Which of the following statements about the given reaction 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g) are correct?

Which of the following are exothermic processes?

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 Identify the substance reduced in the above equation.

Ethane (C2H6) on complete combustion gave CO2 and water. It shows that the results are in accordance with the law of conservation of mass. Then, the coefficient of oxygen is equal to

The science teacher said to Sahil to perform an experiment with lead nitrate and potassium iodide. He done the following steps under the observation of teacher. 1. Take lead nitrate solution in a beaker. 2. Take potassium iodide solution in a test tube. (Both solutions are colourless). 3. Add potassium iodide solution slowly to the lead nitrate solution. Which chemical reaction take place here?

Four students A B C and D were asked to carry out a decomposition reaction. Each one followed different method as mentioned – 1) Heated aqueous solution of iron sulphate in a test tube 2) Added Zn granules to iron sulphate in a test tube and then heated the mixture 3) Heated crystals of iron sulphate in a test tube 4) Heated crystals of iron sulphate along with copper sulphate crystals in a china dish The student who adopted the correct method is

Identify gas A in the following experiment.

Magnesium ribbon burns in air with a dazzling white flame. This is due to the formation of a white solid. This white solid dissolves in water and gives a solution which turns red litmus blue. Which type of reaction is performed in above process?

Decomposition reaction required energy in the form of ................. For breaking down the reactant.

A substance X, an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X.

To facilitate the electrolysis of water we add a few drops of acids like sulphuric acid or salts like NaCl because-

Write values of a,b and c if following chemical reaction is balanced. aMg + bO2 → cMgO

Which of the following reaction is not balanced

When petrol, in the presence of oxygen gas, burns inside the engine of a car, carbon dioxide and water are produced. The temperature inside the engine becomes very high. Which of the following statements is correct?

This process is triggered by light energy Two ions present in the BaSO4.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

Which information is not conveyed by a balanced chemical equation?

2AgCl ---------------→- ?

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the given can be used in place of lead nitrate?

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified potassium permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the given equation is the correct explanation for the observation?

In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is

Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?

Assertion (A) : Iron articles get coated with reddish brown powder when left for some time in the open. Reason (R ) : Iron is attacked by substances around it such as moisture, acids, etc.

What happens when sodium hydroxide is added to a test tube containing zinc and the content is heated?

Limestone and chalk are different forms of compound ‘A’. When excess of moist CO2 is passed through insoluble ‘A’, it results in formation of soluble Compound ‘B’ which is:

Milk of Magnesia is recommended by doctors to get relief from acidity as it involves:

On addition of Copper oxide to dilute hydrochloric acid with constant stirring, the colour of the solution changes to blue green. The blue green colour of the solution is due to the formation of:

Which of the following statements is not true:

While diluting sulphuric acid utmost care is taken care of as adding water to sulphuric acid is:

The correct match pair among the following is:

The word ‘acid’ is derived from Latin word ‘Acidus’ which means sour. Acids are present in various components. The acid present in Tamarind, Gastric juice, Sting of neetle plant, curd are respectively:

There are 4 test tubes containing solution of Vinegar, Baking soda, Sodium Chloride and Sodium hydroxide respectively. The pH of the four solutions respectively are:

Which among the following is not correctly matched:

Which statement is not true about Chlor-alkali process in which electricity is passed through aqueous solution of NaCl:

Megha has kept curry made of Curd in copper container for overnight and found that the curry get spoiled. This is because:

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

Which of the following statements is correct about an aqueous solution of an acid and of a base?

Tooth enamel is made up of:

While checking electric connections in rainy season, the electrician touched the electric pole and get electrocuted. This happened because:

Rahul spill the milk on pH paper and the paper appeared light green in colour but when he spilled curd on pH paper the colour changes to orange. This is because:

The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity. Which of the following statement(s) is (are) correct?

Brine is an:

In terms of acidic strength, which one of the following is in the correct increasing order?

When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

Which one of the following salts does not contain water of crystallisation?

Sodium hydroxide is used:

A white coloured powder used by the doctors for supporting fractured bones as well as it forms a solid mass when mixed with water. The white powder used is:

Lime water reacts with chlorine to give:

When Zinc metal reacts with hydrochloric acid, the gas liberated burns with pop sound when a burning matchstick brought near it, the gas liberated is:

The constituent of baking powder which neutralizes the bitterness due to sodium carbonate produced is:

Mixing of acid or base with water results in ......... in the concentration of ions per unit volume:

A white colour powder ‘A’ used in glass and paper industry and removes permanent hardness of water. The compound ‘A’ is:

What is not true about bleaching powder:

In which of the following applications of Iron rusting will appear most?

Based on the above observations, the correct order of increasing reactivity will be

Which option classifies the substances into metals and non-metals?

The atomic numbers of four elements A, B, C and D are 6, 8, 10 and 12 respectively. The two elements which can react to form ionic compounds are

Which option classifies the substances based on their physical properties?

Which of the following elements were discarded for usage by the company?

What is the reason for different behavior of Mg in test tube B?

The elements whose oxides can turn phenolphthalein solution pink are:

An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has the smell of rotten eggs, the element X is likely to be

The elements whose oxides can turn red litmus solution blue are:

An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be

An element E reacts with water to form a solution which turns phenolphthalein solution pink, the element E is most likely to be

Which of the following two combinations are correct Metal Gas evolved?

In thermite welding a mixture of and is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved.

Which among the following statements is incorrect for magnesium metal?

Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3, is a strong oxidising agent. It oxidizes the H, produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2). But and react with very dilute HNO3 to evolve H2 gas.

Which of the following represents the correct order of reactivity for the given metals?

On the basis of sequence of reactions, identify the most and least reactive elements.

A clean aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after 15 minutes, its surface was found to be coated with a silvery grey deposit. From the above observation it can be concluded that:

The process of purification of the metal obtained after reduction is called:

Which of the metals are refined by electrolytic refining?

During electrolytic refining of zinc, it gets

In electrolytic refining of copper, impure copper act as and pure copper as :

The anode is and the reaction at the (C) anode is .

Based on the above observations, answer the following Out of the given metals, the metal Q is

The metal which forms amphoteric oxides is:

The increasing order of the reactivity of the four metals is: