The balancing of chemical equation is based on: - Law of conservation of mass
Fe2O3+ 2Al -Al2O3+2Fe - displacement reaction
What happens when dilute hydrochloric acid is added to iron fillings? - Hydrogen gas and iron chloride are produced.
Which of the below statement is correct regarding to physical changes? - In physical change, no new substance is formed.
Which is not a chemical reaction? - Dissolution of sugar in water
Which is used for white washing ? - CaO
The chemical reactions in which one element takes the position or place of another element present in a compound are known as ............... reaction. - Displacement
When magnesium ribbon is burnt in air, it is observed that it burns brightly leaving behind a .......... powder. - White
The oxidation of oils or fats in a food is known as: - Rancidity
The symbolic representation of an actual chemical change is known as - Chemical equation
The statement of law of conservation of mass is: - mass can neither be created nor destroy.
Which statement is correct regarding to chemical equation? - It gives the information about the heat.
The oxidation and reduction takes place simultaneously in .......... reaction. - redox
Which is correct regarding the oxidizing agent? - It gives oxygen for oxidation.
Which method is used for preventing corrosions? - Both (a) and (b)
A reaction in which a single product is formed from two or more reactants is known as a combination reaction. Is it true or False? - True
Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat. Which type of this chemical reaction? - Combination Reaction
Reaction of ‘magnesium’ with air is - Exothermic reaction
What chemicals are used in fireworks? - All of above
When a magnesium ribbon is burnt in air, the ash formed is - White
Color of magnesium oxide is - White
If magnesium is gently heated, it forms - Magnesium oxide
When carbon dioxide is passed through lime water, - Lime water turns milky
When crystals of lead nitrate are heated strongly in a dry test tube - A brown residue is left
Color of Solid magnesium is - Silver grey
Which of the given products is formed when calcium oxide reacts with water? - Slaked lime
What is the other name for quick lime? - Calcium oxide
What is the chemical name for slaked lime? - Calcium hydroxide
Silver article turns black when kept in the open for a few days due to formation of - Ag₂S
When crystals of lead nitrate are heated strongly in a dry test tube - A brown residue is left
Which of below is/are true about chemical reaction? - All of these
Which of below change is/are chemical change? - All of these
Whenever a chemical change occurs, we can say that a chemical reaction has taken place. Is is true or false? - True
Burning of a magnesium ribbon in air is an example of chemical change. Is it true or False - True
What happens when magnesium is burned in presence of air? - Magnesium oxides is formed.
A chemical equation is reprentation of chemical reaction. Is it true/false? - True
LHS of chemical equation represents........... - Reactants
Number of atoms of all element is not equal in LHS and RHS of any chemical equation then it is a ...................... chemical equation. - Unbalanced
Which gas evolves when Zn reacts with H2SO4? - Hydrogen
Fe + H2O → Fe3O4 + H2 This chemical reaction is balanced. - False
To make a chemical equation more informative, the physical states of the reactants and products are mentioned along with their chemical formulae. - True
Identify the incorrect statement. - Chemical reaction donot invove heat change.
Ferrous sulphate crystals when heated and It gives ferric oxide ,sulphur dioxide and sulphur trioxide . which kind of chemical reaction it is ? - Decomposition reaction
What is the color of AgCl2? - White
What happens when silver chloride kept in sunlight. - It turns into grey due to decomposition.
The chemical formula of lead sulphate is - PbSO4
Which information is not conveyed by a balanced chemical equation? - Whether a particular reaction is actually feasible or not
rust is..... - hydrated ferric oxide
An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are - X = Fe, Y = Fe2O3
Magnesium ribbon is rubbed before burning because it has a coating of - basic magnesium oxide
Which of the following statements about the given reaction are correct? 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent - (i), (ii) and (iv)
Oxidation is a process which involves - addition of oxygen
Reaction of ‘magnesium’ with air is - Exothermic reaction
What is the chemical name for slaked lime? - Calcium hydroxide
What is the other name for quick lime? - Calcium oxide
