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:
The lowest energy level fills with ____________ first.
The monomer of polythene is:
The standard Gibbs energy change at 300 K for the reaction 2A B + C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the :[R = 8.314 J/K/mol, e = 2.718]:
Consider the spectral line resulting from the transition n = 2n = 1 in the atoms and ions given below. The shortest wave length is produced by:
The octane number of zero is assigned to:
Mass number of a nucleus is :
Phenyl magnesium bromide reacts with methanol to give:
For a galvanic cell, which of the following statements is never true?
Organic chemistry is the study of the compounds that make up living organisms. All organic molecules contain:
In which among the following categories, Radon (Rn) can be placed?
(1) Radioactive Element
(2) Inert Gas
(3) Noble Gas
Choose the correct option:
Unreactive non metals are called. ____________ .
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is:
Which have maximum number of isotopes ?
The number and type of bonds between two carbon atoms in calcium carbide are:
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
Which among the following is called Laughing Gas popularly?
Horizontal rows in the periodic table are called ___________.
What is used to avoid melting of ice ?
Which gas is filled in refrigerators ?
Which is used in preparation of dynamite ?
Which among the following element is an essential constituent of acids?
The nuclear particles which are assumed to hold the nucleons together are:
The most important ore of aluminium is:
The partial pressure of a component in a gas-phase reaction is 0.452 atm. What is the activity of the component?
α-D-(+)-glucose and β-D-(+)-glucose are
The method that cannot be used for removing permanent hardness of water is:
The most electronegative element among the following is :
Consider the following statements and select the correct code.
Assertion (A): The main constituent of the
liquefied petroleum gas is methane.
Reason (R): Methane can be used directly for burning in homes and factories where it can be supplied through pipelines.