Select the correct statement.

Which of the following base is not present in DNA?

Answer the question on the basis of passage given below :
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from +2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Sc, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
For balancing the given reaction, value of \(x\) will be.
\(4 FeCr_2 O_4+Na_2 CO_3+7 O_2 \longrightarrow x Na_2 CrO_4+2 Fe_2 O_3+8 CO_2\)

Gallium and Indium can be prepared by:

Which of the following reaction occurs at anode during discharging of lead storage battery?

Which of the following compounds will undergo Cannizzaro reaction

What will happen during the electrolysis of aqueous solution of \(\text{CuSO}_4\) using platinum electrodes?
A. Copper will deposit at cathode.
B. Copper will deposit at anode.
C. Oxygen will be released at anode.
D. Oxygen will be released at cathode.
Choose the correct answer from the options given below:

Arrange the following steps in sequence of their occurance in the process of genetic modification of an organism.
(A) Cutting of desirable genes and vector DNA by molecular scissors.
(B) Introduction and maintenance of recombinant DNA in the host cell.
(C) Identification of DNA sequence with desirable gene.
(D) Linking of desirable genes with vector DNA.
Choose the correct answer from the options given below :

Arrange the following steps of sewage treatment in correct sequence:
A. Flocs consume organic matter and reduces the BOD.
B. Removal of floating debris and grit.
C. Bacterial flocs allowed to sediment.
D. Primary effluent passed into aeration tank and agitated mechanically.
E. Effluent after secondary treatment is released into water bodies.
Choose the correct answer from the options given below:

The resistance of 1N solution of four different electrolytes are given below. Arrange them in increasing order of their equivalent conductance values if the same conductivity cell was used to measure the resistance of all the electrolytic solutions:
(A) 250 ohm
(B) 150 ohm
(C) 50 ohm
(D) 280 ohm
Choose the correct answer from the options given below:

On which of the following factors angular fringe width does not depend?

Which of the following are autosomal recessive gene disorders?
(A) Thalassemia
(B) Phenylketonuria
(C) Haemophilia
(D) Sickle cell anemia
Choose the correct answer from the options given below:

The area bounded by the curve \(y=-x|x|\), the \(x\)-axis and the ordinates \(x=-1\) and \(x=1\) is given by: