List of top Chemistry Questions

Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?
 

(A)(B)(C)(D)
NH2-CH2-COOHC6H5-NH2C6H5-N=N-C6H5O2N-C6H4-NO2

Which one among the following compounds will most readily be dehydrated under acidic condition?
 

(A)(B)(C)(D)
CH3-CH2-CH2-OHCH3-CH(CH3)-CH2-OHCH3-CH2-CH(CH3)-OHC(CH3)(CH3)-CH2-OH
(1° alcohol)(2° alcohol)(2° alcohol)(3° alcohol)

For a chemical reaction, half-life period \(t_{1/2}\) is 10 minutes. How much reactant will be left after 20 minutes if one starts with 100 moles of reactant and the order of the reaction is:

P and Q combine to form two compounds PQ2 and PQ3. If 1 g of PQ2 is dissolved in 51 g of benzene, the depression of freezing point becomes 0.8°C. On the other hand, if 1 g of PQ3 is dissolved in 51 g of benzene, the depression of freezing point becomes 0.625°C. The atomic mass of P and Q are (Kf of benzene = 5.1 K·kg/mol):
An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure of 3.0 atm. In the course of usage at 27°C, the mass of the full cylinder is reduced to 24.2 kg. The volume of the used gas in cubic metre at the normal usage condition (1 atm and 27°C) is (assume LPG to be normal butane and it behaves ideally):
If three elements A, B, C crystallize in a cubic solid lattice with B atoms at the cubic centres, C atoms at the centre of edges, and A atoms at the corners, then the formula of the compound is:
The bond order of HeH+ is:
Increasing order of solubility of AgCl in:
  • (i) H2O
  • (ii) 1M NaCl (aq)
  • (iii) 1M CaCl2 (aq)
  • (iv) 1M NaNO3 (aq)
In a Bowler's solution containing the same concentrations of B- and HB, the ratio of KB to B- is 10-10. The pH of the Bowler's solution will be:
The bond dissociation energies of gaseous H2, Cl2, and HCl are 104, 58, and 103 kcal, respectively. The enthalpy of formation of HCl gas would be:
The best indicator for titrating 0.1 N Na2CO3 against 0.1 N HCl is:
Benzene on ozonolysis followed by reaction with Zn + H2O gives:
What is the enthalpy of neutralization for CH3COOH + NaOH?
What does sodium phthalate give on reaction with sodalime?
What is used for the Thermite Reaction?
What color does Silver Chloride (AgCl) turn upon exposure to sunlight?
What is the volume of solution needed to prepare a 3 Molarity (M) solution containing 80 g of NaOH?
Which of the following is not a Bronsted acid?
Calculate the number of unpaired electrons in [Mn(H2O)6]²⁺, considering H2O as a weak field ligand. (Atomic number of Mn = 25)
Which of the following oxides will be the most basic: Ti (22), V (23), Cr (24), Fe (26)?
What is the color of the flame produced when Magnesium (Mg) is burned in air?
Which process causes the oil to lose its taste?
What will be formed from the reaction: NaOH + Zn $\rightarrow$ ?
Which of the following is fully fluorinated polymer?
The main constituents of stainless steel are: