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A substance 'A' does not dissociate completely into its ions in aqueous solutions. It is bitter in taste and soapy to touch.Identify the substance A.

How many no. of mole are there in CH4 + 2O2 and how?

Which gemstone in its pure form is colourless and can be mistaken for a diamond ?

Vessel which carry blood from heart to all the body parts except heart is:

A metal 'A' reacts with dilute HCl to give metal salt and a gas 'B'. Identify gas is 'B'.

1. 5

Predict the order of reactivity of the following compounds in dehydrohalogenation.

$C_5{H}_{12}$ has a symmetrical structure with one quaternary carbon. Its IUPAC name is:

What is the common name of $\left(a\right)NaHC{O}_{3}and\left(b\right)N{a}_{2}C{O}_3.10H_{2}O$ ?

The solubility of $CuBr$ is $2\times {10}^{-4}$ $mol{L}^{-1}$. at ${25}^{o}C.$ The $K_{sp}$ value for $CuBr$ is:

$\begin{array}{cccccc}& \text{List A}& & \text{List B}& & \text{List C}\\ A.& \text{Rate of reaction}& 1.& -\frac{\Delta \left[A\right]}{\Delta t}=-\frac{d\left[A\right]}{dt}& a.& \Delta H=\text{+ ve}\\ B.& \text{Rate constant of a reaction}& 2.& V_t=V_0& b.& \Delta H=-ve\\ C.& \text{Equilibrium constant}& 3.& V_t\ne V_0& c.& t\to 0\\ D.& V_t=\frac{V_0.t}{273}& 4.& \text{Increases}& d.& \Delta H\to 0\\ E.& V_t=V_0+\frac{V_0.t}{273}& 5.& \text{Decreases}& e.& T\to 0\end{array}$

Upon increasing temperature,

Chemical name of ore of Cu_{​​​​​2}​​​​S ?

What happens to blue vitriol when it is reacted with conc. sulphuric acid?

An element ‘X’ has mass number = 27. If the number of electrons is given as 13, the number of neutrons will be _____.

What is metal reactivity series?

The cathode used to extract pure metal from the ore corundum by electrorefining is ___

In chlor-alkali process, and are released at cathode and anode respectively.

Why cathode is connected to the negative terminal instead of being positive?

An electric current is passed through an aqueous solution of lithium bromide.
What are produced at the cathode and anode respectively?

In Mendeleev's periodic table, why does tellurium with atomic mass =127.6 appear before iodine having atomic mass 126.9?

Odour of sulphur dioxide

Find the correct figure that will replace (i) and (ii).

Which of the following is/are caused by ammonia?

Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. [2 MARKS]

What is calorific value? [1 MARK]

A hydrocarbon having empirical formula as $C{H}_2$ has a density of 1.25g/L. The molecular formula of the hydrocarbon is

Calculate the molecular mass of Na₂CO_3.

Question 12 (a)

Give reason why platinum, gold and silver are used to make jewellery?

$100c{m}_3$ of 1 M $C{H}_{3}COOH$ was mixed with $100c{m}_3$ of 2M $C{H}_{3}OH$ to form an ester. The change in the intial rate if each solution is diluted with equal volume of water would be

Consider the following elements :

Na, Ca, Al, K, Mg, Li

(a) Which of these elements belong to the same period of the periodic table?

(b) Which of these elements belong to the same group of the periodic table?

The solution of one of the following compounds will not conduct electricity. This compound is:
(a) $NaCl$

(b) $CC{l}_4$

(c) $MgC{l}_2$

(d) $CaC{l}_2$

what is enedothermic reaction with one example

Formula for manganese dioxide

Explain physical state and hardness of metals. [3 MARKS]

The unit of electrochemical equivalent is

Which one of the following can be used as monomer in a polymerisation reaction?

[MP PMT 1993]

What happens when (give chemical equation) :
Sodium reacts with ethanol (ethyl alcohol)

Which of the following is liquid at room temperature?

In the compound PCl5 phosphorus has 10 valence electrons. Please explain this.

What will happen if a positively charged and a negatively charged particle collides with each other