In the periodic table of the elements, the phrase “middle row anomaly” refers to
a) Middle elements of periodic table are transition metals.
b) Middle element of each group is unstable.
c) the relative instability of bromine oxides compared to the other halogen oxides.
d) The higher oxides of halogens tend to be more stable than the lower ones.
a) Middle elements of periodic table are transition metals.
b) Middle element of each group is unstable.
c) the relative instability of bromine oxides compared to the other halogen oxides.
d) The higher oxides of halogens tend to be more stable than the lower ones.
c) the relative instability of bromine oxides compared to the other halogen oxides.
Which of the following statement is false?
a) Radon is obtained from the decay of radium
b) Helium is an inert gas
c) Xenon is the most reactive among the rare gases
d) The most abundant rare gas found in the atmosphere is helium
The idea that promoted to Bartlett to prepare first ever compound of Noble gases was
a) Low bond dissociation enthalpy of F-F bond in \(F_2\).
b) High bond enthalpy of Xe-F bond.
c) Ionization enthalpies of \(O_2\) and Xe are almost same.
d) None of the above.
Stability of hydrides of group 16 elements
a) increases down the group
b) decreases down the group
c) all hydrides are equally stable
d) none of the above
Which statement correct about halogens?
a) They are all diatomic and form univalent ions.
b) They are all capable of exhibiting several oxidation states.
c) They are all diatomic and form diatomic ions.
d) They are all reducing agents.
Why is Helium used in divers' tank but not hydrogen gas?
a) Helium is lighter than hydrogen.
b) Helium is inert to any chemical reactions.
c) Helium is cheaper.
d) Helium is easy to get from market.
which is not the property of dioxygen gas
a) Dioxygen is a colourless and odourless gas.
b) Dioxygen is paramagnetic.
c) Dioxygen is diamagnetic.
d) Dioxygen is soluble in water which support aquatic life.
Which one is not correct statement?
a) Nitrogen does not form pentahalide due to non-availability of the d orbitals in its valence shell
b) Pentahalides are more covalent than trihalides.
c) In case of nitrogen, only \(NF_3\) is known to be stable
d) Trihalides except \(BiF_3\) are predominantly ionic in nature
Which of the following alcohols reacts most readily with Lucas reagent?
Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) carboxylic acid
The decreasing order of boiling point of the following alcohols is
(a) 3-methylbuan-2-ol > 2-methylbutan-2-ol > pentan-1-ol.
(b) Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol.
(c) 2-methylbutan-2-ol > 3-methylbutan-2-ol > pentan-1-ol.
(d) 2-methylbutan-2-ol > pental-1-ol > 3-methylbutan-2-ol.
Chlorine water on standing loses its yellow colour due to the formation of
a) Cl and HOCl.
b) HCl and HOCl.
c) HOCl and \(HOCl_2\).
d) HCl and \(HOCl_2\).
The lattice site in a pure crystal cannot be occupied by __________.
(A) Molecule
(B) Ion
(C) Electron
(D) Atom
The reaction \({\\(CH_3\\)}_2\)CHCl + NaI → \({(\\CH_3\\)}_2\)CHI + NaCl is known as –
a) Finkelstein’s reaction.
b) Stephen’s reaction.
c) Kolbe’s reaction.
d) Wurtz reaction.
The anomeric carbon in D(+) glucose is –
(a) C-1 carbon
(b) C-2 carbon
(c) C-5 carbon
(d) C-6 carbon