HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

What type of point defect is produced when AgCl is doped with CdCl₂?

Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10⁻² g of K₂SO₄ in 2L of water at 25°C, assuming that it is completely dissociated.

(R = 0.0821 L atm K⁻¹ mol⁻¹, Molar mass of K₂SO₄ = 174 g mol⁻¹)

What is molecular formula of oleum?

(a) H₂SO₃

(b) H₂SO₄

(c) H₂S₂O₇

(d) H₂S₂O₈

Which of the following is not a colligative property?

[NiCl₄]²⁻ is paramagnetic, while [Ni(CO)₄] is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)

What happens when the external pressure applied becomes more than the osmotic pressure of solution?

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing

(i) 1.2% sodium chloride solution?

(ii) 0.4% sodium chloride solution?

Define the following term

Schottky defect

Which stoichiometric defect does not change the density of the crystal?

Which stoichiometric defect decreases the density of the crystal?

test q 1234

Answer the following.

List the uses of Neon and argon gases.

Calculate ΔH° for the reaction between ethene and water to form ethyl alcohol from the
following data:

ΔcH° C₂H₅OH_(l) = -1368 kJ
ΔcH° C₂H_4(g) = -1410 kJ
Does the calculated ΔH° represent the enthalpy of formation of liquid ethanol?

Calculate the standard enthalpy of combustion of CH₃COOH(l) from the following data:

`Delta_fH^@(CO_2)=-393.3 kJ mol^-1`

`Delta_fH^@(H_2O)=-285.8 kJ mol^-1`

`Delta_fH^@(CH_3COOH)=-483.2 kJ mol^-1`

What is the action of concentrated sulphuric acid on phosphorous pentachloride

Define osmotic pressure.

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on aniline

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on diethyl amine

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on triethyl amine

Schottky defects are observed in which solid among the following?

(a) Brass

(b) Cesium Chloride

(c) Zinc sulphide

(d) Stainless steel