Which one of the following is acidic?

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Which one of the following will turn red litmus blue?

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Which one of the following will turn blue litmus red?

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Methyl orange is

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Lime water is

The nature of calcium phosphate is present in tooth enamel is

Which of the following salts has no water of crystallization?

The function of quick lime in soda lime mixture is to

The Ph of a solution of HCL is 4. This shows that the molarity of the solution is

The difference of molecules of water in gypsum and PoP is

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Which of the following does not form an acidic salt?

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The chemical formula of caustic potash is

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The chemical formula of lead sulphate is

Which information is not conveyed by a balanced chemical equation?

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Chemically rust is

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Both CO₂ and H₂ gases are

Which of the following gases can be used for storage of fresh sampel of an oil for a long time?

The electrolytic decomposition of water gives H₂ and O₂ in the ratio of

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

Fatty foods become rancid due to the process of

We store silver chloride in a dark coloured bottle because it is

Silver article turns black when kept in the open for a few days due to formation of

When crystals of lead nitrate are heated strongly in a dry test tube

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.

When carbon dioxide is passed through lime water,

When a magnesium ribbon is burnt in air, the ash formed is

In which of the following, heat energy will be evolved?

Rancidity can be prevented by

The reaction of H₂ gas with oxygen gas to form water is an example of

The reaction in which two compound exchange their ions to form two new compounds is called

On immersing an iron nail in CuSO₄ solution for few minutes, you will observe

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are

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Which of the following metals is present in the anode mud during the electrolytic refining of copper?

An element reacts with oxygen to give a compound with a high melting point. The compound is soluble in water. The element is likely to be

The second most abundant metal in the earth’s crust is

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An alloy of Zn and Cu is dissolved in dil. HC1. Hydrogen gas is evolved. In this evolution of gas

A greenish coating develops on copper utensils due to formation of

Rusting of iron takes place in

The bronze medals are made up of

Silver articles becomes black on prolonged exposure to air. This is due to the formation of

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During smelting, an additional substance is added which combines with impurities to form a fusible product known as

A student placed an iron nail in copper sulphate solution. He observed the reddish brown coating on the iron nail which is

Which among the following alloys contain non-metal as one of its constituents?

An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that

14 elements after actinium is called

An element has an atomic number of 15 with which of the following elements will it show similar chemical properties.

The group number and period number respectively of an element with atomic number 8 is.

An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is.

In the third period of the periodic table the element having smallest size is

Electronic configuration of Al+3 is