The heat required to raise the temperature of body by 1 K is called:
The metal does not give H2 on treatment with dilute HCL is:
The nuclear particles which are assumed to hold the nucleons together are:
Consider the following statements :
In 90 2 38 Sr : (i) atomic number is 36
(ii) number of electrons is 38
(iii) number of neutrons is 52
(iv) number of protons is 38 Which of these are correct ?
In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be:
Unreactive non metals are called. ____________ .
Which among the following acids is abundant in Grapes, Bananas and Tamarind?
Which of the following is the most active chemically?
Among the following mixtures, dipole-dipole as the major interaction, is present in:
The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is:
Mass number of a nucleus is :
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):
Which acid is present in lemon ?
Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 40 Degree C gives predominantly:
Consider the following about non-metals
(1) Non-metals are malleable
(2) Non-metals are ductile
(3) Non-metals are brittle The correct answer is:
Which of the following compounds will exhibit geometrical isomerism?
The molecular formula of phosphorous 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.
Consider the following statements and select the correct code.
Assertion (A) : In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group
Reason (R) : In a group, the atomic radii generally increase from top to bottom.
Zone refining is used for the purification of:
Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl:
Which metal is heaviest ?
Air contains maximum amount of
A sample of chloroform before using as an anaesthetic, is tested by
During a negative beta decay:
The most important ore of aluminium is:
Which of these elements is a nonmetal?
Which types of isomerism is shown by 2,3-dichlorobutane?
Which is not a type of elements ?