Enzymes are biological catalysts. They accelerate biological reactions. Which of the following is not true about enzymes?

The basicity of \(\text{H}_3\text{PO}_4\) is :

Which of the following is a molecular solid?

Which of the following reaction will not produce ketones?

\(\text{C-Cl}\) bond in chlorobenzene in comparison to \(\text{C-Cl}\) bond in methyl chloride is :

Read the passage carefully and answer the questions
Optically active polyhydroxy aldehydes or ketones or molecules which provide such units on hydrolysis are called carbohydrates. They can be broadly classified as monosaccharides, disaccharides and polysaccharides depending on their behavior towards hydrolysis. They are also classified as reducing or non-reducing sugars. Another class of biomolecules is proteins which are polymers of twenty different amino acids linked by peptide bonds. Amino acids can be classified as acidic, basic or neutral depending on the relative number of amino and carboxyl groups in their molecule. The essential amino acids cannot be synthesized by our body and hence must be provided through diet. Nucleic acids are the polymers of nucleotides which in turn consist of a base, pentose sugar and phosphate. There are two types of nucleic acids namely, DNA and RNA which differ in the composition of sugar and a base.
Four bases present in RNA molecule are:

The IUPAC name of the given compound is

Let \(\theta\) be the angle between two vectors \(\vec{a}\) and \(\vec{b}\). Then match List-I with List-II

List-I	List-II
(A) \(\sin \theta\)	(I) \(\frac{\vec{a} \cdot \vec{b}}{|\vec{a}||\vec{b}|}\)
(B) \(\cos \theta\)	(II) \(|\vec{a} \times \vec{b}|\)
(C) Area of the parallelogram with adjacent sides represented by \(\vec{a}\) and \(\vec{b}\)	(III) \(\frac{\vec{a} \cdot \vec{b}}{|\vec{a}|}\)
(D) Projection of \(\vec{a}\) on \(\vec{b}\)	(IV) \(\frac{|\vec{a} \times \vec{b}|}{|\vec{a}||\vec{b}|}\)

Choose the Correct answer from the options given below :

If \(A=\left[\begin{array}{ll}5 & 6 \\ 3 & 2\end{array}\right]\), then which of the following is correct?
(A) \(|A|\) is positive
(B) \(|a d j A|=-8\)
(C) Cofactor of 3 is 6
(D) \(|2 A|=-32\)
Choose the correct answer from the options given below :

The ratio of densities of nuclei with mass numbers A and 2A, respectively is

An astronomical telescope uses an objective lens of focal length 30 cm. In normal adjustment, distance between the two lenses is 32 cm. The magnifying power of telescope is:

The characteristic oxidation state of Lanthanoids is +3, but Ce shows +4 oxidation state because…
(A) It has variable ionization enthalpy
(B) It has a tendency to attain noble gas configuration
(C) It has a tendency to attain \(f^0\) configuration
(D) It resembles \(\mathrm{Pb}^{4+}\)

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
((B) The potentiometer is unaffected by the internal resistance of the source.
((C) In ionic crystals and electrolytic liquids electrons carry the electric current.
((D) Ohm's law fails if V depends on I non-linearly.
((E) Kirchhoff's rules are used for analysis of electric circuits.
(Choose the correct answer from the options given below :