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Which of the following substances is used for supporting fractured bones?

Beaker ‘A’ contains $CuS{O}_4$ solution and zinc pieces. Beaker ‘B’ contains $ZnS{O}_4$ solution and copper pieces. Chemical reaction will take place in -

When a compound X is dissolved in water, it dissociates as shown below:

$X\to A$ + $O{H}^{-}$

Here X is:

Argon – 40 and calcium – 40 are the examples of:

Which of the following halogens doesn't exhibit positive oxidation state in its compounds?

Magnesium chloride is an ionic compound while hydrogen chloride is a covalent compound. But both form ions in their aqueous solutions. Explain

Calculate the number of molecules in 3/2 litres of water.

Which of the following reaction takes place at the cathode during electrolysis of molten magnesium chloride?

Which of the following has the weakest carbon-carbon bond strength?

Match the following alkyl radicals with their correct chemical formula:

$\begin{array}{cc}\text{Radical Formula}& \text{Radical Name}\\ \text{(i)}{\text{CH}}_3& \text{(a)}\text{Methyl Radical}\\ \text{(ii)}{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{CH}}_2& \text{(b)}\text{Ethyl Radical}\\ \text{(iii)}{\text{CH}}_3{\text{CH}}_2& \text{(c)}\text{Propyl Radical}\\ \text{(iv)}{\text{CH}}_3{\text{CH}}_2{\text{CH}}_2& \text{(d)}\text{Butyl Radical}\end{array}$

Which of the following has covalent radius more than germanium?

(a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?

(b) Write the equation for the reaction of dilute nitric acid and conc. nitric acid with copper.

A solution reacts with crushed egg shells to give a gas that turns lime water milky.The solution contains:

Under what conditions rusting of iron takes place?

IUPAC name of the following compound is $C{H}_3-CH=CH-C\equiv CH$

A sulphide ore is converted into metal oxide by the process of :
(a) Carbonation (b) roasting (c) calcination (d) anodising

The correct order of ionic radii of the species $N^{3-},O^{2-},N{a}^{+}$ and $F^{-}$ is:

The reaction in which chlorine atom replaces hydrogen atom in a molecule of ethanol is called

What ions are present in the solutions of the following substances? (Write the symbols only)

(i) Hydrochloric acid

(ii) Nitric acid

(iii) Sulphuric acid

(iv) Sodium hydroxide

(v) Potassium hydroxide

(vi) Magnesium hydroxide

Wasp sting contains:

(a) a sugar solution

(b) an acidic liquid

(c) a salt solution

(d) an alkaline liquid

Which of the following belong to the same trophic level? Goat; Spider; Plants; Hawk; Rat

The drying agents like $P_2{O}_5$ and CaO cannot be used to dry hydrogen chloride gas because:

Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.

(a) Explain the term "rancidity". What damage is caused by rancidity ?

(b) What type of chemical reaction is responsible for causing rancidity ?

(c) State and explain the various methods for preventing or retarding rancidity of food.

For the reaction $A+B\to C+D\Delta H=-20kJmo{l}^{-1}$ . The activation energy of the forward reaction is $85kJmo{l}^{–1}$. The activation energy for backward reaction is

The perfect gas equation is PV = nRT where n is the

The total weight of ${10}^{22}$ molecular units of $CuS{O}_4.5H_{2}O$ is nearly

Total number of orbitals present in l = 2 is

The complete combustion of $C{H}_4$ gives

In the process of extraction of Aluminium, Bauxite is mixed with cryolite so as to -

What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene [C2H4] at 273∘C and 380 mm of Hg pressure?
C2H4+3O2→2CO2+2H2O

How is water absorbed in small intestine

What happens when HCl gas is heated above ${500}^{0}C$?

$Be$ has 2 electrons in its outer shell, $O$ has 6 electrons in its outer shell. Choose the correct option:

Which of the following cation is blue in colour?

Galvanizing is __________.

Mostly oxides of non-metals are:

In a first-order reaction $A\to B,$ if k is rate constant and initial concentration of the reactant A is 0.5 M then the half-life is:

Given below are some elements of the modern periodic table:

_{$4^{Be},9^{Fe},{14}^{Si},{19}^K,{20}^{Ca}$}

(i)Select the element that has one electron in the outermost shell and write its electronic configuration.

(ii)Select two elements that belong to the same group. Give reason for you answer.

(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?

(a) Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
(b) What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give the chemical equation of the reaction involved.

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker ? Is it a strong or a weak acid ?

X and Y are the two elements having similar properties which obey Newland’s law of octaves. How many elements are there in-between X and Y?