Which one of the following statements for D.I. Mendeleeff, is incorrect?

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

Which of the following compounds will provide a tertiary alcohol or reaction with excess of CH₃MgBr followed by hydrolysis?

Which of the following compounds does not exhibit resonance?

In the chemical reactions given above A and B respectively are :

Isotope(s) of hydrogen which emits low energy $$\beta$$^$$-$$ particles with t_1/2 value > 12 years is/are

Match List-I with List-II :

	List-I (Species)		List-II (Hybrid Orbitals)
(a)	$$S{F_4}$$	(i)	$$s{p^3}{d^2}$$
(b)	$$I{F_5}$$	(ii)	$${d^2}s{p^3}$$
(c)	$$NO_2^ + $$	(iii)	$$s{p^3}d$$
(d)	$$NH_4^ + $$	(iv)	$$s{p^3}$$
		(v)	$$sp$$

Choose the correct answer from the options given below :

Which of the following molecules does not show stereo isomerism?

Which one of the following group-15 hydride is the strongest reducing agent?

The set having ions which are coloured and paramagnetic both is :

Thiamine and pyridoxine are also known respectively as :

An organic compound A (C₆H₆O) gives dark green colouration with ferric chloride. On treatment with CHCl₃ and KOH, followed by acidification gives compound B. Compound B can also be obtained from compound C on reaction with pyridinium chlorochromate (PCC). Identify A, B and C.

Which one of the following reactions does not occur?

Which one of the following 0.06 M aqueous solutions has lowest freezing point?

The total number of unpaired electrons present in [Co(NH₃)₆]Cl₂ and [Co(NH₃)₆]Cl₃ is :

Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene __________. (Nearest integer)

The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________

Assume a cell with the following reaction

$$C{u_{(s)}} + 2A{g^ + }(1 \times {10^{ - 3}}M) \to C{u^{2 + }}(0.250M) + 2A{g_{(s)}}$$

$$E_{cell}^\Theta = 2.97$$ V

E_cell for the above reaction is ______________ V. (Nearest integer)

[Given : log 2.5 = 0.3979, T = 298 K]

Value of K_P for the equilibrium reaction

N₂O_4(g) $$\rightleftharpoons$$ 2NO_2(g) at 288 K is 47.9. The K_C for this reaction at same temperature is ____________. (Nearest integer)

(R = 0.083 L bar K^$$-$$1 mol^$$-$$1)

If the standard molar enthalpy change for combustion of graphite powder is $$-$$2.48 $$\times$$ 10² kJ mol^$$-$$1, the amount of heat generated on combustion of 1 g of graphite powder is ___________ kJ. (Nearest integer)

Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________

$${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + {1 \over 2}{O_{2(g)}}$$

In the above first order reaction the initial concentration of N₂O₅ is 2.40 $$\times$$ 10^$$-$$2 mol L^$$-$$1 at 318 K. The concentration of N₂O₅ after 1 hour was 1.60 $$\times$$ 10^$$-$$2 mol L^$$-$$1. The rate constant of the reaction at 318 K is ______________ $$\times$$ 10^$$-$$3 min^$$-$$1. (Nearest integer)

[Given : log 3 = 0.477, log 5 = 0.699]

If the concentration of glucose (C₆H₁₂O₆) in blood is 0.72 g L^$$-$$1, the molarity of glucose in blood is ____________ $$\times$$ 10^$$-$$3 M. (Nearest integer)

[Given : Atomic mass of C = 12, H = 1, O = 16 u]