In curing cement plaster, water is sprinkled from time to time. Which of the following statements are incorrect? (A) keeping it cool
(B) converting sand in to silicic acid
(C) hydrated sand gravel mixed with cement
(D) developing interlocking needle like crystals of hydrated silicates

In curing cement plasters, water is sprinkled from time to time. This helps in

In curing cement plasters water is sprinkled from time to time. Time helps in

Assertion (A): In curing cement plasters, water is sprinkled form time to time. Reason (R ): It converts sand into silicic acid.

25.Which of the following statement(s) is/are correct about the ionic product of water? A) K_(i) "(ionization constant of water) " B) pK_(i) > pK_(W) C) At 25^(@)C , K_(i) = 1.8times10^(-14) D) lonic product of water at 10^(@)C is 10^(-14)

Five moles of an ideal gas is expanded isothermally from 5dm^(3) to 5m^(3) at 300 K.Which of the following is incorrect about the gas? (A) No heat is absorbed (or) reject by the gas (B) There is no change in internal energy of the gas (c) There is no change in enthalpy of the gas (D) Pressure of the gas will be decrease by 1000 times

Which of the following statements are incorrect statements for acid rain (A) it corrodes water pipes (B) it is not harmful for trees and plants (C) it does not cause breathing problem in human being and animals (D) it damages building and other structures made of stone or metal

Which of the following are chemical changes ? (a) Growth of a plant (b) Rusting of iron (c ) Mixing of iron filings and sand (d) Cooking of food (e ) Digestion of food (f) Freezing of water (g) Burning of a candle