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Which charge does hydrogen consists of +ve or -ve

$Zn+H_{2}S{O}_4(conc.)⟶?$ is an example of which property of sulphuric acid?

When conc. sulphuric acid is added to sodium chloride, sodium bisulphate and gas X is formed. If a rod dipped in ammonia is brought near gas X, dense white fumes of ammonium chloride are formed. What is X?

Aluminium reacts with steam to produce a layer that protects it from further reaction. Enter the name of the compound (text) here: ___.

The electronic configurations of three elements X, Y, and Z are as follows:
X=2,4

Y=2,7

Z=2,1

(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.

Explain giving the equation, what happens when :
(a) $ZnC{O}_3$ is heated in the absence of air?
(b) A mixture of $C{u}_{2}O$ and $C{u}_{2}S$ is heated?

Which is the principal ore of $Al$?

Assertion [A]: Food chains start with photosynthesis and end with decomposition.
Reason [R]: In an ecosystem, plants produce food and decomposers help in the decay of dead matter.

Why covalent bonds usually have lower melting point?

One mole of solute NaCl is dissolved in liter water.

the molarity of the solution is

1) 1 mg of $C_4{H}_{10}$ 2) 1 mg of $N_2$ 3) 1mg of sodium 4) 1 molar

Which shape does ammonia molecule have?

What is Crystallisation and Crystalline Salt?

Which of the following is most electronegative

Which of the following is a mild oxidizing agent?

The law of conservation of mass states ____.

The oxide(s) of iron that would be obtained on its prolonged reaction with steam is

The salt whose aqueous solution will have no effect on either red litmus or blue litmus is

(a) potassium sulphate

(b) sodium carbonate

(c) ammonium sulphate

(d) sodium acetate

State an observation in an activity which may suggest that a chemical reaction has taken place.Give examples in support of your answer.

Match the column:
$\begin{array}{cccc}& & & \\ & \text{Column-I}& & \text{Column-II}\\ \left(\text{a}\right)& \text{Anglesite}& \left(\text{p}\right)& \text{Sulphate ore}\\ \left(\text{b}\right)& \text{Galena}& \left(\text{q}\right)& \text{Sulphide ore}\\ \left(\text{c}\right)& \text{Cerussite}& \left(\text{r}\right)& \text{Ore of Pb}\\ \left(\text{d}\right)& \text{Cinnabar}& \left(\text{s}\right)& \text{Carbonate ore}\\ & & \left(\text{t}\right)& \text{Ore of Hg}\end{array}$

^{Blanced chemical equation for the reaction}

^{Aluminium chloride + Ammonium hydroxide -- Aluminium hydroxide +Ammonium chloride}

Which of the following gas is produced by roasting iron pyrites in air?

What happens to the electrons losed by the photons which carryied photoelectric effect

Which of the following is incorrect?

Question 48
(a) What are hydrocarbons? Give examples.
(b) Give the structural difference between saturated and unsaturated hydrocarbons with two examples of each.
(c) What is a functional group? Give examples of four different functional groups.

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?

(a) The elements become less metallic in nature. (b) The number of valence electrons increases.

(c) The atoms lose their electrons more easily (d) The oxides become more acidic.

Coal is a/an _________ natural resource.

How did atomic number prove a better basis for the classification of elements?

De-Broglie wavelength of $e^{-}$ in third Bohr orbit of hydrogen atom is

Which of the following orders of increasing energy of orbitals is incorrect?

The electronic configurations of atoms of three elements A. B and C are (2, 8, 1), (2, 8, 6) and (2, 8, 18, 7) respectively.
Which option classifies the elements A. B and C as metals and non-metals correctly?

Classify bases on the basis of their strength.

In photosynthesis the light energy (from the sun) is converted to chemical energy which can be used to perform the activities of the organism. This is an example of ________________ reaction.

In the reaction $M$ + $O_2$ $\to$ $M{O}_2$ (super oxide) the metal is:

Mercury does not reacts with sulphuric acid. This happens because:-

The number of $\pi$ electrons present in the benzene ring are

s - character in ${sp}^3$ hybridization is:

Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Will the impact of removing all the organisms in a trophic level be different for different trophic levels?

What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?

In the presence of $CC{l}_4$ what is the end product in this reaction ?$C{H}_2=C{H}_2+C{l}_2\to$

What is the Structural formula of Pentane?

Which among the following is an example of gas in gas solution?