Which one of the following is the correct statement?
Among the following mixtures, dipole-dipole as the major interaction, is present in:
The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the:
When a tubelight breaks, a cracking sound is produced because ____________?
The method that cannot be used for removing permanent hardness of water is:
Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was:
Biogas mainly consists of:
What is the degeneracy of the rotational energy level with J = 4 for a heteronuclear diatomic molecule?
A hypothetical system consists of 5 molecules and 2 quanta. What is the number of possible arrangements?
H2O is liquid and H2S is a gas because:
Which of the following statements about diamond are correct?
(1) It is used as a gem in jewellery because of its ability to reflect light.
(2) It is good conductor of electricity.
(3) It is used for cutting glass, marble stones and other hard materials.
(4) It is used for drilling of rocks.
Select the correct answer using the codes given below :
In cold weather, aquatic animals survive even when water to the top layer of the lake freezes into ice because:
The most important ore of aluminium is:
In the process of electroplating a utensil with zinc:
The mineral containing both magnesium and calcium is:
The synthesis of alkyl fluorides is best accomplished by :
The inherited traits of an organism are controlled by:
What happened when a hard boiled egg after shelling is immersed in saturated brine?
A radioactive sample at any instant has its disintegration rate of 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. The decay constant per minute is:
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 ?
A reaction involving two different reactants can never be:
Air contains maximum amount of :
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.
Consider the following statements :
(1) Diamond is hard and graphite is soft.
(2) Diamond is soft and graphite is hard.
(3) Diamond is a bad conductor but graphite is a good conductor. (4) Diamond is a good conductor but graphite is a bad conductor.
Which of the statements given above is/are correct ?
Which one of the following gas is readily soluble in water at room temperature ?
Organic chemistry is the study of the compounds that make up living organisms. All organic molecules contain:
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 of the following is / are correct statements about Inert Gases?
(1) They have Zero Valency
(2) They don’t undergo chemical reactions
Select the correct option from the codes given below:
Hydrogen bomb is based on the principle of:
A sample of chloroform before using as an anaesthetic, is tested by