Chemistry questions
29404 published questions with worked solutions.
- What happens when the temperature of a solution is increased from 25°C to 52°C?
- The rate constants at 27°C and 67°C for the dissociation of N_2O_5 are 3.45 10^ -5 and 6.90 10^ -3 respectively. What is the...
- As temperature increases, t_ 1/2 will _______
- In Arrhenius equation, k=Ae^ -E_a/RT ; ′A′ may be called the rate constant at _______
- If the activation energy for the forward reaction is 150 kJ ,mol^ -1 and that of the reverse reaction is 260 kJ ,mol^ -1 , what...
- The half-life of a first order reaction having rate constant k = 1.7 10^ -5 s^ -1 is _____
- Which of the following reaction characteristics change on addition of a catalyst to a reaction at constant temperature? (i)...
- For the reaction N_2(g)+3H_2(g) 2NH_3(g) under certain conditions of temperature and partial pressure of the reactants, the rate...
- In a reversible reaction, the function of the catalyst is NOT to _____
- Which of the following statement is FALSE in relation to enzyme?
- The efficiency of an enzyme in catalysing a reaction, is in its ability _____Not in JEE Main or NEET syllabus
- For the reaction A + B C, it is found that doubling the concentration of A increases the rate by 4 times, and doubling the...
- Which of the INCORRECT statement about rate of reaction?
- For the reaction, H_2(g)+I_2(g) 2HI(g) , the rate of reaction is expressed as [CBSE PMT 1997, AIEEE 2002]
- For the reaction N_2O_ 5(g) 2NO_ 2(g) + 12O_ 2(g) the value of rate of disappearance of N_2O_5 is given as 6.25 10^ -3 mol ,L^ -1...
- A gaseous chemical reaction, 2A 4B is carried out in a closed vessel. The concentration of B is found to increase by 5 10^ -3 mol...
- The rate of the reaction 2N_2O_5 4NO_2+O_2 can be written in three ways -d[N_2O_5] dt =k[N_2O_5], d[NO_2] dt =k^ [N_2O_5], d[O_2]...
- In the synthesis of ammonia from nitrogen and hydrogen gases, if 6 10^ -2 mole of hydrogen disappears in 10 minutes, the number...
- Consider the reaction N_2(g)+3H_2(g) 2NH_3(g) . The equality relationship between d[NH_3] dt and - d[H_2] dt is _____ [CBSE PMT...
- For a reaction 12A 2B, rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression _____ [AIEEE...