List of top Chemistry Questions

Which of the following is an artificial edible colour ?
$1 \,g$ of $U -235$ is converted into $UF _{6}$. The radioactivity of $UF _{6}$ thus obtained is :
The product/s of the reaction, is/are: $Na _{2} CO _{3}+ CO _{2}+ H _{2} O \rightarrow$
Which of the following compounds will react with two moles of $CH_3MgBr$ ?
In which of the following molecules $S$ atom does not assume $sp ^{3}$ hybridsation?
For the reaction, $N _{2}( g )+3 H _{2}( g ) \rightleftharpoons 2 NH _{3}( g )$, the unit of $K$ is :
Ozone depletion over Antarctica is due to the
The well known urinary antiseptic urotropine is formed when formaldehyde reacts with
$K _{ b }$ for water is $0.52\, K / m$. Then $0.1 \,m$ solution of $NaCl$ will boil approximately at:
One mole of $P _{2} O _{5}$ undergoes hydrolysis as $P _{2} O _{5}+ H _{2} O \rightarrow H _{3} PO _{4}$ The normality of the phosphoric acid formed is (The volume of solution is $1\, L$ )
Which of the following does not contain any coordinate bond?
$1 \,L$ of a gas is at a pressure of $10^{-6} \, mm$ of Hg at $25^{\circ} C$. How many molecules are present in the vessel?
The $pH$ of a $0.01 \,M\, HCN$ solution for which $pK_a$ is $4$ is
Which anion is the weakest base?
Two glass bulbs $A$ and $B$ are connected by a very small tube having a stop-cock. Bulb $A$ has a volume of $100\, cm^3$ and contained the gas while bulb $B$ was empty. On opening stop-clock, the pressure fell down to $40\%$. The volume of the bulb $B$ must be
For the reaction, $C _{3} H _{8}( g )+5 O _{2}( g ) \longrightarrow 3 CO _{2}( g )+4 H _{2} O ( l )$ at constant temperature, $\Delta H-\Delta E$ is
300 cal of heat is supplied to raise the temperature of 50 g of air from $ 20{}^\circ C $ to $ 30{}^\circ C $ without any change in its volume. Change in internal energy per gram of air is
Final pressure is higher than initial pressure of a container filled with an ideal gas at constant temperature. What will be the value of equilibrium constant?
The weight of iron which will be converted into its oxide $\left( Fe _{3} O _{4}\right)$ by the action of $18\, g$ of steam on it will be (At. wt. of $Fe =56$ )
During the formation of a chemical bond
The correct IUPAC name of the compound
The $sp^3d^2$ hybridization of central atom of a molecule would lead to
Ethyl benzene cannot be prepared by
What happens when blood cells are placed in pure water?
: Equal moles of different substances contain same number of constituent particles. : Equal weights of different substances contain the same number of constituent particles.