introduction

Q.

What happens when silver chloride is exposed to sunlight? Write a chemical equation for this reaction.

Q.

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species

1. Cl<F<S<O

2. S<O<Cl<F

3. O<S<F<Cl

4. F<Cl<O<S

Q.

How do you determine which oxidizing agent is strong?

Q. Difference between Schottky and Frenkel defects

Q.

Which of the following will decolourise bromine water?

1. ${\mathrm{C}}_4{\mathrm{H}}_6$

2. ${\mathrm{C}}_2{\mathrm{H}}_4$

3. ${\mathrm{C}}_6{\mathrm{H}}_{10}$

4. None of these

Q. Which of the following has an aldehyde functional group?

1. $R-CHO$
2. $R-COOH$
3. $R-CO-R$
4. $R-CO-N{H}_2$

Q. The reaction of $HCl{O}_3$ with $HCl$ gives a paramagnetic gas, which upon reaction with $O_3$ produces

1. $Cl{O}_2$
2. $C{l}_2{O}_6$
3. $C{l}_2{O}_7$
4. $C{l}_{2}O$

Q.

What are the elements of group $\mathrm{VII}$ called?

Q.

Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

Q. In Kjeldahl’s method, nitrogen present is estimated as:

1. $N_2$
2. $N{H}_3$
3. $N{O}_2$
4. None of these

Q. The Beilstein test for organic compound is used to detect

1. Sulphur
2. Halogen
3. Carbon
4. Nitrogen

Q.

Is hydrogen a alkali metal or not?and why?

Q.

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning Sulphur. Write the chemical reaction involved and identify the type of reaction.

Q.

$\mathrm{Calgon}$ is used for water treatment. Which of the following statements is NOT true about $\mathrm{Calgon}$ ?

1. $\mathrm{Calgon}$ contains the second most abundant element by weight in the earths crust.

2. It is also known as$\mathrm{Graham}’\mathrm{s}\mathrm{salt}$.

3. It is a polymeric compound and is water-soluble.

4. It does not remove ${\mathrm{Ca}}^{2+}$ion by precipitation.

Q. The correct order of stability of difluoride is:

1. $Ge{F}_2>Si{F}_2>C{F}_2$
2. $C{F}_2>Si{F}_2>Si{F}_2$
3. $C{F}_2>Ge{F}_2>Si{F}_2$
4. $Si{F}_2>Ge{F}_2>C{F}_2$

Q. Lead nitrate on heating gives lead oxide, $N{O}_2$ and oxygen. This reaction is

1. Combustion
2. Combination
3. Displacement
4. Decomposition

Q. What change in colour is observed when white silver chloride is left exposed in sunlight? State the type of chemical reaction and also write its chemical equation.

Q. Preparation of lassaigne filtrate

Q.

Scandium belongs to which block of elements?

Q. The order of ionic radius given here is incorrect. Write the correct order and explain the reason. Na+ > Li+ > Mg2+ > Be2+ > Al3+

Q. Is it really Necessary to learn the whole PERIODIC TABLE? If Yes then how to do so?

Q.

How is chloride of lime chemically different from calcium chloride? Why does the chloride of lime gradually lose its chlorine when kept exposed to air?

Q. 0.15 g of an organic compound gave 0.12g of AgBr by Carius method. The % of bromine in the Compound is(Molar mass of AgBr=188)

1. 24.08
2. 34.04
3. 42.06
4. 38.96

Q. Given below are two statements: One is labelled as AssertionA and the other is labelled as Reason R.
Assertion A : Flourine forms one oxoacid.
Reason R : Flourine has smallest size amonst all halogens and is highly electronegative.
In the light of the above statements, choose the most appropriate answer from the options given below.

1. Both A and R correct and R is the correct explanation of A.
2. Both A and R are correct but R is NOT the correct explanation of A.
3. A is not correct but R is correct .
4. A is correct but R is not correct .

Q.

Why in the redox titration of $KMn{0}_4$ vs oxalic acid, we heat oxalic acid solution before starting the titration?

Q. The maximum number of electrons that can be identified with the quantum number l=2 for Fe3+ ion will be 1.3 2.4 3.5 4.6

Q. Higher density halogen decreasing order...?

Q. Positive Beilstein test for halogen shows that

1. none of these
2. a halogen may be present
3. a halogen is definitely present
4. a halogen is absent

Q. Victor Meyer test is not given by:

1. $C_2$$H_5$$OH$
2. ${\left(C{H}_3\right)}_{3}C-OH$

3. $C{H}_{3}C{H}_{2}C{H}_{2}OH$

4. ${\left(C{H}_3\right)}_{2}CHOH$

Q. For the estimation of nitrogen, $1.4g$ of an organic compound was digested by Kjeldahl's method and the evolved ammonia was absorbed in $60mL$ of $M/10$ sulphuric acid. The unreacted acid required $20mL$ of $M/10$ sodium hydroxide for complete neutralisation. The percentage of nitrogen in the compound is:

1. 6%
2. 10%
3. 3%
4. 5%