131. On heating with concentrated $$NaOH$$ solution in an inert atmosphere of $$C{O_2},$$ white phosphorus gives a gas. Which of the following statements is incorrect about the gas?
A.
It is highly poisonous and has smell like rotten fish.
B.
Its solution in water decomposes in the presence of light.
C.
It is more basic than $$N{H_3}.$$
D.
It is less basic than $$N{H_3}.$$
Answer :
It is more basic than $$N{H_3}.$$
132. Which of the following has the minimum heat of dissociation :
A.
$${\left( {C{H_3}} \right)_3}N: \to B{F_3}$$
B.
$${\left( {C{H_3}} \right)_3}N: \to B{\left( {C{H_3}} \right)_2}F$$
C.
$${\left( {C{H_3}} \right)_3}N: \to B{\left( {C{H_3}} \right)_3}$$
D.
$${\left( {C{H_3}} \right)_3}N: \to B\left( {C{H_3}} \right){F_2}$$
Answer :
$${\left( {C{H_3}} \right)_3}N: \to B{\left( {C{H_3}} \right)_3}$$
133. Hydrolysis of one mole of peroxodisulphuric acid produces
A.
two moles of sulphuric acid.
B.
two moles of peroxomonosulphuric acid.
C.
one mole of sulphuric acid and one mole of peroxomonosulphuric acid.
D.
one mole of sulphuric acid, one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.
Answer :
one mole of sulphuric acid and one mole of peroxomonosulphuric acid.
134. Oganesson has been synthetically produced by collision of
A.
$$Ra\,\,{\text{and}}\,\,Ca$$
B.
$$Cf\,\,{\text{and}}\,\,Ca$$
C.
$$Cf\,\,{\text{and}}\,\,Cu$$
D.
$$Ra\,\,{\text{and}}\,\,He$$
Answer :
$$Cf\,\,{\text{and}}\,\,Ca$$
135. Boron is unable to form $$BF_6^{3 - }$$ ions due to
A.
non - availability of $$d$$ - orbitals
B.
small size of boron atom
C.
non - metallic nature
D.
less reactivity towards halogens
Answer :
non - availability of $$d$$ - orbitals
136. Sulphur trioxide is not directly dissolved in water to form sulphuric acid because
A.
$$S{O_3}$$ does not react with water to form acid
B.
$$S{O_3}$$ gets oxidised to $${H_2}S{O_3}$$ when dissolved in water
C.
it results in the formation of dense fog of sulphuric acid which is difficult to condense
D.
sulphur trioxide is insoluble in water due to its covalent nature
Answer :
it results in the formation of dense fog of sulphuric acid which is difficult to condense
137. Which of the following oxides is acidic in nature?
A.
$${B_2}{O_3}$$
B.
$$A{l_2}{O_3}$$
C.
$$G{a_2}{O_3}$$
D.
$$I{n_2}{O_3}$$
Answer :
$${B_2}{O_3}$$
138. Oxidation number of $$Cl\,\,{\text{in}}\,CaOC{l_2}$$ (bleaching powder) is:
A.
zero, since it contains $$C{l_2}$$
B.
$$ - 1,$$ since it contains $$Cl$$
C.
$$ + 1$$, since it contains $$Cl{O^ - }$$
D.
$$ + 1\,{\text{and}}\, - 1$$ since it contains $$Cl{O^ - }\,{\text{and}}\,C{l^ - }$$
Answer :
$$ + 1\,{\text{and}}\, - 1$$ since it contains $$Cl{O^ - }\,{\text{and}}\,C{l^ - }$$
139. What are the products formed in the reaction of xenon hexafluoride with silicon dioxide ?
A.
$$XeSi{O_4} + HF$$
B.
$$Xe{F_2} + Si{F_4}$$
C.
$$XeO{F_4} + Si{F_4}$$
D.
$$Xe{O_3} + Si{F_2}$$
Answer :
$$XeO{F_4} + Si{F_4}$$
140. The number of $$P\, - \,O\, - P$$ bonds in cyclic metaphosphoric acid is
A.
zero
B.
two
C.
three
D.
four
Answer :
three
