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

The cooling in refrigerator is due to :

• the reaction of the refrigerator gas

• the expansion of ice

• the expansion of the gas in the refrigerator

• the work of the compressor

3.

In an exothermic equilibrium ,

A + 3B $\rightleftharpoons$ AB₃

all the reactants and products are in gaseous state. The formation of AB₃ is favoured at :

• low temperature and low pressure

• low temperature and high pressure

• high temperature and high pressure

• high temperature and low pressure

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

• 182

• 168

• 192

• 188

The line spectrum of He⁺ ion will resemble that of :

• hydrogen atom

• Li⁺ ion

• helium atom

• lithium atom

0.5 mole of each of H₂ , SO₂ and CH₄ are kept in a container. A hole was made in the container . After 3h , the order of partial pressures in the container will be :

• pSO₂ > pH₂ > pCH₄

• pSO₂ > PCH₄ > pH₂

• pH₂ > pSO₂ > pCH₄

• pH₂ > pCH₄ > pSO₂

An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g mL^-1 and 50.5 g when filled with an ideal gas at 760 mm Hg and 300 K. The molar mass of the ideal gas is :

[R = 0.0821 L atm K^-1 mol^-1]

• 61.575

• 130.98

• 123.75

• 47.87

A body of mass x kg is moving with a velocity of 100 ms^-1. Its de-Broglie wavelength is 6.62 x 10^-35 m. Hence, x is :

[h = 6.62 x 10^-34Js]

• 0.1 Kg

• 0.25 Kg

• 0.15 Kg

• 0.2 Kg

A precipitate of AgCl is formed when equal volumes of the following are mixed :

[K_sp for AgCl = 10^-10]

• 10^-4 M AgNO₃ and 10^-7 M HCl

• 10^-5 M AgNO₃ and 10^-6 M HCl

• 10^-5 M AgNO₃ and 10^-4 M HCl

• 10^-6 M AgNO₃ and 10^-6 M HCl

Pick out the incorrect statement from the following :

• sp hybrid orbitals are equivalent and are at an angle of 180° with each other

• sp² hybrid orbitals are equivalent and bond angle between any two of them is 120°

• sp³d² hybrid orbitals are equivalent and are oriented towards corners of a regular octahedron

• dsp² hybrid orbitals are equivalent with a bond angle of 90° between the two atoms