Kelvi

Kelvi

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Diamonds and graphite are both made of pure carbon — just arranged differently.

Kelvi

Kelvi

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Chemistry questions for 2016

Click on a question to view the full question and options.

Consider the molecules $CH_4, NH_3$ and $H_2O.$ Which of the given statements is false ?

In the reaction $H-C \equiv H \xrightarrow[2. CH_3 CH_2Br]{1. NaNH_2/liq. NH_3} X \xrightarrow[2. CH_3CH_2Br]{1. NaNH_2/liq. NH_3} Y.$

Among the following, the correct order of acidity is

The rate of a first-order reaction is $0.04 \,$ mol L $^{-1}$ s $^{-1}$ at $10 \,$

Which one of the following characteristics is associated with adsorption?

In which of the following options, the order of arrangements does not agree with the variation of property indicated against it?

Which of the following statements is false?

Which of the following statements about hydrogen is incorrect?

9. The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon is

$MY$ and $NY_3,$ two nearly insoluble salts, have the same Ksp values of $6.2 \times 10^{-13}$

11. In a protein molecule, various amino acids are linked together by which type of bond?

12. What type of configuration does natural rubber have?

13. Match the items of Column I with the items of Column II and assign the correct code.

Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2Cr_2O_7 \text { solution? }$

15. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

16. Two electrons occupying the same orbital are distinguished by

When copper is heated with conc. $HNO_3$ it produces

18. Which of the following reagents would distinguish cis-cyclopenta-1,2-diol from the trans-isomer?

19. The correct thermodynamic conditions for the spontaneous reaction at all temperatures is

Lithium has a bcc structure. Its density is $520$ kg m $^{-3}$ and its atomic mass is $6.94$ g mol $^{-1}.$

21. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

22. Which of the following is an analgesic?

23. Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape?

Consider the nitration of benzene using mixed conc. $H_2SO_4$ and $HNO_3.$

Predict the correct order among the following in terms of repulsions:

The product obtained as a result of a reaction of nitrogen with $CaC_2$ is

27. Consider the following liquid – vapour equilibrium: Liquid ⇌ Vapour. Which of the following relations is correct?

28. Match the compounds given in Column I with the hybridization and shape given in Column II and mark the correct option.

29. Which of the following has the longest C–O bond length? (Free C–O bond length in CO is 1.128 Å.)

The pressure of H $_2$ required to make the potential of a hydrogen electrode zero in pure water at $298$ K is (in atm).

31. The addition of a catalyst during a chemical reaction alters which of the following quantities?

The ionic radii of A $^{+}$ and B $^{-}$ ions are $0.98 \times 10^{-10}$

33. Which is the correct statement for the given acids?

34. Fog is a colloidal solution of

35. Which of the following statements about the composition of the vapour over an ideal 1L molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given, Vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa)

36. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

37. The reaction below can be classified as

38. The product formed by the reaction of an aldehyde with a primary amine is

39. Which of the following biphenyl compounds is optically active?

40. For the given reactions given below, which of the following statements is correct?

At 100 $°C,$ the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If $K_b = 0.52, \text { the boiling point of this solution will be}$

42. The correct statement regarding RNA and DNA, respectively, is

43. The correct statement regarding the basicity of arylamines is

44. Which one given below is a non-reducing sugar?

The pair of electrons in the given carbanion, $CH_3C \equiv C^{-} ,$ is present in which of the following orbitals?

X and Y are

s and

0.03 \,

mol L

^{-1}

s

^{-1}

at

20 \,

s

after initiation of the reaction. The half-life period of the reaction is (in seconds).

at room temperature. Which statement is true regarding their solubilities?

Calculate the edge length of a unit cell of Lithium metal (in pm).

(NA = 6.02 × 10^{23} mol^{−1})

If a large amount of

KHSO_4

is added to the mixture, the rate of nitration will be

m and

1.81 \times 10^{-10}

m. The coordination number of each ion in AB is