1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by :
A
$$t = {{4.606} \over k}$$
B
$$t = {{2.303} \over k}$$
C
$$t = {{0.693} \over k}$$
D
$$t = {{6.909} \over k}$$
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :
A
10
B
20
C
30
D
40
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
The structure of intermediate A in the following reaction, is : NEET 2019 Chemistry - Alcohol, Phenols and Ethers Question 21 English
A
NEET 2019 Chemistry - Alcohol, Phenols and Ethers Question 21 English Option 1
B
NEET 2019 Chemistry - Alcohol, Phenols and Ethers Question 21 English Option 2
C
NEET 2019 Chemistry - Alcohol, Phenols and Ethers Question 21 English Option 3
D
NEET 2019 Chemistry - Alcohol, Phenols and Ethers Question 21 English Option 4
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
For the second period elements the correct increasing order of first ionization enthalpy is :
A
Li < B < Be < C < N < O < F < Ne
B
Li < Be < B < C < O < N < F < Ne
C
Li < B < Be < C < O < N < F < Ne
D
Li < Be < B < C < N < O < F < Ne