Air contains maximum amount of
Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 40 Degree C gives predominantly:
Higher order (>3) reactions are rare due to :
Which of the following substances is/are ozone depleting? Select the correct answer from the codes given below:
(1) Chlorofluorocarbons
(2) Halons
(3) Carbon tetrachloride
Which among the following are constituents of Brass?
What is the degeneracy of the rotational energy level with J = 4 for a heteronuclear diatomic molecule?
The mass number of an atom is equal to:
Which mineral is radium obtained?
α-D-(+)-glucose and β-D-(+)-glucose are
The synthesis of alkyl fluorides is best accomplished by :
Which of the following cannot be emitted by radioactive substances during their decay ?
The inexhaustible source of energy of the stars is due to:
Consider the following statements regarding diamond:
(1) It is an allotrope of silicon.
(2) It is a bad conductor of heat and electricity.
(3) It is the hardest substance.
(4) It burns to produce carbon dioxide.
Which of the statements given above are correct?
The electron emitted in beta radiation originate from
If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
Elements that show the properties of both metals and non metals are called ?
What is used to avoid melting of ice ?
Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as:
Hydrofluoric acid is not kept in glass bottles because it reacts with:
After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000 dps after another 140 days. The initial activity of the sample in dps is:
The structure of diborane (B2H6) contains
Which of the following is also known as wood alcohol?
What are the elements which are liquids at room temperature and standard pressure?
(1) Helium (2) Mercury
(3) Chlorine (4) Bromine
Select the correct answer using the codes given below:
The pH of water at 25°C is 7. When it is heated to 100°C, the pH of water:
Which of the following can be used for removal of stains of rust on clothes?
(1) H2O2 (2) Oxalic acid
(3) Petrol (4) Alcohol
White Phosphorous is represented by which among the following symbols?
The electron in a hydrogen atom makes a transition from an excited state of state the ground Which of the following statements is true ?
Which have maximum number of isotopes ?
The major constituent of air is: