Study of diborane - class-XI
Description: study of diborane | |
Number of Questions: 93 | |
Created by: Akash Patil | |
Tags: chemistry p- block elements-i elements of group 13, 14 and 15 the p-block elements the p-block elements - group 13 some p-block elements |
Boron can undergo the following reactions with the given enthaly changes:
Assume no other reactions are occurring. If in a container (operating at constant pressure) which is isolated from the surrounding, mixture of are passed over excess of B(s), then calculate the molar ratio so that temperature of the container do not change :
${\text{2B}}\left( {\text{s}} \right){\text{ + }}\dfrac{{\text{3}}}{{\text{2}}}{{\text{O}} _{\text{2}}}\left( {\text{g}} \right) \to {{\text{B}} _{\text{2}}}{{\text{O}} _{\text{3}}}\left( {\text{s}} \right);\;\Delta H = - 1260\;KJ$
${\text{2B}}\left( {\text{s}} \right){\text{ + 3}}{{\text{H}} _{\text{2}}}\left( {\text{g}} \right) \to {{\text{B}} _2}{H _6}\left( g \right);\;\Delta H = 30KJ$
Moissan boron is:
For healthy growth of plants, boron is an essential:
Which of the following is used as control rods in nuclear reactors?
Diborane undergoes cleavage and gives aduct with
(i) CO
(ii) $ H _2O $
(iii) $ N(Me) _3 $
(iv) $ NH _3 $
Borazole is an isoster of
Diborane does not react with?
The number of simple covalent bonds (B-H) present in diborane:
Which of the following statement is correct for diborane ?
Which one of the following statement is not true regarding $B _2H _6$ ?
Boron halides behave as Lewis acids because of their ________ nature.
Diborane combines with ammonia at ${120}^{o}C$ to give:
Number of terminal hydrogen atoms present in diborane?
Borazine is sometimes called inorganic benzene. Which of the following reactions is expected to give this compound?
$BCl _3+LiAlH _4\rightarrow A+LiCl+AlCl _3$
$A+H _2O\rightarrow B+H _2$
$B\rightarrow C$.
in this reaction sequence A, B, and C compounds respectively are?
$B _2H _6 + NH _3 \rightarrow$ Addition compound $(X)$
$(X) \overset{450K}{\rightarrow} Y + Z(g)$
In the above sequence $Y$ and $Z$ are respectively:
Diborane belongs to the :
The product obtained when one mole of diborane reacts with two mole of $NH _3 $ at high temperature ?
On hydrolysis, diborane produces:
Diborane is:
Identify the statement that is not correct as far as structure of diborane is concerned.
In diborane:
When an inorganic compound (X) having 3c-2e as well as 2c-2e bonds reacts with ammonia gas at a certain temperature and gives a compound(Y) iso-structural with benzene.Compound (X) with ammonia at a high temperature, produces a hard substance (Z).Then:
An example of three centred bond is:
In the reaction, $2X+B _{2}H _{6}\rightarrow [BH _{2}(X) _{2}]^{+}BH _{4}^{-}$, the amine(s) X is (are) :
Select the incorrect statement
Diborane $(B _2H _6)$ on combustion give
Diborane is formed from the elements as shown in equation (1) $ 2B(s) +3H _2(g) \rightarrow B _2H _6(g) ......(1) $
The $ H^o$ for the reaction (1) is
Given that
$ { H } _{ 2 }O(\ell )\rightarrow H _{ 2 }O(g) $ | $ \Delta { H } _{ 1 }^{ 0 }=44kJ $ |
---|---|
$ 2B(s)+\frac { 3 }{ 2 } { O } _{ 2 }(g)\rightarrow B _{ 2 }O _{ 3 }(s) $ | $ \Delta { H } _{ 2 }^{ 0 }=-1273kJ $ |
$ B _{ 2 }H _{ 6 }(g)+3O _{ 2 }(g)\rightarrow B _{ 2 }O _{ 3 }+3H _{ 2 }O(g) $ | $ \Delta { H } _{ 3 }^{ 0 }=-2035kJ $ |
$ H _{ 2 }(g)+\frac { 1 }{ 2 } O _{ 2 }(g)\rightarrow H _{ 2 }O(\ell ) $ | $ \Delta { H } _{ 4 }^{ 0 }=-286kJ $ |
$B _2H _6$ reacts with $O _2$ and $H _2O$ respectively to form:
Which is/are correct for $B _2H _6$ structure ?
Which of the following statement about boron carbide is wrong?
Find the incorrect match.
Find out the similarities between $I _2Cl _6$ and $Al _2Cl _6$.
Which of the following molecule has $3C\, -\, 4e^-$ bond?
Which one of the following methyl diboranes does not exist?
Identify the statement(s) that is/are correct as far as structure of diborane is concerned :
Which of the following overlapping is used for the formation of $3C\, -\, 2e^-$ bond in chain polymer of $BeMe _2$ ?
Which type of bond is present in $[BeF _2] _n$ polymer?
Which is/are correct representation of boranes?
Select the correct statements(s).
A boron carbide rod is used in a nuclear reactor, because boron $( ^{10}B )$ has a very:
Assertion : Diborane has two types of hydrogens.
Reason : By methylation only four hydrogen atoms of diborane are substituted forming $Me _{4}B _{2}H _{2}$.
Which one of the following compounds does not belong to the family of boranes?
The total number of electrons shared between two boron atoms in $B _{2}H _{6}$ is :
The mixture of $BCl _{3}$ vapour and hydrogen gas is subjected to electric discharge, The products obtained are:
In diborane molecule hydrogen bridge bond is formed because boron has:
Assertion (A) : When diborane is heated with $NH _{3}200^{0} C ,$ borazole is obtained :
Reason (R): Borazole is known as inorganic benzene :
Identify the statement that is not correct as far as the structure of diborane is concerned:
In diborane, the Tau-bonds can be formed by the overlapping of orbitals :
$B _{2}H _{6}$ undergoes substitution reaction with:
With which of the following diborane does not produce hydrogen?
The non planar molecule among the following is:
In the case of small cuts, bleeding is stopped by applying potash alum, hence alum acts as:
Which one of the following does not exist in the free form ?
From $B _2H _6$, all the following can be prepared except :
The hydrides of boron are called :
The reaction between diborane and chlorine yields :
Which of the following statement is/are correct regarding $B _{2}H _{6}$?
In which of the following molecules is hydrogen bond absent?
Which of the following molecular hydride acts as a lewis acid?
The most acidic compound among the following is:
When $NaBH _4$ reacts with $HI$,the product formed is:
All the products formed in the oxidation of $NaBH _{4}$ by $I _{2}$, are:
Which one of the following molecular hydrides acts as a Lewis acid?
In diborane, boron involves:
Why do boron and aluminium halides behave as Lewis acids?
Which of the following is not true regarding the nature of halides of boron?
Compound $(X)$ on reduction with $LiAlH _4$ gives a hydride $(Y)$ containing 21.72% hydrogen along with other products. The compound $(Y)$ react with air explosively resulting in boron trioxide. Compounds $X$ and $Y$ are respectively:
Hydrogen form a 'bridge' in the chemical structure of which of the following compound?
On hydrolysis diborane produces ?
In the reaction,
$2X+B _2H _6 \rightarrow [BH _2(X _2)]^+[BH _4]^-$
'X' cannot be ?
A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form $'A'$ and $HCl. 'A'$ is miced with $NH _3$ and heated to $200^oC$ to form $'B'$. The formula of $'B'$ is
Select the correct statement(s):
Which of the following statements(s) is/are correct?
Select the correct statement(s).
Which of the following statements(s) is/are correct?
$Mg _3B _2\xrightarrow {HCl _{(aq)}}[X]+MgCl _2$
In the reaction $2X+B _2H _6\rightarrow [BH _2X _2]^+[BH _4]^-$ the amine(s) X is (are) :
$BCl _{3}$ does not exist as a dimer but $BH _{3}$ exists as a dimer because:
The reaction which gives Borazole as a major product is ?
When an inorganic compound (X) having $3c-2e$ as well as $2c-2e$ bonds reacts with ammonia gas at a certain temperature, gives a compound (Y) iso-structural with benzene. Compound (X) with ammonia at a high temperature, produces a hard substance (Z). Then :
The type of hybridisation of boron in diborane is :
$BCl _3$ does not exist as dimer but $BH _3$ exists as dimer $(B_2H_6) because.
Which among the following is not a borane?
A compound $A$ of boron reacts with $NMe _3$ to give an adduct $B$ which on hydrolysis gives a compound $C$ and a gas $D$. Compound $C$ is an acid.
A compound $A$ of boron reacts with $NMe _3$ to give an adduct $B$ which on hydrolysis gives a compound $C$ and a gas $D$. Compound $C$ is an acid.
Which of the following are used as catalyst in Friedal-craft reaction?
An alkali metal hydride (NaH) react with diborane in 'A' to give a tetrahedral compound 'B' which is extensively used as reducing agent in organic synthesis. The compounds 'A' and 'B' respectively are :
A compound $X$, of boron reacts with $NH _3$ on heating to give another compound $Y$ which is called inorganic benzene. The compound $X$ can be prepared by treating $BF _3$ with lithium aluminum hydride. The compounds $X$ and $Y$ are represented by formula:
The styx number for $B _2H _6$ is:
Diborane undergoes cleavage and gives aduct with