Solid State Class 12th | Crystalline Solid | Unit Cells | NEET & JEE | By Jay Daiya Sir

How many of the given statements are true for potash alum. (1) it is a white crystalline solid (2) it swells up on heating (3) it imparts a golden yellow colour to the bunsen flame (4) An aqueous solution of the above given a white gelatinous precipitate with BaCl_(2) solution soluble only in concentrated sulphuric acid. (5) An aqueous solution of the above given a white gelatinous precipitate on treatment with NH_(4)OH . Which dissolves in aqueous NaOH in excess and reappears, On boiling with concentrated NH_(4)Cl solution. (6) It gives a yellow precipitate with Cobalt nitrile solution. (7) White precipitate in 5^(th) state can also be obtained by passing H_(2)S gas in aqueous solution of the above.

Electricity - 3 |Class - 10th Physics| Science Chapter 12| CBSE NCERT | Rajesh Suthar Sir

Can sodium chloride conduct eletricity in the solid state ? (A)Solids do not conduct electricity. (B)The ions of NaCl become mobile only in molten state and are not free to move in solid state. (C)The crystalline structure does not have ions. (D)When a bond is formed between ions they lose their charges.

Which of the following crystalline solids conduct electricity in molten state but not in solid state?

A : Glass belongs to the category of covalent network solid. R : Unit cell of glass is hexagonal.

How many of the given statement are correct : I : Molar entropy of a substance follows the order (S_(m))_("Solid")lt (S_(m))_("liquid")lt(S_(m))_("gas") II : Entroy change of system for the reaction H_(2)(g) rarr 2H(g) is +ve . III. Molar entropy of a non - crystalline solid will be zero at absolute zero. IV : If the path of an irreversible process is reversed, then both system and surrounding shall be restored to their original states. V: Refractive index and molarity are intensive properties.

Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solid having high melting and boiling points, electrical conductivity in moleten state, solubility in water etc. Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They have low melting and boiling points compounds. They are more soluble in non-polar solvents. The amount of energy released when one mole of ionic solid is formed by packing of gaseous ion is called :

Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solid having high melting and boiling points, electrical conductivity in moleten state, solubility in water etc. Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They have low melting and boiling points compounds. They are more soluble in non-polar solvents. The amount of energy released when one mole of ionic solid is formed by packing of gaseous ion is called :

Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solid having high melting and boiling points, electrical conductivity in moleten state, solubility in water etc. Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They have low melting and boiling points compounds. They are more soluble in non-polar solvents. The valence electrons are involved in formation of covalent bonds is /are called :