Assertion (A) : Equal moles of different substances contain same number of constituent particles.Reason (R) : Equal weights of different substances contain the same number of constituent particles.The correct answer is
The correct match is
The correct order of reducing abilities of hydrides of V group elements is
Which of the following is an endothermic reaction ?
Average C-H bond energy is 416 kJ. mol-1. Which of the following is correct ?
Which of the following statements is NOT correct?
Hydrolysis of sucrose with dilute aqueous sulphuric acid yields
Which of the following statements is correct
A codon has a sequence of A and specifies a particular B that is to be incorporated into aC What areA, B, C
Assertion (A) : A catalyst increases the rate of a reaction.Reason (R) : In presence of a catalyst, the activation energy of the reaction increases. The correct answer is
Assertion (A) : A current of 96.5 A is passed into aqueous AgNO3 solution for 100 s. The weight of silver deposited is 10.8 g (At. wt. of Ag = 108)Reason (R) : The mass of a substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passing through the electrolyte.The correct answer is :
Assertion (A) : K, Rb and Cs form superoxides.Reason (R) ; The stability of the superoxides increase from 'K' to 'Cs' dueto decrease in lattice energy. The correct answer is
While phosphorus form PCl5, nitrogen does not form NCl5 because
Cuprous ion is colourless while cupric ion is coloured because :
Observe the following statements :I. The physical and chemical properties of elements are periodic functions of their electronic configuration.II. Electronegativity of fluorine is less than the electronegativity of chlorine.III. Electropositive nature decreases from top to bottom in a group.The correct answer is :