What is atomic number of an atom?
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is(at. mass Ag = 108; Br = 80):
Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:
The synthesis of alkyl fluorides is best accomplished by :
Air contains maximum amount of
In cold weather, aquatic animals survive even when water to the top layer of the lake freezes into ice because:
The metal does not give H2 on treatment with dilute HCL is:
What is the general formula of Alkanes?
The minimum in the potential-energy well for the interaction between methane molecules has been found to be 0.346 nm. Determine the value of the equivalent Lennard-Jones parameter, σ.
Which among the following is the most abundant organic compound in nature?
What is the degeneracy of the energy level with n = 6 in a hydrogenic atom or ion?
The hottest part of the gas flame is known as:
The monomer of polythene is:
If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for calculating the molecular mass is:
Which of the following gas is used in cigarette lighters ?
The most malleable metal is:
Calculate the contour length of a poly(methylmethacrylate) polymer chain of 500 monomer units if the monomer length is 2.23 Å.
Due to rusting the weight of iron:
The luster of a metal is due to:
The main chemical constituent of clay is:
An electron changes its position from n= 2 to the or bit n = 4 of an atom. The wave length of the emitted radiations is (R = Rydberg’s constant)
What do non metal atoms lose to form negatively charged ions?
Which one of the following pairs is correctly matched?
Who is credited with the invention of the modern periodic table?
Which one of the following types of drugs reduces fever?
Which of the following statements in relation to the hydrogen atom is correct?
Hydrogen bomb is based on the principle of:
The correct order of these fuels in terms of their
calorific value in increasing order is
(1) Hydrogen gas (2) Kerosine oil
(3) Charcoal (4) Wood
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The electron emitted in beta radiation originate from