermal decomposition of

    NH4NO2

    NH4NO2 \(\overset{\Delta }{\rightarrow}\) N2 + 2H2O

The number of P – O – P bonds in cyclic metaphosphoric acid is

  • Solution

    In cyclic metaphosporic acid number of P–O–P bonds is three.

The number of P – O – P bonds in cyclic metaphosphoric acid is

  • Solution

    Group 16, elements are known as Chalcogens Na is not group 16 element. So it is not Chalcogen.

One mole of calcium phosphide on reaction with excess water gives

  • Solution

    Ca3P2+ 6H2O → 3Ca(OH)2+ 2PH
    3; i.e 2 moles of phosphine are produced from one mole of calcium phosphide.

Which of the following oxides of nitrogen is a coloured gas?

  • Solution

    NO2 is reddish brown coloured gas. Rest of the oxides are colourless.

The bonds present in N2O5are:

  • Solution

    The structure clearly shows the presence of covalent and co-ordinate bonds.

Onemole of magnesium nitride on reaction with an excess of water gives

  • Solution

    \(\underset{1\, mol}{Mg_{3}N_{2}}+\underset{(excess)}{6H_{2}O}\rightarrow 3Mg(OH)_{2}+\underset{2\, mol}{2NH_{3}}\)

The sides of safety matches contains :

  • Solution

    The sides of safety matches contain red phosphorus and sand powder.

Nitrogen is obtained when NaNO2 reacts with :

  • Solution

    NH4Cl + NaNO2 \(\overset{\Delta }{\rightarrow}\) NH4NO2 + NaCl

    NH4NO2\(\overset{\Delta }{\rightarrow}\)N2 + 2H2O

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THE p-BLOCK ELEMENTS(Group 15, 16, 17 and 18)
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