Physical and Chemical Properties of Hydrogen

Q. 55 Balance the equation by oxidation no. method. MnO4 -- + Br- this give us Mn2+ + Br2

Q.

2. Two substance I and II of carbon and oxygen have respectively 72.73% and 47.06% oxygen hence they follow

Q. Q. How many moles of alumina can be formed when a mixture of 0.36 mol of Aluminium and 0.36 mol of Oxygen are ignited. Which substance and how much its in excess of that required ?

Q. the oxidation state of oxygen in the following reaction changes, K+O2 becomes KO2

Q. Select correct order of electronegativity :-(1) SbF_5 (EN of Sb atom)> SbF_3(EN of Sb atom)(2) CH_4(EN of C-atom) > CO_2(EN of C-atom)(3) Cu^+ (EN) > Cu^2(EN)(4) 1 and 2 both are correct

Q.

Hydrogen by donating one electron forms $H^{+}$. In this property, it resembles with

1. Transitional metals

2. Alkaline earth metals

3. Alkali metals

4. Halogens

Q. 2. Why does kerosene burn with a blue flame in wick stove but produces a yellow flame when burnt in a lamp

Q. H_2O and H_2O_2 resemble in (1) Hybridisation of oxygen (2) oxidation state of oxygen (3) structure (4) Bond angl

Q.

The correct decreasing order of reactivity among the following is

1. Nascent hydrogen > atomic hydrogen > molecular hydrogen

2. Molecular hydrogen > Nascent hydrogen > atomic hydrogen

3. Atomic hydrogen > molecular hydrogen > nascent hydrogen

4. Atomic hydrogen > nascent hydrogen > molecular hydrogen

Q.

At standard temperature and pressure, hydrogen is a colorless, odorless, and tasteless gas

1. True
2. False

Q. oxidation state of nitrogen in H bond N dative bond C is

Q.

Maximum number of hydrogen bonds per molecule in water is:

1. 1

2. 2

3. 3

4. 4

Q. wrong statement for N2- :1.isoelectronic with CO2 2. structure is lineat 3. both N-N Bond lengths are unequal in hydrogen azide 4 oxidation state for nitrogen is same as in NH2OH

Q. 6.choose an oxidizing substance among the following- •SO2 •H2S •SO3 •HNO2

Q. What is the covalency and what is the covalency of B in B[OH]4 - and its oxidation state.

Q. When dil. $H_{2}S{O}_4$ is electrolysed by using platinum electrodes the gas evolved at cathode is

1. $O_2$
2. $S{O}_2$
3. $S{O}_3$
4. $H_2$

Q. 47. Assertion: In h2so5, oxidation number of S is +6 reason: There is one peroxide linkage in h2so5 a) both assertion and reason are correct and reason explains the assertion b)both assertion and reason are correct but reason does not explain the assertion c)assertion is correct, reason is wrong d)both assertion and reason are wrong.

Q. Which of the following is/are physical property/ies of hydrogen gas?

1. colourless
2. odourless
3. tasteless
4. heavier than air

Q. Match the following according to their similarities with hydrogen.

1. $n{s}^1$ configuration
2. Diatom gas formation
3. $\frac{1}{2}$filled valence shell

Q. 6. Bonding and oxidation state of oxygen in Hydrogen peroxide. Is hydrogen--oxygen bond is ionic in Hydrogen peroxide?

Q. 6. Bonding and oxidation state of oxygen in Hydrogen peroxide. Is hydrogen--oxygen bond is ionic in Hydrogen peroxide?

Q.

1 ) Predict d alkanes obtained by the action of sodium metal on n-propyl chloride & catalytic hydrogenation of isobutylene

2) Write the chemical equation for combustion of propane

Q.

Identify (A), (B), (C), (D) and (E) in the following:

Alkali metal $\left(A\right)+N_2\stackrel{\Delta }{\to }\left(B\right)\stackrel{H_{2}O}{\to }\left(C\right)+\left(D\right)$(C) and (D) both react with HCl, but (D) gives white fumes (E) with HCl..According to above experiment complete the matrix.

Q. How halogens are +m? .due to their high electronegativity they acts as a -m

Q. why do metals like Mg, Zn etc form covalent compounds like in grignards reagent, frankland reagent?

Q. The bond dissociation enthalpy of a hydrogen gas molecule is the least for a single bond between two atoms of any element.

1. True
2. False

Q. The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

Q.

the conversion of PbO₂ to Pb(NO₃)₂ IS

a- oxidation

b- reduction

c- neither oxidation nor reduction

d- both oxidation and reduction

Q. Does hydrogen act as a reducing agent or not?

Q. Balance the following equations by the oxidation number method. (i) Fe2+ + H+ + Cr2O7 2– → Cr3+ + Fe3+ + H2O (ii) MnO2 + C2O4 2– → Mn2+ + CO2