Chemistry - Chemistry of Non Metals II Question Paper 1
Exam Duration: 45 Mins Total Questions : 23
During Labortory preparation of Cl2,MnO2
- (a)
is reduced
- (b)
is oxidised
- (c)
acts as a catalyst
- (d)
acts in none of the above
Mn in MnO2. with oxidation number +2 is reduced to in MnCl2
Silica is acted upon by acid:
- (a)
HCl
- (b)
HI
- (c)
HBr
- (d)
HF
SiO2+4HF ⟶ SiF4+2H2O.It does not dissolve in other acids.
Carborudam is the commercial name of
- (a)
Al2O3
- (b)
Ca(H2PO4)2
- (c)
H3PO4
- (d)
SiC
On continuously passing carbondioxide through lime water, we get first white precipiate, which later disappesrs because
- (a)
first lime is precipitated which dissolves again
- (b)
first some impurities are precipitated which with carbondioxide to form transparent material
- (c)
first calcium carbonate is are precipitated which later turns into soluable calcium bicarbonate
- (d)
precipitation is only an illusion
CO2+Ca(OH)2 ⟶ CaCO3+H2O
CaCO3+H2O+CO2⟶Ca(HCO3)2 soluble
Which one of the following can be used to identify silicon conveniently?
- (a)
Borax bead test
- (b)
Action of HCl
- (c)
Reaction with fluoride
- (d)
Fusion with carbon
Which one of the following states best describes glass?
- (a)
Liquid
- (b)
Solid
- (c)
Collodial
- (d)
Supercooled Liquid
Glass is supercooled liquid.
Water gas is mainly a mixture of
- (a)
CO+CO2
- (b)
CO+N2
- (c)
CO+H2
- (d)
CO+O2
This contains 49% H2 and 44% CO.
The diamond and graphite are
- (a)
isomorphous
- (b)
isomers
- (c)
allotropes
- (d)
isotopes
Allotrophyis the property of elements because of which an element is found in diftérent forms, e.g., diamond and graphite
The number of moles of water needed to convert one mole of P2O5 into orthophosphoric acid is
- (a)
2
- (b)
3
- (c)
4
- (d)
5
Which one of the following has highest covalent radius?
- (a)
Oxygen
- (b)
Sulpher
- (c)
Selenium
- (d)
Tellurium
This is because as we go down in a group the size of the atom increases.
Sodium meta-sulphite is obtained by heating
- (a)
Na2SO3
- (b)
Na2HSO3
- (c)
Na2HSO4
- (d)
Na2SO4
2NaHSO3 \(\overset { Heat }{ \longrightarrow } \) Na2S2O5 +H2O
The shape of SO42- ion is
- (a)
linear
- (b)
square planer
- (c)
pyramidal
- (d)
tetrahedral
\({ SO }_{ 4 }^{ 2- }\) ion is tetrahedral
In the manufacture of bromine from sea-water, the hot mother liquor containing bromides is treated with
- (a)
Chlorine
- (b)
Fluorine
- (c)
Iodine
- (d)
carbondioxide
Chlorine replaces bromine
2Br- + Cl2 ⟶ 2Cl-
Fluorine could not be isolated easily because it
- (a)
is a very rare
- (b)
is a very light
- (c)
reacts with chlorine
- (d)
is highly reactive
Because of high reactivity of fluorine its isolation has been a big problem. It was solved by using such metals always which may not be affected by fluorine
Which one of the following halogens finds use in separating uranium isotopes 235U from 238U ?
- (a)
Fluorine
- (b)
Chlorine
- (c)
Bromine
- (d)
Iodine
Which one of the f ollowing halide ions is easiest to oxidise?
- (a)
F-
- (b)
Cl-
- (c)
Br-
- (d)
I-
Helium is preferred to hydrogen in filling ballons because it is
- (a)
lighter than hydrogen
- (b)
more reactive than hydrogen
- (c)
abundantly found in air
- (d)
chemically inert
Radon is
- (a)
a drug
- (b)
an artificial fibre
- (c)
an explosive
- (d)
a noble gas
Which one is the strongest aacid among the following?
- (a)
HCl
- (b)
HBr
- (c)
HI
- (d)
H2S
Which metaborate is blue?
- (a)
Ni(BO)2
- (b)
CO(BO)2
- (c)
Cr(BO2)2
- (d)
NaBO2
In the reaction \({ C }_{ 2 }{ H }_{ 5 }OH+HX\underrightarrow { { Zn }\quad X_{ 2 } } { C }_{ 2 }{ H }_{ 5 }X\), the order of the reactivity of HX is
- (a)
HBr>HI>HCI
- (b)
HI>HCI>HBr
- (c)
HI>HBr>HCI
- (d)
HCI>HBr>HI
The reaction is SN1 and as per rate determining step Rate \(\alpha\) [H+ ], so the order will be the acidic strength, hence order of HX is HI>HBr>HCI>HF.
Which of the following statements regarding SN1 reaction shown by alkyl halide is incorrect?
- (a)
The added Nu- plays no kinetic role in SN1 reaction
- (b)
SN1 reaction involves the inversion of configuration of optically active substance
- (c)
SN1 reaction on chiral starting material ends up with racemisation of the product
- (d)
Polar protic solvent increases the rate of SN1 reaction
SN1 reaction always produces racemic mixture of one inverted and other retented product. Inversion takes place only SN2 reaction.
The treatment of CH3MgX with \({ CH }_{ 3 }-C\equiv C-H\) produces
- (a)
\({ CH }_{ 3 }-CH={ CH }_{ 2 }\)
- (b)
\({ CH }_{ 3 }C\equiv C-{ CH }_{ 2 }\)
- (c)
\({ CH }_{ 3 }-\overset { \overset { H }{ | } }{ C } =\overset { \overset { H }{ | } }{ C } -{ CH }_{ 2 }\)
- (d)
CH4
Terminal alkyne has hydrogen which is enough to protonate the Grignard reagent.
\({ CH }_{ 3 }MgX+{ CH }_{ 3 }C\equiv CH\longrightarrow { CH }_{ 4 }+{ CH }_{ 3 }C\equiv CMgX\)