Vapour density of a volatile substance is 4 (CH₄ = 1). Its molecular weight would be:

• 2

• 8

• 64

• 128

20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will :

• be neutral

• be basic

• turn phenolphthalein solution pink

• turn methyl orange red

A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is :

• 182

• 168

• 192

• 188

304.

35.4 mL of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is?

• 0.97 N

• 0.142 N

• 0.194 N

• 0.244 N

The value of amu is which of the following?

• 1.57 $\times$ 10^-24 kg

• 1.66 $\times$ 10^-24 kg

• 1.99 $\times$ 10^-23 kg

• 1.66 $\times$ 10^-27 kg

For a reaction, A + 2B $\to$ C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is :

• 5 mol

• 8 mol

• 16 mol

• 4 mol

Mass of one atom is 6.66 x 10^-23 g. Its percentage in an hydride is 95.24. Thus , hydride is :

• MH

• MH₂

• MH₃

• MH₄

Calculate the radius of a water molecule assuming to be spherical (density= 1 g mL^-1) :

• 1.925 10^-8 cm

• 1.925x 10^-9 cm

• 1.925 10^-10 cm

• 1.925 10^-11 cm

When 6 g of a monobasic acid is dissolved in 100 mL solution , it is l N. What is equivalent mass of the acid ?

• 20 g equiv^-1

• 40 g equiv^-1

• 60 g equiv^-1

• 80 g equiv^-1

When 2.495 g of CuSO₄ · x H₂O (molar mass 249.5) is heated, 0.05 mole of H₂O is lost. Therefore , x is :

• one

• three

• five

• seven