List of top Chemistry Questions

\(BeO\) reacts with \(HF\) in presence of ammonia to give \([A]\) which on thermal decomposition produces \([B]\) and ammonium fluoride. Oxidation state of Be in \([A]\) is _______
The spin-only magnetic moment value of the most basic oxide of vanadium among \(V_2O_3, V_2O_4\) and \(V_2O_5\) is ______B.M. (Nearest integer)
The ′f′ orbitals are half and completely filled, respectively in lanthanide ions
[Given: Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]
The spin-only magnetic moment value of an octahedral complex among \(CoCl_3⋅4NH_3\), \(NiCl_2⋅6H_2O\) and \(PtCl_4⋅2HCl\), which upon reaction with excess of \(AgNO_3\) gives 2 moles of \(AgCl\) is _____ B.M. (Nearest Integer)
Compound ‘P’ on nitration with dil. HNO3 yields two isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO3 yields a yellow compound ‘C’, a strong acid. The number of oxygen atoms is present in compound ‘C’ _____
The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ________.
A chemical which stimulates the secretion of pepsin is
Which of the following sets are correct regarding polymer?
  1. Copolymer : Buna-S
  2. Condensation polymer : Nylon-6,6
  3. Fibres : Nylon-6,6
  4. Thermosetting polymer : Terylene
  5. Homopolymer : Buna-N
Choose the correct answer from given options below
Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol –1. (Nearest Integer) [Given: R = 0.082 L atm K–1 mol–1]

On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is ______. (Nearest Integer)

When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the magnitude of the maximum work obtained is _____ J. [nearest integer] (Given : R = 8.3 J K–1 mol–1 and log 2 = 0.3010)
A solution containing 2.5 × 10–3 kg of a solute dissolved in 75 × 10–3 kg of water boils at 373.535 K. The molar mass of the solute is _____ g mol–1. [nearest integer] (Given : Kb(H2O) = 0.52 K kg mol–1 and boiling point of water = 373.15 K)

pH value of 0.001 M NaOH solution is _______.

For the reaction taking place in the cell: 
Pt(s) | H2(g) | H+ (q) || Ag+(aq) | Ag(s), 
Eocell = + 0.5332 V. 
The value of ΔfGo is _____kJ mol–1 [in nearest integer]

It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be _________kJ mol–1. [nearest integer] (Given ln10 = 2.3, R = 8.3 J K–1 mol–1, log 2 = 0.30)
Fig. 













If the initial pressure of a gas 0.03 atm, the mass of the gas absorbed per gram of the adsorbent is ____× 10–2g

In the structure of SF4, the lone pair of electrons on S is in.

A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of 
\(\frac{[CH_3CH_2COO^−]}{[CH_3CH_2COOH] }\)
required to make buffer is _____.
Given : Ka(CH3CH2COOH) = 1.3 × 10–5

17.0 g of NH3 completely vapourises at – 33.42°C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol–1 . The enthalpy change for the vapourisation of 85 g of NH3 under the same conditions is ____ kJ.

In the metallurgical extraction of copper, following reaction is used :
FeO + SiO2 → FeSiO3 
FeO and FeSiO3 respectively are.

1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198°C. The percentage of dissociation of the acid is ____ . (Nearest integer) 
[Given: Density of acetic acid is 1.02 g mL–1.. 
Molar mass of acetic acid is 60 g mol–1 
Kf(H2O) = 1.85 K kg mol–1].
Hydrogen has three isotopes: protium (1H), deuterium (2H or D) and tritium (3H or T). They have nearly same chemical properties but different physical properties. They differ in
Among the following, basic oxide is:

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ____ cm3. (Nearest integer) 

[Given : Faraday constant F = 96500 C mol–1 at STP, molar volume of an ideal gas is 22.7 L mol–1]

Among the given oxides of nitrogen; N2O, N2O3, N2O4 and N2O5, the number of compound/(s) having N – N bond is: