List of top Chemistry Questions

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

$CH_3CH_2Br$ undergoes Wurtz reaction. We may expect some of the following product $A : CH_3CH_2CH_2CH_3$ $B : CH_2 = CH_2$ $C : CH_3 ? CH_3$ Select correct product.

The effective atomic number of cobalt in the complex $[Co(NH_3)_6]^{3+}$ is

In which of the following octahedral complexes of Co (At. no. 27), will the magnitude of $\Delta_{0}$ be the highest?

Sometimes explosion occurs while distilling ethers. It is due to the presence of

An alkene having molecular formula $C_8H_{12}$ on ozonolysis yields glyoxal and 2, 2-dimethyl butane-1, 4-dial. The structure of alkene is

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

In producing chlorine through electrolysis $100\, W$ power at $125\, V$ is being consumed. How much chlorine per minute is leberated? ($ECE$ of chlorine is $0.367 ? 10^{-6}\, kg/C$)

$"925$ fine silver" means an alloy of

In a set of reactions acetic acid yielded a product D. $CH_{3} COOH {->[{SOCl_{2}}]} A {->[{\text{Benzene}}][{\text{anhy} AlCl_{3}}]} B {->[{HCN}]} C {->[{H_{2}O}]}$ The structure of D would be

Glycerine is used as a preservative for fruits and eatables because

Which one of the following will be most basic?

In the reversible reaction, $2 NO _{2} \ce{->[{k_{1}}][{K_{2}}]} N _{2} O _{4}$ the rate of disappearance of $N O_{2}$ is equal to

: Equal moles of different substances contain same number of constituent particles. : Equal weights of different substances contain the same number of constituent particles.

$1 \,g$ of $U -235$ is converted into $UF _{6}$. The radioactivity of $UF _{6}$ thus obtained is :

Which of the following is an artificial edible colour ?

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 $1\, L$ )

$1 \,L$ 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?

Ozone depletion over Antarctica is due to the

Which of the following compounds will react with two moles of $CH_3MgBr$ ?

The product/s of the reaction, is/are: $Na _{2} CO _{3}+ CO _{2}+ H _{2} O \rightarrow$

The $pH$ of a $0.01 \,M\, HCN$ solution for which $pK_a$ is $4$ is

For the reaction, $N _{2}( g )+3 H _{2}( g ) \rightleftharpoons 2 NH _{3}( g )$, the unit of $K$ is :

Which anion is the weakest base?

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