561. Which of the following is not correct ?
A
$$Ge{\left( {OH} \right)_2}$$ is amphoteric
B
$$GeC{l_2}$$ is more stable than $$GeC{l_4}$$
C
$$Ge{O_2}$$ is weakly acidic
D
$$GeC{l_4}$$ in $$HCl$$ forms $${\left[ {GeC{l_2}} \right]^{2 - }}ion$$
Answer :
$$GeC{l_2}$$ is more stable than $$GeC{l_4}$$
562. The least number of oxyacids are formed by :
A
Chlorine
B
Nitrogen
C
Fluorine
D
Sulphur
Answer :
Fluorine
563. Which of the following is used to prepare $$C{l_2}$$ gas at room temperature from concentrated $$HCl?$$
A
$$NaOH$$
B
$${H_2}S$$
C
$$KMn{O_4}$$
D
$$C{r_2}{O_3}$$
Answer :
$$KMn{O_4}$$
564. $$\left( {S{i_2}{O_5}} \right)_n^{2n - }$$ anion is obtained when :
A
no oxygen of a $$SiO_4^{4 - }$$ tetrahedron is shared with another $$SiO_4^{4 - }$$ tetrahedron
B
one oxygen of a $$SiO_4^{4 - }$$ tetrahedron is shared with another $$SiO_4^{4 - }$$ tetrahedron
C
two oxygen of a $$SiO_4^{4 - }$$ tetrahedron are shared with another $$SiO_4^{4 - }$$ tetrahedron
D
three oxygen of a $$SiO_4^{4 - }$$ tetrahedron are shared with another $$SiO_4^{4 - }$$ tetrahedron
Answer :
three oxygen of a $$SiO_4^{4 - }$$ tetrahedron are shared with another $$SiO_4^{4 - }$$ tetrahedron
565. Ammonia can be dried by
A
$$\,{\text{Conc}}{\text{.}}\,{H_2}S{O_4}$$
B
$${P_2}{O_5}$$
C
$${\text{Anhydrous}}\,\,CuS{O_4}\,\,$$
D
none
Answer :
none
566. Oxygen will directly react with each of the following elements except?
A
$$P$$
B
$$Cl$$
C
$$Na$$
D
$$S$$
Answer :
$$Cl$$
567. The reason behind the lower atomic radius of $$Ga$$ as compared to $$Al$$ is
A
poor screening effect of $$d$$ - electrons for the outer electrons from increased nuclear charge
B
increased force of attraction of increased nuclear charge on electrons
C
increased ionisation enthalpy of $$Ga$$ as compared to $$Al$$
D
anomalous behaviour of $$Ga.$$
Answer :
poor screening effect of $$d$$ - electrons for the outer electrons from increased nuclear charge
568. A translucent white waxy solid $$(A)$$ reacts with excess of chlorine to give a yellowish white powder $$(B).$$ $$(B)$$ reacts with organic compounds containing $$-OH$$ group and converts them into chloro derivatives. $$(B)$$ on hydrolysis gives $$(C)$$ and is finally converted to phosphoric acid. $$(A), (B)$$ and $$(C)$$ are
A
$${P_4},PC{l_3},{H_3}P{O_4}$$
B
$${P_4},PC{l_5},{H_3}P{O_3}$$
C
$${P_4},PC{l_5},POC{l_3}$$
D
$${P_4},PC{l_3},POC{l_3}$$
Answer :
$${P_4},PC{l_5},POC{l_3}$$
569. There is a large number of carbon compounds due to
A
tetravalency of carbon
B
strong catenation property of carbon
C
allotropic property of carbon
D
non-metallic character of carbon
Answer :
strong catenation property of carbon
570. Sulphur trioxide can be obtained by which of the following reaction?
A
\[CaS{{O}_{4}}+C\xrightarrow{\Delta }\]
B
\[F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\xrightarrow{\Delta }\]
C
\[S+{{H}_{2}}S{{O}_{4}}\xrightarrow{\Delta }\]
D
\[{{H}_{2}}S{{O}_{4}}+PC{{l}_{5}}\xrightarrow{\Delta }\]
Answer :
\[F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\xrightarrow{\Delta }\]