11.

When one mole of A and one mole of B were heated in one litre flask at T(K), 0.5 mole of C was formed in the equilibrium,  A + B  C + D the equilibrium constant, K_c is

• 0.25

• 0.5

• 1

• 2

If the solubility of Ca₃(PO₄)₂ in water is x mol L^-1, its solubility product in mol⁵L^-5 is

• 6x⁵

• 36x⁵

• 64x⁵

• 108x⁵

What is the weight (in gram) of Na₂CO₃ (molar mass = 106) present in 250 mL of its 0.2 M solution? 

• 0.53

• 5.3

• 1.06

• 10.6

The buffer system which helps to maintain the pH of blood between 7.26 to 7.42, is

• H₂CO₃ /HCO${}_3^{-}$

• NH₄OH/ NH₄Cl

• CH₃COOH/ CH₃COO^-

• CH₃COONH₄

An organic compound having C, H and O has 13.13% H, 52.14%C and 34.73 % 0. Its molar mass is 46.068 g. What are its empirical and molecular formulae?

• C₂H₆O, C₄H₁₂O₂

• C₂H₆O, CH₃O

• C₂H₆O, C₂H₆O

• C₂H₆O, C₃H₉O₄

White metal is an alloy of

• Na and Mg

• Na and Pb

• Li and Mg

• Li and Pb

Which one of the following elements does not form triiodide on reacting with iodine?

• B

• Ti

• Al

• Ga

In municipal sewage, BOD values (in ppm) are:

• 1-5

• 100- 4000

• 50-90

• 20-40

Two bonds N=O and N-O in H₃CNO₂ are of same bond lenght due to

• Inductive effect

• hyperconjugation

• electromeric effect

• resonance effect

Assertion (A): Reaction of 1-butene with HBr gives 1-bromobutane as major product.

Reason (R): Addition of hydrogen halides to alkenes proceeds according to Markownikoffs rule.

The correct answer is

• A and R are correct and R is the correct explanation of A

• A and R are correct but R is not the correct explanation of A.

• A is correct but R is not correct

• A is not correct but R is correct