List of top Chemistry Questions

$\ce{H_2C = CH_2 + O_2 ->[Aqueous \; medium] Ch_3CHO}$ What is the catalyst used in the above green reaction?

Which of the following are carbonate ores? l) Magnetite II) Kaolinite III) Siderite IV) Calamine

Which one of the following has maximum number of hybrid orbitals ?

Observe the following molecules. $PCl_5, BrF_5, ClF_5, PF_5, ClF_3, XeF_4, XeF_2, IF_5 $ The number of molecules having square pyramidal geometry from the above is

Which of the following is water-gas shift reaction?

White phosphorus is heated with concentrated $NaOH$ in $CO _{2}$ atmosphere to form a gas $A$ and compound $B$. When $A$ is bubbled into aqueous $CuSO _{4}$ solution copper phosphide and $C$ are formed, $B$ and $C$ are respectively

Which one of the following is not present in the nitration mixture?

Noble metals like gold and platinum are soluble in which of the following mixtures?

$KO _{2}$, reacts with water to form $A, B$ and $C .$ $B$ forms $C$ when it reacts with iodine in basic medium. What are $B$ and $C$ respectively?

Which of the following orders are correct against the property given? I) dipole moment : $NF_3 > NH_3 >BF_3$ II) Covalent bond length : $C - O > N - O > O - H$ III) Bond order : $C_2 > B_2 > He_2$

The reaction in which $\Delta H > \Delta U$ is

The mass of AgCl precipitated when a solution containing 11.70 g of NaCl is added to a solution containing 3.4 g of AgNO3 is [Atomic mass of Ag = 108, Atomic mass of Na = 23]

The number of structural isomers for $ {C_6H_{14}}$ is

A non-volatile solute, ?A? tetramerises in water to the extent of 80%. 2.5 g of ?A? in 100 g of water, lowers the freezing point by 0.3 ?C. the molar mass of ? in mol L-1 is (Kf for water = 1.86 K kg mol-1)

Cis-1, 4-polyisoprene is called

Among the following, the main reactions occurring in blast furnace during extraction of iron from haematite are 1. $Fe_{2}O_{3} + 3CO \to 2Fe + 3CO_{2}$ 2. $FeO + SiO_{2} \to FeSiO_{3}$ 3. $Fe_{2}O_{3} + 3C \to 2Fe + 3CO$ 4. $CaO + SiO_{2} \to CaSiO_{3}$

An aqueous solution of CuSO4 is subjected to electrolysis using inert electrodes. The pH of the solution will

The number of moles of electron required to reduce 0.2 mole of Cr2O-27 to Cr+3

The conformations of n-butane, commonly known as eclipsed, gauche and anti-conformations can be interconverted by

Identify the equation in which change in enthalpy is equal to change in internal energy

In the reaction, $ H_{2}O_{2} (aq) \ce{->[I^{-}(aq)]} H_{2}O(I)+\frac{1}{2} O_{2}(g)$ iodide ion acts as

Veronal is used as a/an

How many total constituent particles are present in simple cubic unit cell ?

According to Werner?s theory the geometry of the complex is determined by

Limestone is used as a flux in the extraction of