"An alkyl halide with molecular formula \(C6H13Br\) on dehydrohalogenation gave two isomeric alkenes \(A\) and \(B\) with molecular formula \(C6H12\). On reductive ozonolysis, \(A\) and \(B\) gave four compounds \(CH3COCH3\), \(CH3CHO\), \(CH3CH2CHO\) and \((CH3)2CHCHO\). The alkyl halide is :"

The substance having the same value of van't Hoff factor as that of \(K_4[Fe(CN)_6]\) is :

According to the collision theory which one of the following statements is correct?

Which metal has the highest oxidation state in the first row transition series?

The units of rate constant of four reactions are given below. Arrange them in the increasing order of reaction.
(A)\(s^{-1}\)
(B) \(mol L ^{-1} s^{-1}\)
(C) \(\mathrm{mol}^{1 / 2} \mathrm{~L}^{-1 / 2} \mathrm{~s}^{-1}\)
(D) \(\mathrm{L}^{1 / 2} \mathrm{~mol}^{-1 / 2} \mathrm{~s}^{-1}\)
Choose the correct answer from the options given below:

Question based on the following passage :
P-Block elements are placed in group 13 to 18 in the periodic table. Group 15 is nitrogen family.
Nitrogen can react with hydrogen, oxygen, halogens etc. It shows multiple oxidation states in its various oxides i.e. \(N_2O, N_2O_3, N_2O_5\) etc. Important allotropic forms of phosphorus are white, red and black phosporus. Various compounds of phosphorus are phosphine, \(PCl_3, PCl_5\) and oxoacids of phosphorus. Oxidation states \(+1\) to \(+5\) are seen in various oxoacids of phosphorus. Group 17 elements are collectively known as halogens. Bond dissociation enthalpy of \(F_2\) is smaller than \(Cl_2\).
The gases present in group 18 are chemically unreactive, they form only few compounds. Neil Bartlett (in 1962) observed the reaction of a noble gas. Since then, many noble gas compounds have been synthesised.
The bond angle in \(PH_3\) is less than \(PH_4^+\) due to :

Which of the following statements with reference to a solution are correct?
(A) the molarity of the solution changes with the change in the temperature.
(B) the volume of the solution changes with the change in the temperature.
(C) the molality of the solution changes with the change in the temperature.
(D) the normality of the solution changes with the change in the temperature.
Choose the correct answer from the options given below:

Introduction of which of the following on Galopagos islands caused extinction of Abingdon tortoise ?

An ammeter and a Voltmeter are to be connected in a circuit. Which of the following statements are correct?
(A) Ammeter has negligible resistance.
(B) Ammeter is always connected in series in the circuit.
(C) Voltmeter should have negligible resistance.
(D) Voltmeter should be connected in parallel so that the whole current may pass through it.
Choose the correct answer from the options given below:

If \(2 P(A)=P(B)=\frac{5}{13}\) and \(P(A \mid B)=\frac{2}{5}\), then the value of \(P(A \cup B)\) is :

Arrange the following electrodes in decreasing order of the strength of the respective ions as reducing agent.
(A) \(Cu ^{2+}+2 e^{-} \rightarrow Cu ( s ) \quad E^{\circ}=0.34 V\)
(B) \(Sn ^{2+}+2 e^{-} \rightarrow Sn (s) \quad E^{\circ}=-0.14 V\)
(C) \(AgBr (s)+e^{-} \rightarrow Ag (s)+ Br ^{-} \quad E^{\circ}=0.10 V\)
(D) \(Pb ^{2+}+2 e^{-} \rightarrow Pb (s) \quad E^{\circ}=-0.13 V\)
Choose the correct answer from the options given below:

Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
Which one of the following drugs can not quickly reduce the symptoms of allergy?

The speed of light in a medium depends on: